IRON POWDER FOR DUST CORES

The present invention provides iron powder for dust cores that has excellent compressibility and low iron loss after formation. In the iron powder for dust cores, Si content is 0.01 mass % or less, apparent density is 3.8 g/cmor more, the ratio of iron powder particles with a particle size of 45 μm or less is 10 mass % or less, the ratio of iron powder particles with a particle size of over 180 μm and 250 μm or less is less than 30 mass %, the ratio of iron powder particles with a particle size of over 250 μm is 10 mass % or less, and the Vickers hardness (test force: 0.245 N) of a powder cross-section is 80 Hv or less. 1 Si content is 0.01 mass % or less;', {'sup': '3', 'an apparent density is 3.8 g/cmor more;'}, 'a ratio of iron powder particles with a particle size of 45 μm or less is 10 mass % or less;', 'a ratio of iron powder particles with a particle size of over 180 μM and 250 μm or less is less than 30 mass %;', 'a ratio of iron powder particles with a particle size of over 250 μm is 10 mass % or less; and', 'a Vickers hardness (test force: 0.245 N) of a powder cross-section is 80 Hv or less., 'in the pure iron powder,'}. An iron powder for dust cores, comprising pure iron powder obtained by a water atomizing method, wherein The present invention relates to iron powder for dust cores that allows for production of a dust core that has low iron loss and is high density.Magnetic cores used in motors, transformers, and the like are required to have high magnetic flux density and low iron loss. Conventionally, electrical steel sheets have been stacked in such magnetic cores, yet in recent years, dust cores have attracted attention as magnetic core material for motors.The most notable characteristic of a dust core is that a 3D magnetic circuit can be formed. Since electrical steel sheets are stacked to form a magnetic core, the degree of freedom for the shape is limited. A dust core, on the other hand, is formed by pressing soft magnetic particles coated with ...

METHOD FOR PRODUCING ATOMIZED METAL POWDER

... [Problem] To provide a method for producing an atomized metal powder with a high rate of amorphization by water atomization. [Solution] A method for producing an atomized metal powder with an amorphization rate of at least 90% by jetting high pressure water that collides with molten metal that is falling in the vertical direction to fragment the molten metal and form metal powder and cooling said metal powder, wherein: the collision pressure when the high pressure water collides with the molten metal is set to be at least 20 MPa; and the temperature of the molten metal and/or the temperature of the high pressure water is adjusted so that the high pressure water is in a subcritical state or a supercritical state at the surface of collision with the molten metal.

DEVICE FOR EXTRACTING FACILITY NEEDING LIGHTNING COUNTERMEASURES, METHOD FOR EXTRACTING FACILITY NEEDING LIGHTNING COUNTERMEASURES, AND PROGRAM FOR EXTRACTING FACILITY NEEDING LIGHTNING COUNTERMEASURES

The present invention effectively predicts a facility that needs outdoor lightning countermeasures . A facility information analysis unit 121 reads, from a recording unit 110, lightning strike information, lightning damage-caused failure information of facilities at the time of a lightning strike, and facility information, and extracts facility information of a facility that has experienced a lightning damage-caused failure and facility information of a facility that has not experienced a lightning damage-caused failure. A parameter analysis unit 122 parameterizes an item of the extracted facility information which is related to where the lightning damage-caused failure has occurred. A predictive model building unit 131 machine-learns the parameterized facility information and generates a predictive model for outputting a likelihood of a lightning damage-caused failure in a facility upon a lightning strike. A prediction unit 133 inputs facility information to the predictive model and predicts ...

STEEL ALLOY POWDER

Provided is alloyed steel powder having excellent fluidity, formability, and compressibility without containing Ni, Cr, or Si. The alloyed steel powder includes iron-based alloy containing Mo, in which Mo content is 0.4 mass% to 1.8 mass%, a weight-based median size D50 is 40 µm or more, and among particles contained in the alloyed steel powder, those particles having an equivalent circular diameter of 50 µm to 200 µm have a number average of solidity of 0.70 to 0.86, the solidity being defined as (particle cross-sectional area/envelope-inside area).

METHOD FOR MANUFACTURING WATER-ATOMIZED METAL POWDER

Provided is a production method for water-atomized metal powder whose amorphous proportion and apparent density can be increased by a low-cost high-productivity water atomization process even if the metal powder has a high Fe concentration. The production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream having an Fe concentration of 76.0 at% or more and less than 82.9 at% is 100°C or more higher than the melting point, spraying primary cooling water from a plurality of directions at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream of the primary cooling water from one direction among a plurality of the directions and an impact direction on the molten metal stream of the primary cooling water from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature ...

IRON-BASED PRE-ALLOYED POWDER FOR POWDER METALLURGY, DIFFUSION-BONDED POWDER FOR POWDER METALLURGY, IRON-BASED ALLOY POWDER FOR POWDER METALLURGY, AND SINTER-FORGED MEMBER

Provided are an iron-based pre-alloyed powder for powder metallurgy, a diffusion-bonded powder for powder metallurgy, and an iron-based alloy powder for powder metallurgy in which the same is used, it being possible to use these powders to manufacture a sinter-forged member having exceptional strength and workability. The iron-based pre-alloyed powder for powder metallurgy according to an embodiment of the present invention is characterized by containing 0.5-5.0 wt% of Cu and 0.1-0.5 wt% of Mo, the balance being Fe and unavoidable impurities, and the Cu content (Cu%) and the Mo content (Mo%) satisfying relational expression (1). Expression (1): 0.3 × Cu% + 3 × Mo% ≤ 2.7 ...

PARTIAL DIFFUSION ALLOYED STEEL POWDER

Disclosed is a partially diffusion-alloyed steel powder having excellent fluidity, formability, and compressibility without containing Ni, Cr, and Si. A partially diffusion-alloyed steel powder having excellent fluidity, formability, and compressibility that includes an iron-based powder and Mo diffusionally adhered to a surface of the iron-based powder, in which Mo content is 0.2 mass% to 2.0 mass%, a weight-based median diameter D50 is 40 µm or more, and among particles contained in the partially diffusion-alloyed steel powder, those particles having an equivalent circular diameter of 50 µm to 200 µm have a number average of solidity of 0.70 to 0.86, the solidity being defined as (particle cross-sectional area/envelope-inside area).

METHOD FOR PRODUCING SOFT MAGNETIC IRON POWDER

... [Problem] To provide a method for producing soft magnetic iron powder that effectively increases the percentage of amorphousness of the soft magnetic iron powder even when the content of iron triad elements (Fe, Co and Ni) is high. [Solution] Provided is a method for producing soft magnetic iron powder by spraying high pressure water, which impacts a molten metal stream that is falling in the vertical direction, to divide the molten metal stream and form metal powder, and cooling the metal powder to produce the soft magnetic iron powder. When the amount of the molten metal stream that falls per unit time is Qm (kg/min) and the volume of the high pressure water sprayed per unit time is Qaq (kg/min), the mass ratio (Qaq/Qm) is at least 50 and the total content of iron triad components (Fe, Ni, Co) is at least 76 at%.

PARTIAL DIFFUSION ALLOYED STEEL POWDER

Provided is a partial diffusion alloyed steel powder with excellent flowability, moldability, and compressibility without containing Ni, Cr, or Si. Specifically provided is a partial diffusion alloyed steel powder with excellent flowability, moldability, and compressibility which has Mo diffusion-deposited on the surface of an iron-based powder, wherein the Mo content is 0.2-2.0 mass%, the mass median diameter D50 is at least 40 μｍ, and particles with a circle equivalent diameter of 50-200 μｍ among the particles contained in the partial diffusion alloyed steel powder have a number-average degree of area envelopment, which is defined as particle cross-sectional area/area inside envelope, of 0.70-0.86.

MIXED POWDER FOR POWDER METALLURGY, SINTERED BODY, AND METHOD FOR PRODUCING SINTERED BODY

Provided is a mixed powder for powder metallurgy that has higher compressibility than partially diffusion-alloyed steel powder and that makes it possible to obtain high molding density. The mixed powder for powder metallurgy comprises an iron-based powder (a) containing 0-0.2 mass% of Si, 0-0.4 mass% of Mn, and a remainder of Fe and unavoidable impurities and an alloy steel powder (b) containing 2.0-21.0 mass% of Mo, 0-0.2 mass% of Si, 0-0.4 mass% of Mn, and a remainder of Fe and unavoidable impurities. The ratio of the alloy steel powder (b) to the total of the iron-based powder (a) and the alloy steel powder (b) is 50-90 mass%. The ratio of Mo to the total of the iron-based powder (a) and the alloy steel powder (b) is 2.2-6.2 mass%.

METHOD FOR PRODUCING ATOMIZED METAL POWDER

... [Object] Provided is a method for manufacturing atomized metal powder having a high amorphous material fraction by using a water atomizing method. [Solution] A method for manufacturing atomized metal powder in which atomized metal powder having an amorphous material fraction of 90% or more is obtained, the method including ejecting high-pressure water so as to collide with a molten metal stream flowing vertically downward, separating the molten metal stream into metal powder, and cooling the metal powder, in which the high-pressure water collides with the molten metal with a collision pressure of 20 MPa or higher, and in which a temperature of the molten metal and/or a temperature of the high-pressure water are controlled so that the high-pressure water is in a subcritical state or a supercritical state on a collision surface with the molten metal.

METHOD FOR MANUFACTURING WATER-ATOMIZED METAL POWDER

Provided is a method for manufacturing water-atomized metal powder via low-cost, high-productivity water atomization, the method being capable of increasing amorphization and apparent density even for metal powders having a high Fe concentration. In the method for manufacturing water-atomized metal powder: in a region in which the average temperature of a molten metal stream, which has an Fe concentration of at least 76.0 at% and less than 82.9 at%, is at least 100°C higher than the melting point, primary cooling water is sprayed from a plurality of directions; a convergence angle, constituted by the angle between an impact direction of the primary cooling water, with respect to the molten metal stream, from one of the plurality of directions and an impact direction of the primary cooling water, with respect to the molten metal stream, from another one of the directions is 10–25°; and secondary cooling water is sprayed so that the impact pressure thereof with respect the metal powder in ...

STEEL ALLOY POWDER

Provided is a steel alloy powder with excellent flowability, moldability, and compressibility without containing Ni, Cr, or Si. A steel alloy powder made of a Mo-containing iron-based alloy, wherein: the Mo content in the iron-based alloy is 0.4–1.8 mass%; the weight basis median diameter D50 is at least 40 µm; and, with regard to particles with a circle equivalent diameter of 50–200 µm among the particles contained in the steel alloy powder, the number average degree of area envelopment defined as (cross-sectional area of particle/area inside envelope) is 0.70–0.86.

MIXED POWDER FOR POWDER METALLURGY, SINTERED BODY, AND METHOD FOR PRODUCING SINTERED BODY

Provided is a mixed powder for powder metallurgy that has higher compressibility than partially diffusion-alloyed steel powder and that makes it possible to obtain high molding density. The mixed powder for powder metallurgy comprises an iron-based powder (a) containing 0-0.2 mass% of Si, 0-0.4 mass% of Mn, and a remainder of Fe and unavoidable impurities and an alloy steel powder (b) containing 0.3-4.5 mass% of Mo, 0-0.2 mass% of Si, 0-0.4 mass% of Mn, and a remainder of Fe and unavoidable impurities. The ratio of the alloy steel powder (b) to the total of the iron-based powder (a) and the alloy steel powder (b) is 50-90 mass%. The ratio of Mo to the total of the iron-based powder (a) and the alloy steel powder (b) is 0.20 mass% or more but less than 2.20 mass%.

METHOD FOR MANUFACTURING WATER-ATOMIZED METAL POWDER

ALLOY STEEL POWDER FOR POWDER METALLURGY, AND SINTERED BODY

An Fe—Mo—Cu—C-based alloy steel powder for powder metallurgy has a chemical composition containing Mo: 0.2 mass % to 1.5 mass %, Cu: 0.5 mass % to 4.0 mass %, and C: 0.1 mass % to 1.0 mass %, with a balance being Fe and incidental impurities, wherein an iron-based powder has a mean particle size of 30 μm to 120 μm, and a Cu powder has a mean particle size of 25 μm or less. Despite the alloy steel powder for powder metallurgy having a chemical composition not containing Ni, a part produced by sintering a press formed part of the powder and further carburizing-quenching-tempering the sintered part has mechanical properties of at least as high tensile strength, toughness, and sintered density as a Ni-added part.

A PRE-ALLOYED WATER ATOMIZED STEEL POWDER

Method for manufacturing soft magnetic iron powder

A method for manufacturing soft magnetic iron powder, the method including ejecting high-pressure water to collide with a molten metal stream falling vertically downward, breaking up the molten metal stream into metal powder, and cooling the metal powder, in which, when a falling rate of the molten metal stream per unit time is defined as Qm (kg/min) and an ejection rate of high-pressure water per unit time is defined as Qaq (kg/min), a mass ratio (Qaq/Qm) is 50 or more, and a total content of ferrous constituents (Fe, Ni, and Co) is 76 at % or more.

IRON POWDER FOR IRON POWDER CORES AND METHOD FOR SELECTING IRON POWDER FOR IRON POWDER CORES

Provided is an iron powder for iron powder cores, and a method for selecting the same. The following powder is an iron powder in which orientations are measured in a cross section of a compact formed with a molding pressure of 0.98 GN/mby electron backscatter diffraction (EBSD) and the average of KAMs calculated using EBSD analysis software is to 3.00° or less. The Iron powder has a particle size distribution in which particles with a size of 45 μm or less are adjusted to 10% by mass or less, in which the average hardness of powder particles is 80 HV 0.025 or less in Vickers hardness, in which the product of the number (inclusions/m) of inclusions per unit area and the median size D50 (m) of the inclusions is 10,000 (inclusions/m) or less, and which has an apparent density of 4.0 Mg/mor more. 1. An iron powder for iron powder cores , wherein orientations are measured in a cross section of a compact formed with a molding pressure of 0.98 GN/mby electron backscatter diffraction and an average of Kernel Average Misorientations calculated from measurement results of the orientations using electron backscatter diffraction analysis software is 3.00° or less.2. The Iron powder for iron powder cores according to claim 1 , 'an average hardness is 80 HV 0.025 or less in Vickers hardness,', 'wherein the iron powder contains 10% by mass or less of particles with a size of 45 μm or less,'}{'sup': '2', 'a product of the number (inclusions/m) of inclusions per unit area and the median size D50 (m) of the Inclusions is 10,000 (inclusions/m) or less, and'}{'sup': '3', 'apparent density is 4.0 Mg/mor more.'}3. The iron powder for iron powder cores according to claim 1 , wherein the iron powder contains 0.01% or less Al claim 1 , 0.01% or less Si claim 1 , 0.1% or less Mn claim 1 , and 0.05% or less Cr on a mass basis claim 1 , the remainder being Fe and inevitable impurities.4. The iron powder for iron powder cores according to claim 2 , wherein the iron powder contains 0.01% or less ...

FUSE HAVING FREQUENCY SEPARATION FUNCTION

A fuse () with a frequency separation function includes an input port portion (), an output port portion (), a first transmitting portion () which is provided between the input port portion and the output port portion, the first transmitting portion () configured to transmit a lightning surge current entering the input port portion and guide the lightning surge current to the output port portion, a second transmitting portion () which is provided between the input port portion and the output port portion, the second transmitting portion configured to be capable of transmitting a normal current and an abnormal current entering the input port portion, and a melting mechanism portion (-) which is provided between the second transmitting portion and the input port portion or between the second transmitting portion and the output port portion, the melting mechanism configured not to melt and break when the normal current passes, and configured to melt and break when the abnormal current passes. 1. A fuse with a frequency separation function , the fuse comprising:an input port portion which is an input terminal of a normal current that does not exceed a predetermined amount of current, an abnormal current that exceeds the predetermined amount of current, and a lightning surge current;an output port portion which is an output terminal of the normal current, the abnormal current, and the lightning surge current;a first transmitting portion provided between the input port portion and the output port portion, the first transmitting portion configured to transmit the lightning surge current entering the input port portion and guide the lightning surge current to the output port portion;a second transmitting portion provided between the input port portion and the output port portion, the second transmitting portion configured to be capable of transmitting the normal current and the abnormal current that enter the input port portion; anda melting mechanism portion provided ...

METHOD OF MANUFACTURING SOFT MAGNETIC DUST CORE

Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K; and heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied. 1. A method of manufacturing a soft magnetic dust core comprising:{'sub': x1', 'x2, 'preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder;'}{'sub': 'x1', 'applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K;'}{'sub': x1', 'x2, 'heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied; and'}thereby producing a soft magnetic dust core having a green density of 78% or more, a crystallization degree of 40% or more, and α-Fe crystallites with a size of 50 nm or less.2. The method of manufacturing a soft magnetic dust core claim 1 , according to claim 1 , wherein the amorphous powder has a composition containing claim 1 , in atomic percent:Fe: 79% or more and 86% or less;B: 4% or more and 13% or less;Si: 0% or more and 8% or less;P: 1% or more and 14% or less;C: 0% or more and 5% or ...

LIGHTING DAMAGE PREDICTION DEVICE, METHOD, AND PROGRAM

A lightning damage prediction apparatus that predicts a risk of a failure of access equipment due to a lightning strike is provided. A regression equation representing a relationship between a lightning strike density for each section in a prediction target area, an equipment density for each section of components of a plurality of types constituting equipment, and a lightning damage failure density for each section of the equipment or the component, corresponding to a first period in the past, is generated, and a lightning damage failure density for each section of a prediction target area corresponding to a second period is predicted on the basis of a lightning strike density and an equipment density for each section in the prediction target area corresponding to the second period that is a prediction target, and the regression equation. 1. A lightning damage prediction apparatus for acquiring data from , a lightning strike data storage unit that stores lightning strike data including a position of occurrence of a lightning strike and a date and time of occurrence; an equipment data storage unit that stores equipment data representing a property of each of a plurality of types of components constituting equipment; a failure data storage unit that stores failure data representing a history of failures having occurred in the equipment or each of the components of the equipment due to the lightning strike; and a section data storage unit that stores section data including positional information of each of a plurality of sections obtained by dividing a prediction target area , the lightning damage prediction apparatus comprising:a processor; and generate a regression equation representing a relationship between a lightning damage failure density for each section in the prediction target area corresponding to a first period and a lightning strike density and an equipment density based on the failure data and the section data using, as variables, the lightning strike ...

Iron-based prealloy powder, iron-based diffusion-bonded powder, and iron-based alloy powder for powder metallurgy using the same

The present disclosure relates to an iron-based prealloy powder having excellent strength and processability, and an iron-based alloy powder for powder metallurgy and a sinter-forged member using the same. The iron-based prealloy powder for powder metallurgy according to an embodiment of the present disclosure includes 0.5 to 5.0 wt % of Cu, 0.1 to 0.5 wt % of Mo, and a balance of Fe and other inevitable impurities. A Cu content (Cu %) and a Mo content (Mo %) satisfy the following Relational Equation (1): 0.3×Cu %+3×Mo %≤2.7  (1).

METHOD FOR PRODUCING WATER-ATOMIZED METAL POWDER

A method for producing a water-atomized metal powder, comprising applying water to a molten metal stream, dividing the molten metal stream into a metal powder, and cooling the metal powder, wherein the metal powder is further subjected to secondary cooling with cooling capacity having a minimum heat flux point (MHF point) higher than the surface temperature of the metal powder in addition to the cooling and the secondary cooling is performed from a temperature range where the temperature of the metal powder after the cooling is not lower than the cooling start temperature necessary for amorphization nor higher than the minimum heat flux point (MHF point). 1. A method for producing a water-atomized metal powder , comprising applying water to a molten metal stream , dividing the molten metal stream into a metal powder , and cooling the metal powder , wherein the metal powder is further subjected to secondary cooling with cooling capacity having a minimum heat flux point (MHF point) higher than the surface temperature of the metal powder in addition to the cooling and the secondary cooling is performed from a temperature range where the temperature of the metal powder after the cooling is not lower than the cooling start temperature necessary for amorphization nor higher than the minimum heat flux point (MHF point).2. The method for producing the water-atomized metal powder according to claim 1 , wherein the secondary cooling is cooling in which water ejection is performed using water different from water used to divide the molten metal stream.3. The method for producing the water-atomized metal powder according to claim 2 , wherein the cooling in which whereby water ejection is performed is cooling in which jet water with a temperature of 10° C. or lower and an ejection pressure of 5 MPa or higher is used.4. The method for producing the water-atomized metal powder according to claim 1 , wherein the secondary cooling is cooling by using a container placed on the fall ...

DEVICE FOR EXTRACTING FACILITY NEEDING LIGHTNING COUNTERMEASURES, METHOD FOR EXTRACTING FACTILITY NEEDING LIGHTNING COUNTERMEASURES, AND PROGRAM FOR EXTRACTING FACILITY NEEDING LIGHTNING COUNTERMEASURES

Outdoor lightning countermeasure requiring facilities are effectively predicted. A facility information analysis unit reads lightning strike information, lightning damage failure information on facilities when lightning strikes, and facility information from a recording unit to extract facility information on facilities in which a lightning damage failure has occurred and facility information on facilities in which a lightning damage failure has not occurred. A parameter analysis unit parameterizes items associated with the spots of the extracted facility information in which a lightning damage failure has occurred. A prediction model construction unit performs the machine learning of the parameterized facility information to generate a prediction model that outputs the possibilities of the occurrence of a lightning damage failure in facilities when lightning strikes. A prediction unit inputs the facility information to the prediction model to predict facilities in which a lightning damage failure is likely to occur when lightning strikes. 1. A lightning countermeasure requiring facility extraction device comprising: a parameter extraction unit , including one or more processors , configured to extract facility information on facilities in which a lightning damage failure has occurred and facility information on facilities in which a lightning damage failure has not occurred when lightning strikes from lightning strike information , lightning damage failure information on facilities when lightning strikes , and facility information on the facilities; a machine learning unit , including one or more processors , configured to perform machine learning of the extracted facility information and generates a prediction model that , upon receiving facility information on facilities , outputs possibilities of occurrence of a lightning damage failure in the facilities when lightning strikes; and a prediction unit , including one or more processors , configured to input ...

PARTIALLY DIFFUSION-ALLOYED STEEL POWDER

Disclosed is a partially diffusion-alloyed steel powder having excellent fluidity, formability, and compressibility without containing Ni, Cr, and Si. A partially diffusion-alloyed steel powder having excellent fluidity, formability, and compressibility that includes an iron-based powder and Mo diffusionally adhered to a surface of the iron-based powder, in which Mo content is 0.2 mass % to 2.0 mass %, a weight-based median diameter D50 is 40 μm or more, and among particles contained in the partially diffusion-alloyed steel powder, those particles having an equivalent circular diameter of 50 μm to 200 μm have a number average of solidity of 0.70 to 0.86, the solidity being defined as (particle cross-sectional area/envelope-inside area). 1. A partially diffusion-alloyed steel powder comprising an iron-based powder and Mo diffusionally adhered to a surface of the iron-based powder , whereinMo content is 0.2 mass % to 2.0 mass %,a weight-based median size D50 is 40 μm or more, andamong particles contained in the partially diffusion-alloyed steel powder, those particles having an equivalent circular diameter of 50 μm to 200 μm have a number average of solidity of 0.70 to 0.86, the solidity being defined as (particle cross-sectional area/envelope-inside area).2. The partially diffusion-alloyed steel powder according to claim 1 , wherein Ni claim 1 , Cr claim 1 , and Si contents are each 0.1 mass % or less.3. The partially diffusion-alloyed steel powder according to claim 1 , wherein the iron-based powder contains at least one selected from the group consisting of Cu claim 1 , Mo claim 1 , and Mn in a pre-alloyed manner.4. The partially diffusion-alloyed steel powder according to claim 2 , wherein the iron-based powder contains at least one selected from the group consisting of Cu claim 2 , Mo claim 2 , and Mn in a pre-alloyed manner. This disclosure relates to a partially diffusion-alloyed steel powder and, in particular, to a partially diffusion-alloyed steel powder ...

Method of producing atomized metal powder

A water-atomized metal powder is produced by dividing a molten metal stream into a metal powder by making injection water having a liquid temperature of 10° C. or less and an injection pressure of 5 MPa or more impinge on the molten metal stream and cooling the metal powder. Cooling with injection water having a liquid temperature of 10° C. or less and an injection pressure of 5 MPa or more enables can be performed not in the film boiling region but in the transition boiling region from the beginning of cooling. A gas-atomized metal powder may also be produced by dividing a molten metal stream into a metal powder by making an inert gas impinge on the molten metal stream and cooling the metal powder with injection water having a liquid temperature of 10° C. or less and an injection pressure of 5 MPa or more.

ALLOYED STEEL POWDER

Provided is alloyed steel powder having excellent fluidity, formability, and compressibility without containing Ni, Cr, or Si. The alloyed steel powder includes iron-based alloy containing Mo, in which Mo content is 0.4 mass % to 1.8 mass %, a weight-based median size D50 is 40 μm or more, and among particles contained in the alloyed steel powder, those particles having an equivalent circular diameter of 50 μm to 200 μm have a number average of solidity of 0.70 to 0.86, the solidity being defined as (particle cross-sectional area/envelope-inside area). 1. An alloyed steel powder comprising iron-based alloy containing Mo , whereinMo content is 0.4 mass % to 1.8 mass %,a weight-based median size D50 is 40 μm or more, andamong particles contained in the alloyed steel powder, those particles having an equivalent circular diameter of 50 μm to 200 μm have a number average of solidity of 0.70 to 0.86, the solidity being defined as (particle cross-sectional area/envelope-inside area).2. The alloyed steel powder according to claim 1 , wherein the iron-based alloy contains Ni claim 1 , Cr claim 1 , and Si each in an amount of 0.1 mass % or less.3. The alloyed steel powder according to claim 1 , wherein the iron-based alloy contains one or both of Cu and Mn.4. The alloyed steel powder according to claim 2 , wherein the iron-based alloy contains one or both of Cu and Mn. This disclosure relates to an alloyed steel powder and, in particular, to an alloyed steel powder having excellent fluidity, formability, and compressibility without containing Ni, Cr, and Si.Powder metallurgical techniques enable manufacture of complicated-shape parts with dimensions very close to the products' shapes (i.e. near net shapes) and with high dimensional accuracy. The use of powder metallurgical techniques in manufacturing parts therefore can significantly reduce machining costs. For this reason, powder metallurgical products manufactured by powder metallurgical techniques have been used as various ...

METHOD OF MANUFACTURING SOFT MAGNETIC DUST CORE AND SOFT MAGNETIC DUST CORE

Provided is a soft magnetic dust core having high density and favorable properties. A method of manufacturing a soft magnetic dust core includes: preparing coated powder including amorphous powder made of an Fe—B—Si—P—C—Cu-based alloy, an Fe—B—P—C—Cu-based alloy, an Fe—B—Si—P—Cu-based alloy, or an Fe—B—P—Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K; and heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied. 113-. (canceled)14. A method of manufacturing a soft magnetic dust core comprising:{'sub': x1', 'x2, 'preparing coated powder including amorphous powder made of an Fe—B—Si—P—C—Cu-based alloy, an Fe—B—P—C—Cu-based alloy, an Fe—B—Si—P—Cu-based alloy, or an Fe—B—P—Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder;'}{'sub': 'x1', 'applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K; and'}{'sub': x1', 'x2, 'heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied.'}15. The method of manufacturing a soft magnetic dust core claim 14 , according to claim 14 , wherein the amorphous powder has a composition containing claim 14 , in atomic percent:Fe: 79% or more and 86% or less;B: 4% or more and 13% or less;Si: 0% or more and 8% or less;P: 1% or more and 14% or less;C: 0% or more and 5% or less;Cu: 0.4% or more and 1.4% or less; andincidental impurities.16. The method of ...

IRON-BASED SINTERED BODY AND METHOD OF MANUFACTURING THE SAME

Provided is an iron-based sintered body having excellent mechanical properties. In the sintered body, the area fraction of pores is 15% or less and the area-based median size D50 of the pores is 20 82 m or less. 19.-. (canceled)10. An iron-based sintered body , comprising an area fraction of pores in the iron-based sintered body of 15% or less , and an area-based median size D50 of the pores of 20 μm or less.11. The iron-based sintered body according to claim 10 , comprising Mo claim 10 , Cu claim 10 , and C.12. The iron-based sintered body according to claim 11 , comprising Mo in an amount of 0.2 mass % to 1.5 mass % claim 11 , Cu in an amount of 0.5 mass % to 4.0 mass % claim 11 , and C in an amount of 0.1 mass % to 1.0 mass %.13. The iron-based sintered body according to claim 10 , wherein the iron-based sintered body has been carburized claim 10 , quenched claim 10 , and tempered.14. The iron-based sintered body according to claim 11 , wherein the iron-based sintered body has been carburized claim 11 , quenched claim 11 , and tempered.15. The iron-based sintered body according to claim 12 , wherein the iron-based sintered body has been carburized claim 12 , quenched claim 12 , and tempered.16. A method of manufacturing an iron-based sintered body claim 12 , the method comprising:compacting (i) partially diffusion alloyed steel powder in which Mo is adhered to the surface of particles of iron-based powder by diffusion bonding with (ii) mixed powder for powder metallurgy obtained by mixing at least Cu powder and graphite powder at a pressure of 400 MPa or more to obtain a compact; andthen sintering the obtained compact at 1000° C. or higher for 10 min or more.17. The method of manufacturing a high strength according to claim 16 , the method further comprising carburizing claim 16 , quenching claim 16 , and tempering after sintering the obtained compact.18. The method of manufacturing an iron-based sintered body claim 16 , according to claim 16 , wherein the mixed ...

Mixed powder for powder metallurgy, sintered body, and method of manufacturing sintered body

Provided is a mixed powder for powder metallurgy having a chemical system not using Ni which causes non-uniform metallic microstructure in a sintered body. A mixed powder for powder metallurgy comprises: a partially diffusion alloyed steel powder in which Mo diffusionally adheres to a particle surface of an iron-based powder; a Cu powder; and a graphite powder, wherein the mixed powder for powder metallurgy has a chemical composition containing Mo: 0.2 mass % to 1.5 mass %, Cu: 0.5 mass % to 4.0 mass %, and C: 0.1 mass % to 1.0 mass %, with the balance consisting of Fe and inevitable impurities, and the partially diffusion alloyed steel powder has: a mean particle diameter of 30 μm to 120 μm; a specific surface area of less than 0.10 m 2 /g; and a circularity of particles with a diameter in a range from 50 μm to 100 μm of 0.65 or less.

METHOD OF PRODUCING MIXED POWDER FOR POWDER METALLURGY, METHOD OF PRODUCING SINTERED BODY, AND SINTERED BODY

A method of producing a mixed powder for powder metallurgy comprises: mixing an iron-based powder with a Mo-containing powder and a Cu-containing powder, to obtain a raw material mixed powder; heat-treating the raw material mixed powder to cause Mo and Cu to diffusionally adhere to a surface of the iron-based powder, to obtain a partially diffusion-alloyed steel powder; and mixing the partially diffusion-alloyed steel powder with a graphite powder, to obtain a mixed powder for powder metallurgy, wherein the iron-based powder has an average particle size of 30 μm to 120 μm, a cuprous oxide powder is used as the Cu-containing powder, and the mixed powder for powder metallurgy has a chemical composition containing Mo: 0.2 mass % to 1.5 mass %, Cu: 0.5 mass % to 4.0 mass %, and C: 0.1 mass % to 1.0 mass %, with a balance being Fe and incidental impurities. 1. A method of producing a mixed powder for powder metallurgy , the method comprising:mixing an iron-based powder with a Mo-containing powder and a Cu-containing powder, to obtain a raw material mixed powder;heat-treating the raw material mixed powder to cause Mo and Cu to diffusionally adhere to a surface of the iron-based powder, to obtain a partially diffusion-alloyed steel powder; andmixing the partially diffusion-alloyed steel powder with a graphite powder, to obtain a mixed powder for powder metallurgy,wherein the iron-based powder has an average particle size of 30 μm to 120 μm,a cuprous oxide powder is used as the Cu-containing powder, andthe mixed powder for powder metallurgy has a chemical composition containing Mo: 0.2 mass % to 1.5 mass %, Cu: 0.5 mass % to 4.0 mass %, and C: 0.1 mass % to 1.0 mass %, with a balance being Fe and incidental impurities.2. The method of producing a mixed powder for powder metallurgy according to claim 1 ,wherein the Cu-containing powder has an average particle size of 5 μm or less.3. A method of producing a sintered body claim 1 , the method comprising:{'claim-ref': {'@idref ...

REDUCED IRON POWDER AND METHOD FOR PREPARING SAME AND BEARING

Reduced iron powder that has fewer coarse inclusions, has excellent formability, has high porosity after sintering, has excellent reactivity per unit mass, and can be effectively used as reaction material even to the particle inside is provided. Reduced iron powder has an apparent density of 1.00 Mg/mto 1.40 Mg/m. 1. Reduced iron powder having an apparent density of 1.00 Mg/mto 1.40 Mg/m.2. The reduced iron powder according to claim 1 , having an amount of oxygen of 0.38 mass % or less.3. The reduced iron powder according to claim 1 , having a specific surface area of 0.20 m/g or more.4. A method for preparing reduced iron powder claim 1 , for use in preparing the reduced iron powder according to claim 1 , comprising:agglomerating precursor iron oxide powder whose mean particle size measured by a laser diffraction method is 3.0 μm or less to obtain iron oxide powder; andthereafter reducing the iron oxide powder at 800° C. to 1000° C. with hydrogen to obtain the reduced iron powder.5. The method for preparing reduced iron powder according to claim 4 , comprisingclassifying and selecting the iron oxide powder so that its mean particle size measured by the laser diffraction method is 50 μm to 200 μm, before the reduction of the iron oxide powder.6. The method for preparing reduced iron powder according to claim 4 ,wherein the iron oxide powder has an iron content of 68.8 mass % or more.7. A bearing produced from the reduced iron powder according to as a raw material.8. A bearing produced from the reduced iron powder according to as a raw material.9. A bearing produced from the reduced iron powder according to as a raw material. The disclosure relates to reduced iron powder, a method for preparing the same, and a bearing produced from the reduced iron powder.Two main types of iron powder based on its preparation method are typically known: reduced iron powder; and atomized iron powder. The apparent density of iron powder currently known is 2.3 Mg/mor more in reduced ...

RAW MATERIAL POWDER FOR SOFT MAGNETIC POWDER, AND SOFT MAGNETIC POWDER FOR DUST CORE

Soft magnetic powder for dust cores that yields dust cores having low eddy current loss is provided. Raw material powder for soft magnetic powder comprises Fe: 60 mass % or more, a γ-phase stabilizing element, and an electric resistance-increasing element: 1.0 mass % or more. 1. Raw material powder for soft magnetic powder , comprisingFe: 60 mass % or more,a γ-phase stabilizing element, andan electric resistance-increasing element: 1.0 mass % or more.2. The raw material powder for soft magnetic powder according to claim 1 ,wherein the γ-phase stabilizing element is one or more selected from the group consisting of Ni, Mn, Cu, C, and N.3. The raw material powder for soft magnetic powder according to claim 1 ,wherein the electric resistance-increasing element is one or more selected from the group consisting of Si, Al, and Cr.4. The raw material powder for soft magnetic powder according to claim 1 ,wherein the γ-phase stabilizing element is Ni: 1.5 mass % to 20 mass %, andthe electric resistance-increasing element is Si: 1.0 mass % to 6.5 mass %.5. Soft magnetic powder for dust cores claim 1 , comprisingFe: 60 mass % or more,a γ-phase stabilizing element, andan electric resistance-increasing element: 1.0 mass % or more,wherein a concentration of the electric resistance-increasing element in a center part of a particle constituting the soft magnetic powder for dust cores is 1.0 mass % or more, andthe concentration of the electric resistance-increasing element in a surface layer of the particle constituting the soft magnetic powder for dust cores is higher than the concentration of the electric resistance-increasing element in the center part of the particle constituting the soft magnetic powder for dust cores.6. The raw material powder for soft magnetic powder according to claim 2 ,wherein the electric resistance-increasing element is one or more selected from the group consisting of Si, Al, and Cr. The disclosure relates to soft magnetic powder for dust cores having ...

PRODUCTION METHOD FOR WATER-ATOMIZED METAL POWDER

A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream having an Fe concentration of 76.0 at % or more and less than 82.9 at % is 100° C. or more higher than the melting point, spraying primary cooling water at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream from one direction and an impact direction on the molten metal stream from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+100° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more. 1. A production method for water-atomized metal powder , comprising:spraying primary cooling water that is to impact on a vertically falling molten metal stream to divide the molten metal stream into metal powder and to cool the metal powder, thereby producing water-atomized metal powder having a total content of iron-group components (Fe, Ni, Co) in atomic percent of 76.0 at % or more and less than 82.9 at % and an amorphous proportion of 95% or more, wherein:in a region in which an average temperature of the molten metal stream is 100° C. or more higher than a melting point, the primary cooling water is sprayed from a plurality of directions to cause the primary cooling water to impact on a guide having a slanting surface that slants toward the molten metal stream and to move the primary cooling water along the slanting surface, thereby adjusting a convergence angle to 10° to 25°, the convergence angle being an angle between an impact direction on the molten metal stream of the primary cooling water from one direction among a plurality of the directions and an impact direction on the molten metal stream of the primary cooling water ...

METHOD FOR MANUFACTURING ATOMIZED METAL POWDER

[Object] Provided is a method for manufacturing atomized metal powder having a high amorphous material fraction by using a water atomizing method. 1. A method for manufacturing atomized metal powder in which atomized metal powder having an amorphous material fraction of 90% or more is obtained , the method comprising ejecting high-pressure water so as to collide with a molten metal stream flowing vertically downward , separating the molten metal stream into metal powder , and cooling the metal powder ,wherein the high-pressure water collides with the molten metal with a collision pressure of 20 MPa or higher, andwherein a temperature of the molten metal and/or a temperature of the high-pressure water are controlled so that the high-pressure water is in a subcritical state or a supercritical state on a collision surface with the molten metal.2. The method for manufacturing atomized metal powder according to claim 1 , wherein an average temperature of the molten metal and the high-pressure water is 374° C. or higher at a time of collision between the high-pressure water and the molten metal.3. The method for manufacturing atomized metal powder according to claim 1 , wherein claim 1 , when a flow rate of the molten metal stream per unit time is defined as Qm (kg/min) and an ejection rate of the high-pressure water per unit time is defined as Qaq (kg/min) claim 1 , a mass ratio (Qaq/Qm) is 35 or more.4. The method for manufacturing atomized metal powder according to wherein claim 2 , when a flow rate of the molten metal stream per unit time is defined as Qm (kg/min) and an ejection rate of the high-pressure water per unit time is defined as Qaq (kg/min) claim 2 , a mass ratio (Qaq/Qm) is 35 or more.5. The method for manufacturing atomized metal powder according to claim 1 , wherein the atomized metal powder contains iron-group constituents (Fe claim 1 , Ni claim 1 , and Co) in a total amount of 76.0 at % or more in terms of atomic fraction and Cu in an amount of 0.1 at ...

IRON-BASED ALLOY POWDER FOR POWDER METALLURGY, AND SINTER-FORGED MEMBER

An iron-based alloy powder for powder metallurgy contains 2.0 mass % to 5.0 mass % of Cu, the balance being Fe and incidental impurities. From 1/10 to 8/10 of the Cu is diffusion bonded in powder-form to the surfaces of iron powder that serves as a raw material for the iron-based alloy powder, and the remainder of the Cu is contained in this iron powder as a pre-alloy. The iron-based alloy powder has superior compressibility to conventional Cu pre-alloyed iron-based alloy powders and enables production of a high strength sinter-forged member even when sintered at a lower temperature than conventional iron-based alloy powders containing mixed Cu powder. 1. An iron-based alloy powder for powder metallurgy in which Cu is diffusion bonded in powder-form to surfaces of raw material iron powder pre-alloyed with Cu , the iron-based alloy powder comprising2.0 mass % to 5.0 mass % of Cu, the balance being Fe and incidental impurities, wherein1/10 to 8/10 of the Cu is diffusion bonded to the surfaces of the raw material iron powder and the remainder of the Cu is pre-alloyed.2. A sinter-forged member having the iron-based alloy powder of as a precursor. This disclosure relates to an iron-based alloy powder that is a precursor powder for a powder metallurgical product, and to a sinter-forged member produced by sinter-forging using the iron-based alloy powder as a precursor.Among powder metallurgical products, sinter-forged products, in particular, are used as members that are required to have especially high strength, such as connecting rods for automobile engines.Iron-based alloy powders of an Fe—Cu—C type in which Cu powder and graphite powder are mixed with pure iron powder are commonly used as precursor powders for sinter-forged products (PTL 1 to 4). A machinability enhancer such as MnS may also be added to a precursor powder to enhance machinability (PTL 1, 4, and 5).In recent years, there has been demand for even higher strength materials for connecting rod applications ...

IRON POWDER FOR DUST CORE

An iron powder for dust cores has an apparent density is 3.8 g/cmor more, a mean particle size (D50) is 80 μm or more, 60% or more of powder with a powder particle size of 100 μm or more has a mean grain size of 80 μm or more inside the powder particle, an area ratio of inclusions to a matrix phase of the powder is 0.4% or less, and a micro Vickers hardness (testing force: 0.245 N) of a powder cross-section is 90 Hv or less. It is thus possible to obtain iron powder for dust cores in order to manufacture a dust core that has low hysteresis loss even after the iron powder is formed and subjected to strain relief annealing. 1. An iron powder for dust cores comprising iron as a principal component , wherein the iron powder has an apparent density of 3.8 g/cmor more and a mean particle size (D50) of 80 μm or more , 60% or more of powder with a powder particle size of 100 μm or more has a mean grain size of 80 μm or more inside the powder particle , an area ratio of an inclusion to a matrix phase of the powder is 0.4% or less , and a micro Vickers hardness (testing force: 0.245 N) of a powder cross-section is 90 Hv or less.2. The iron powder for dust cores of claim 1 , wherein 70% or more of the powder with the powder particle size of 100 μm or more has the mean grain size of 80 μm or more inside the powder particle. This disclosure relates to iron powder for dust cores in order to manufacture a dust core that has a coarse grain size and low hysteresis loss even after formation and strain relief annealing.Magnetic cores used in motors, transformers, and the like are required to have high magnetic flux density and low iron loss. Conventionally, electrical steel sheets have been stacked in such magnetic cores, yet in recent years, dust cores have attracted attention as magnetic core material for motors.The most notable characteristic of a dust core is that a 3D magnetic circuit can be formed. Since electrical steel sheets are stacked to form a magnetic core, the degree of ...

IRON POWDER FOR DUST CORE AND INSULATION-COATED IRON POWDER FOR DUST CORE

Iron powder for dust cores that is appropriate for manufacturing a dust core with low iron loss is obtained by setting the oxygen content in the powder to be 0.05 mass % or more to 0.20 mass % or less, and in a cross-section of the powder, setting the area ratio of inclusions to the matrix phase to be 0.4% or less. 1. Iron powder for dust cores comprising iron powder obtained by an atomizing method containing iron as a principal component , wherein an oxygen content in the powder is 0.05 mass % or more and 0.20 mass % or less , and in a cross-section of the powder , an area ratio of an inclusion to a matrix phase is 0.4% or less.2. Insulation-coated iron powder for dust cores comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the iron powder for dust cores of , and an insulation coating applied thereto.'}3. The insulation-coated iron powder for dust cores of claim 2 , wherein a rate of addition of the insulation coating with respect to the iron powder for dust cores is 0.1 mass % or more.4. The insulation-coated iron powder for dust cores of claim 2 , wherein the insulation coating is silicone resin.5. The insulation-coated iron powder for dust cores of claim 3 , wherein the insulation coating is silicone resin. This disclosure relates to iron powder for dust cores and insulation-coated iron powder for dust cores that yield dust cores with excellent magnetic properties.Magnetic cores used in motors, transformers, and the like are required to have high magnetic flux density and low iron loss. Conventionally, electrical steel sheets have been stacked in such magnetic cores, yet in recent years, dust cores have attracted attention as magnetic core material for motors.The most notable characteristic of a dust core is that a 3D magnetic circuit can be formed. Since electrical steel sheets are stacked to form a magnetic core, the degree of freedom for the shape is limited. A dust core, on the other hand, is formed by pressing soft magnetic particles coated with ...

MIXED POWDER FOR POWDER METALLURGY, SINTERED BODY, AND METHOD FOR PRODUCING SINTERED BODY

Disclosed is a mixed powder for powder metallurgy including: (a) an iron-based powder containing Si in an amount of 0 mass % to 0.2 mass % and Mn in an amount of 0 mass % to 0.4 mass %, with the balance being Fe and inevitable impurities; and (b) an alloyed steel powder containing Mo in an amount of 2.0 mass % to 21.0 mass %, Si in an amount of 0 mass % to 0.2 mass %, and Mn in an amount of 0 mass % to 0.4 mass %, with the balance being Fe and inevitable impurities, wherein a ratio of (b) the alloyed steel powder to a total of (a) the iron-based powder and (b) the alloyed steel powder is from 50 mass % to 90 mass %, and a ratio of Mo to the total of (a) the iron-based powder and (b) the alloyed steel powder is from 2.2 mass % to 6.2 mass %. 1. A mixed powder for powder metallurgy comprising:(a) an iron-based powder containing Si in an amount of 0 mass % to 0.2 mass % and Mn in an amount of 0 mass % to 0.4 mass %, with the balance being Fe and inevitable impurities; and(b) an alloyed steel powder containing Mo in an amount of 2.0 mass % to 21.0 mass %, Si in an amount of 0 mass % to 0.2 mass %, and Mn in an amount of 0 mass % to 0.4 mass %, with the balance being Fe and inevitable impurities, whereina ratio of (b) the alloyed steel powder to a total of (a) the iron-based powder and (b) the alloyed steel powder is from 50 mass % to 90 mass %, anda ratio of Mo to the total of (a) the iron-based powder and (b) the alloyed steel powder is from 2.2 mass % to 6.2 mass %.2. The mixed powder for powder metallurgy according to claim 1 , further comprising:(c) a Cu powder; and(d) a graphite powder, whereina ratio of (c) the Cu powder to a total of (a) the iron-based powder, (b) the alloyed steel powder, (c) the Cu powder, and (d) the graphite powder is from 0.5 mass % to 4.0 mass %, anda ratio of (d) the graphite powder to the total of (a) the iron-based powder, (b) the alloyed steel powder, (c) the Cu powder, and (d) the graphite powder is from 0.2 mass % to 1.0 mass %.3. The ...

METHOD OF MANUFACTURING SOFT MAGNETIC DUST CORE AND SOFT MAGNETIC DUST CORE

Provided is a soft magnetic dust core having high density and favorable properties. A method of manufacturing a soft magnetic dust core includes: preparing coated powder including amorphous powder made of an Fe—B—Si—P—C—Cu-based alloy, an Fe—B—P—C—Cu-based alloy, an Fe—B—Si—P—Cu-based alloy, or an Fe—B—P—Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K; and heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied. 113-. (canceled)14. A method of manufacturing a soft magnetic dust core comprising:{'sub': x1', 'x2, 'preparing coated powder including amorphous powder made of an Fe—B—Si—P—C—Cu-based alloy, an Fe—B—P—C—Cu-based alloy, an Fe—B—Si—P—Cu-based alloy, or an Fe—B—P—Cu-based alloy, with a first initial crystallization temperature Tand a second initial crystallization temperature T; and a coating formed on a surface of particles of the amorphous powder;'}{'sub': 'x1', 'applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T−100 K; and'}{'sub': x1', 'x2, 'heating to a maximum end-point temperature equal to or higher than T−50 K and lower than Twith the compacting pressure being applied.'}15. The method of manufacturing a soft magnetic dust core claim 14 , according to claim 14 , wherein the amorphous powder has a composition containing claim 14 , in atomic percent:Fe: 79% or more and 86% or less;B: 4% or more and 13% or less;Si: 0% or more and 8% or less;P: 1% or more and 14% or less;C: 0% or more and 5% or less;Cu: 0.4% or more and 1.4% or less; andincidental impurities.16. The method of ...

Mixed powder for powder metallurgy, sintered body, and method for producing sintered body

Disclosed is a mixed powder for powder metallurgy including: (a) an iron-based powder containing Si in an amount of 0 mass % to 0.2 mass % and Mn in an amount of 0 mass % to 0.4 mass %, with the balance being Fe and inevitable impurities; and (b) an alloyed steel powder containing Mo in an amount of 0.3 mass % to 4.5 mass %, Si in an amount of 0 mass % to 0.2 mass %, and Mn in an amount of 0 mass % to 0.4 mass %, with the balance being Fe and inevitable impurities, wherein a ratio of (b) the alloyed steel powder to a total of (a) the iron-based powder and (b) the alloyed steel powder is from 50 mass % to 90 mass %, and a ratio of Mo to the total of (a) the iron-based powder and (b) the alloyed steel powder is 0.20 mass % or more and less than 2.20 mass %.

シリコン塊の破砕方法及び装置

(57)【要約】 【課題】シリコン塊を破砕する場合、破砕工程で不純物 の付着を避けることができないので、塩酸洗浄を必要と し、中和後、純水洗浄のため多量の純水を必要とし、人 力で操作をするので、非常に手間がかかっていた。 【解決手段】シリコン塊を純水浴中に浸漬し、純水液中 で衝撃波を発生させ、これを収束してシリコン塊に印加 し、シリコン塊を破砕する。酸洗、純水洗浄等を要しな い。

Steel powder alloyed with molybdenum for powder metallurgy

An alloy steel powder for powder metallurgy includes an iron-based powder containing about 0.5 mass percent or less of Mn as a prealloyed element and 0.2 to about 1.5 mass percent of Mo as a prealloyed element; and a Mo-containing alloy powder bonded on the surface of the iron-based powder by diffusion bonding. In the alloy steel powder for powder metallurgy, a Mo average content [Mo]T (mass percent) satisfies formula 0.8>=[Mo]T-[Mo]P>=0.05, wherein the content [Mo]P is the above prealloyed Mo content (mass percent) in the iron-based powder.

Production method for water-atomized metal powder

Provided is a method for manufacturing water-atomized metal powder via low-cost, high-productivity water atomization, the method being capable of increasing amorphization and apparent density even for metal powders having a high Fe concentration. In the method for manufacturing water-atomized metal powder: in a region in which the average temperature of a molten metal stream, which has an Fe concentration of at least 76.0 at% and less than 82.9 at%, is at least 100°C higher than the melting point, primary cooling water is sprayed from a plurality of directions; a convergence angle, constituted by the angle between an impact direction of the primary cooling water, with respect to the molten metal stream, from one of the plurality of directions and an impact direction of the primary cooling water, with respect to the molten metal stream, from another one of the directions is 1025°; and secondary cooling water is sprayed so that the impact pressure thereof with respect the metal powder in a region in which at least 0.0004 seconds has elapsed from the impact of the primary cooling water and the average temperature of the metal powder is at least the melting point and no more than the melting point + 100°C is 10 MPa or greater.

Purification of metal silicon

(57)【要約】 【課題】本発明は、太陽電池用シリコンの製造に際し、 ボロン、炭素及び酸素の除去を、安価な設備で迅速に行 える金属シリコンの精製方法を提供することを目的とし ている。 【解決手段】精錬容器内で溶解した溶融状態の金属シリ コンから不純物元素を除去し、太陽電池用シリコンを製 造するに際し、該金属シリコンの浴中に酸化性ガスを吹 込み、ボロン及び炭素を酸化除去し、その後直ちに、吹 込みガスをアルゴン・ガスに切り替えて酸素を除去す る。

Method for producing silicon for use in solar cells

Method for producing highly purified silicon for use in solar cells by a single solidification purification, pouring silicon into a mold and gradually fractionally solidifying it while solidifying the liquid surface, followed by purifying the solidified silicon by zone melting or continuous casting using an electromagnetic mold, or by zone melting in combination with continuous casting, and optionally causing directional solidification to concentrate impurities, leaching and recycling.

Alloy steel powder for powder metallurgy

【要 約】 【課 題】 焼結体の密度を高く維持しながら、面圧疲労強度を高めることができる粉末冶金用合金鋼粉を提供する。 【解決手段】 予合金としてのMn含有量： 0.5質量％以下および予合金としてのMo含有量〔Mo〕 P ： 0.2〜1.5 質量％を含む鉄基粉末の表面に、Mo含有合金粉末を付着させた粉末冶金用合金鋼粉であって、Moの平均含有量〔Mo〕 T （質量％）が0.05≦〔Mo〕 T −〔Mo〕 P ≦0.8 を満足する粉末冶金用合金鋼粉とすることにより、当該合金鋼粉により得られる焼結体について、密度を高くしながら面圧疲労強度を高めることができる。 【選択図】 図１

Highly compressible iron powder

A highly compressible iron powder for powder metallurgy has an optimized particle size distribution. The Vickers microhardness of the particles that do not pass through the sieve having the nominal opening of 150 µm is controlled to be at most about 110. The iron powder is suitable for production of magnetic parts having high magnetism and mechanical parts having high mechanical strength.

Plasma torch

(57)【要約】 【課題】プラズマジェットに添加ガス又は粉体等の添加 物を添加する場合に、混合をよくする。 【解決手段】プラズマトーチ１は、中心部に添加物７を 吹出す吹出ノズル５を設け、その周囲にリング状のプラ ズマノズル４を設けた。このようなトーチ構造とするこ とによって、プラズマジェットが円筒状に噴出し、その 中心部に添加物７が添加され、添加物はすべてプラズマ ジェットに，混合され高温に加熱されて有効に利用され る。

Method for producing silicon for use in solar cells

Method for producing highly purified silicon for use in solar cells by a single solidification purification, poring silicon into a mold and gradually fractionally solidifying it while regarding solidification of the liquid surface followed by purifying the solidified silicon by zone melting or applying continuous casting using an electromagnetic mold, or by zone melting in combination with continuous casting, and optionally causing directional solidification to concentrate impurities, leaching and recycling.

Method for manufacturing water-atomized metal powder

Method for producing water-atomized metal powder

Water preferably having a water temperature of 30°C or lower is injected into a molten metal flow to divide and cool the molten metal flow, so that metal powder is obtained. Then, secondary cooling is performed on the metal powder so that water-atomized metal powder is obtained. In a case where injection water is to be used for the secondary cooling, the water temperature is preferably 10°C or lower. In a case where the secondary cooling is to be performed by using a container capable of cooling the metal powder by accommodating the metal powder together with the cooling water that has divided the molten metal flow or by using an impinging plate capable of cooling the metal powder by causing the metal powder, together with the cooling water that has divided the molten metal flow, to impinge against the impinging plate, the water temperature is preferably 30°C or lower. By performing secondary cooling, cooling in a transition boiling state or a nuclear boiling state can be realized from cooling in a film boiling state, so that quick cooling can be easily performed until the metal powder can be made amorphous. The secondary cooling of the divided metal powder is performed after the temperature of the metal powder reaches the MHF point or lower and the cooling start temperature or higher required for amorphousization.

Lighting damage prediction apparatus, method, and program

A lightning damage prediction apparatus that predicts a risk of a failure of access equipment due to a lightning strike is provided. A regression equation representing a relationship between a lightning strike density for each section in a prediction target area, an equipment density for each section of components of a plurality of types constituting equipment, and a lightning damage failure density for each section of the equipment or the component, corresponding to a first period in the past, is generated, and a lightning damage failure density for each section of a prediction target area corresponding to a second period is predicted on the basis of a lightning strike density and an equipment density for each section in the prediction target area corresponding to the second period that is a prediction target, and the regression equation.

Iron-based sintered body and method of manufacturing the same

Provided is an iron-based sintered compact having excellent mechanical properties. In this sintered compact, the surface area ratio of pores does not exceed 15%, and the median diameter D50 of the pores in terms of surface area does not exceed 20µm.

Iron powder for dust core

According to the present invention, an iron powder which is to be used for the production of a dust core and which exhibits a low hysteresis loss even after molding and stress relief annealing can be obtained by adjusting the apparent density of an iron powder for a dust core to 3.8g/cm3 or more, the mean particle diameter (D50) of the iron powder to 80µm or more, the grain diameters in the insides of at least 60% of the particles which constitute the iron powder and which are 100µm or more in diameter to 80µm or more, the area fraction of inclusions in the iron powder to 0.4% or less relative to the area of the matrix of the powder, and the micro Vickers hardness (test force: 0.245N) in the cross section of the iron powder to 90Hv or less.

Method of manufacturing soft magnetic dust core and soft magnetic dust core

Provided is a soft magnetic dust core having high density and high characteristics. A method for producing a soft magnetic dust core, wherein: a coated powder, which contains an amorphous powder composed of an Fe-B-Si-P-C-Cu system alloy, an Fe-B-P-C-Cu system alloy, an Fe-B-Si-P-Cu system alloy or an Fe-B-P-Cu system alloy and having a first crystallization initiation temperature Tx1 and a second crystallization initiation temperature Tx2 and a coating formed on the surface of the amorphous powder, is prepared; and a molding pressure is applied to the coated powder at a temperature of Tx1 - 100 K or less, and the coated powder is heated to the maximum temperature that is Tx1 - 50 K or more but less than Tx2, while applying the molding pressure thereto.

Method and apparatus for removing boron from metallurgical grade silicon

Method for producing soft magnetic dust core, and soft magnetic dust core

Provided is a soft magnetic dust core having high density and favorable properties. A method of manufacturing a soft magnetic dust core includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature T x1 and a second initial crystallization temperature T x2 ; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than T x1 - 100 K; and heating to a maximum end-point temperature equal to or higher than T x1 - 50 K and lower than T x2 with the compacting pressure being applied.

Iron powder for dust cores

Disclosed is an iron powder for dust cores, wherein the surface of each iron powder particle is covered with an oxide film composed of an Si-based oxide in which the atomic number ratio between Si and Fe satisfies the following relation: Si/Fe .gtorsim. 0.8. Consequently, the iron powder enables formation of a dust core having high resistivity and excellent iron loss characteristics, without causing decrease in mechanical strength.

Production method for a high-density iron-containing forging

Verfahren zum Herstellen eines eisenhaltigen Schmiedeteils mit hoher Dichte, das die folgenden Schritte in der genannten Reihenfolge umfasst: Vorbereiten einer eisenhaltigen Pulvermischung, die eisenhaltiges Metallpulver und Graphitpulver umfasst, vorläufiges Komprimieren der eisenhaltigen Pulvermischung, um einen vorläufigen Presskörper zu bilden, und Sintern des vorläufigen Presskörpers in einer nicht oxidierenden Atmosphäre bei einer Temperatur von 950°C oder mehr und von 1300°C oder weniger, um ein Formmaterial zu bilden, dadurch gekennzeichnet, dass das Sintern in der nicht oxidierenden Atmosphäre, deren Stickstoffteildruck 30 kPa oder weniger beträgt, durchgeführt wird, und dann Schmieden des Formmaterials mittels eines Schmiedens in geschlossenem Gesenk oder eines Schmiedens mit eingeschlossenen Gesenk, um ein Schmiedeteil mit hoher Dichte zu erzeugen. A process for producing a high-density iron-containing forging comprising the following steps in said order: Preparing an iron-containing powder mixture comprising ferrous metal powder and graphite powder, preliminarily compressing the iron-containing powder mixture to form a preliminary compact, and Sintering the preliminary compact in a non-oxidizing atmosphere at a temperature of 950 ° C or more and 1300 ° C or less to form a molding material; characterized in that sintering is performed in the non-oxidizing atmosphere whose nitrogen partial pressure is 30 kPa or less, and then Forging the molding material by means of closed die forging or forging with enclosed die to produce a high density forging.

Alloyed steel powder

Provided is a steel alloy powder with excellent flowability, moldability, and compressibility without containing Ni, Cr, or Si. A steel alloy powder made of a Mo-containing iron-based alloy, wherein: the Mo content in the iron-based alloy is 0.41.8 mass%; the weight basis median diameter D50 is at least 40 µm; and, with regard to particles with a circle equivalent diameter of 50200 µm among the particles contained in the steel alloy powder, the number average degree of area envelopment defined as (cross-sectional area of particle/area inside envelope) is 0.700.86.

Production of silicon for solar battery

(57)【要約】 【課題】本発明は、従来より少ないエネルギーで安価 に、不純物含有量の低い太陽電池用シリコンを製造する 方法を提供することを目的としている。 【解決手段】酸化珪素を炭素還元して金属シリコンとし て凝固し、破砕して粒状になった金属シリコンを、真空 精錬工程で脱Ｐする工程後、脱Ｂや脱Ｃのための酸化精 錬工程及び脱Ｏ工程、金属不純物元素を除去する凝固精 製工程を経て精製して太陽電池用シリコンを製造する方 法において、前記真空精錬工程または酸化精練工程に、 炭素還元後の溶融状態にある金属シリコンを直接供給 し、前記凝固及び破砕を省略して精製する。

Method for manufacturing soft magnetic iron powder

[Object] Provided is a method for manufacturing soft magnetic iron powder with which it is possible to effectively increase the amorphous material fraction of soft magnetic iron powder even in the case where the amounts of ferrous elements (Fe, Co, and Ni) are large.[Solution] A method for manufacturing soft magnetic iron powder, the method including ejecting high-pressure water to collide with a molten metal stream falling vertically downward, breaking up the molten metal stream into metal powder, and cooling the metal powder, in which, when a falling rate of the molten metal stream per unit time is defined as Qm (kg/min) and an ejection rate of high-pressure water per unit time is defined as Qaq (kg/min), a mass ratio (Qaq/Qm) is 50 or more, and a total content of ferrous constituents (Fe, Ni, and Co) is 76 at% or more.

Iron-based sintered body and method of manufacturing the same

Provided is an iron-based sintered compact having excellent mechanical properties. In this sintered compact, the surface area ratio of pores does not exceed 15%, and the median diameter D50 of the pores in terms of surface area does not exceed 20µm.

Iron powder for dust cores

The present invention provides iron powder for dust cores that has excellent compressibility and low iron loss after formation. In the iron powder for dust cores, Si content is 0.01 mass% or less, apparent density is 3.8 g/cm3 or more, the ratio of iron powder particles with a particle size of 45 µm or less is 10 mass% or less, the ratio of iron powder particles with a particle size of over 180 µm and 250 µm or less is less than 30 mass%, the ratio of iron powder particles with a particle size of over 250 µm is 10 mass% or less, and the Vickers hardness (test force: 0.245 N) of a powder cross-section is 80 Hv or less.

Metal powder and powder magnetic core using the same

This invention provides a metal powder for powder magnetic cores, which have good insulation performance and high magnetic flux density, and which is favorable for motor cores. Ferromagnetic metal powder may be coated with a coating material and a phosphate or phosphoric acid compound containing aluminum is used for the coating material. Coating the surface of iron powder with aluminum phosphate realizes to produce high-quality powder magnetic cores that have good insulation performance and high magnetic flux density and are favorable for motor cores. Further coating the aluminum phosphate-coated metal powder with silane compound or surfactant realizes more stable compressed shaped articles of the powder. And the properties of the articles do not fluctuate while stored for, so long as they are resistant to moisture. This invention contributes to producing powder magnetic cores for motors, and to the process for powder magnetic cores, furthermore, to the related art field.

Method for producing atomized metal powder

Removal of boron from metallic silicon

(57)【要約】 【課題】本発明は、太陽電池用シリコンの製造に際し、 ボロンの除去を従来より一層迅速に行える金属シリコン の精製方法を提供することを目的としている。 【解決手段】溶融状態にある金属シリコンの溶湯面に、 水蒸気を付加したアルゴン・ガスからなるプラズマ・ガ スを吹き付けて、該金属シリコンが含有するボロンを除 去するに際し、上記プラズマ・ガスに，さらに還元性ガ スを付加する。

Recovery of exhaust gas occurring in oxidation smelting of metal silicon and derivative therefor

(57)【要約】 【課題】本発明は、現在、排ガスとして大気中に放出し ているアルゴン・ガスを、プラズマ発生用ガスにリサイ クルし、精錬コストを安価にさせる「金属シリコンの酸 化精錬において生じる排ガスの回収方法及び装置」を提 供することを目的としている。 【解決手段】溶融状態にある金属シリコンに、水蒸気を 付加したアルゴン・ガスからなるプラズマ・ガスを吹き 付け、該金属シリコンが含有するボロン及び炭素を酸化 物として排ガス中に揮発除去するに際し、除湿及び除塵 した後の排ガスに、Ｈ 2 ガス及び水蒸気を一定濃度にな るよう添加し、そのガスを上記プラズマ・ガスとして循 環再使用する。

Method for producing water-atomized metal powder

_ 53 _ ABSTRACTWater with a temperature of 30 °C or lower is preferably applied to a molten metal stream, the moltenmetal stream is divided and cooled into a metal powder, andthe metal powder is secondarily cooled, whereby a water-atomized metal powder is obtained. In the case of using jetwater for secondary cooling, the water temperature ispreferably 10 °C or lower. In the case of secondary coolingin which a container capable of storing and cooling themetal powder together with cooling water used to divide themolten metal stream or a collision plate capable of coolingthe metal powder by allowing the metal powder to collidetherewith together with the cooling water used to divide themolten metal stream is used, the water temperature ispreferably 30 °C or lower. Performing secondary coolingenables cooling from a transition boiling state or anucleate boiling state which were otherwise a film boilingstate, thereby enabling rapid cooling to be readilyperformed such that the metal powder can be amorphized. Thedivided metal powder is secondarily cooled after thetemperature of the metal powder reaches a temperature notlower than the cooling start temperature necessary for amorphization nor higher than the MHF point.

Iron-based sintered powder metal body, manufacturing method thereof and manufacturing method of iron-based sintered component with high strength and high density

A sintered iron-based powder metal body with lower re-compacting load and having a high density and a method of manufacturing an iron-based sintered component with fewer pores of a sharp shape and having high strength and high density.

Iron powder for iron powder cores and method for selecting iron powder for iron powder cores

Provided is an iron powder for iron powder cores, the iron powder being capable of manufacturing an iron powder core having low iron loss and particularly low hysteresis loss .The following powder is suitable as a source powder for low-iron loss iron powder cores with an iron loss of less than 80 W/kg: an iron powder in which orientations are measured in a cross section of a compact formed with a molding pressure of 0.98 GN/mby electron backscatter diffraction (EBSD) and the average of KAMs calculated using EBSD analysis software is to 3.00° or less. The iron powder has a particle size distribution in which particles with a size of 45 |um or less are adjusted to 10% by mass or less, in which the average hardness of powder particles is 80 HV 0.025 or less in Vickers hardness, in which the product of the number (inclusions/m) of inclusions per unit area and the median size D50 (m) of the inclusions is 10,000 (inclusions/m) or less, and which has an apparent density of 4.0 Mg/mor more.

Refining of metal silicon

(57)【要約】 【課題】金属シリコンを精整して太陽電池用シリコンを 製造する従来方法は途中で凝固精製を行うので工程が長 く、熱ロスも大きい。これは歩留低下を招来し、電力原 単位を増加させるという問題がある。本発明は、前記従 来技術の問題点を解決し、不純物含有量の低い高純度の シリコンを、短時間に、安価に、大量に製造する技術を 提供することを目的とする。 【解決手段】金属シリコンを精製する方法において、該 金属シリコンを減圧溶解して真空精錬でＰを除去し、次 いで凝固させることなく、不活性ガスに水蒸気とＨ 2 ガ スの混合ガスを添加してなるプラズマ・ガスでＢ，Ｃを 除去すると共に、Ｆｅ，Ａｌ，Ｔｉ，Ｃａをも除去し、 さらにその後不活性ガス雰囲気で酸素を除去してから凝 固精製を行う。

Process and apparatus for refining silicon

Process and apparatus for refining silicon by treatment in a graphite vessel with irradiation with an electron beam while removing impurity elements by evaporation. A single graphite vessel is used, or plural graphite vessels are arranged in sequence. During treatment in successive graphite vessels, molten silicon is poured in succession from one vessel to another. Use of graphite vessels improves heat efficiency, prevents contamination and produces refined silicon containing very low contents of impurities.

Refining of silicon

(57)【要約】 【課題】太陽電池用シリコンを製造する際に、一方向凝 固精製を１回で済ませ、精製プロセスの簡略化、溶解エ ネルギーの減少、歩留りの向上を図る。 【解決手段】出発原料として金属シリコンを使用し、脱 Ｐ、脱Ｂ、Ｃ、Ｏの後、溶融シリコン１を鋳型２に単に 注湯して棒状の固化したシリコン３を鋳造し、この棒状 の固化したシリコンをゾーン溶解法によって精製し、Ｆ ｅ、Ａｌ、Ｔｉ、Ｃａを除去する。鋳造は電磁鋳型を用 いた連続鋳造とし、鋳片の引き抜き工程でゾーン溶解法 を適用してもよい。

Method for removing boron from metallurgical grade silicon and apparatus

Method and apparatus for refining metallurgical grade silicon to carry out deboronization rapidly in production of silicon for solar cells, by blowing a mixed gas of water vapor and inert gas on a surface of molten silicon, and wherein a reducing gas is further applied to the molten metal surface, and including the further step of controlling mix ratios of water vapor and reducing gas, the angle of blowing of the gas, and the deboronization parameters.

Mixed powder for powder metallurgy, sintered body, and method for producing sintered body

Disclosed is a mixed powder for powder metallurgy that has higher compressibility than partially-diffusion alloyed steel powder and can obtain a high forming density. A mixed powder for powder metallurgy including: (a) an iron-based powder containing Si in an amount of 0 mass% to 0.2 mass% and Mn in an amount of 0 mass% to 0.4 mass%, with the balance being Fe and inevitable impurities; and (b) an alloyed steel powder containing Mo in an amount of 0.3 mass% to 4.5 mass%, Si in an amount of 0 mass% to 0.2 mass%, and Mn in an amount of 0 mass% to 0.4 mass%, with the balance being Fe and inevitable impurities, wherein a ratio of (b) the alloyed steel powder to a total of (a) the iron-based powder and (b) the alloyed steel powder is from 50 mass% to 90 mass%, and a ratio of Mo to the total of (a) the iron-based powder and (b) the alloyed steel powder is 0.20 mass% or more and less than 2.20 mass%.

Mixed powder for powder metallurgy, sintered body, and method for producing sintered body

Disclosed is a mixed powder for powder metallurgy that has higher compressibility than partially-diffusion alloyed steel powder and can obtain a high forming density. A mixed powder for powder metallurgy including: (a) an iron-based powder containing Si in an amount of 0 mass% to 0.2 mass% and Mn in an amount of 0 mass% to 0.4 mass%, with the balance being Fe and inevitable impurities; and (b) an alloyed steel powder containing Mo in an amount of 0.3 mass% to 4.5 mass%, Si in an amount of 0 mass% to 0.2 mass%, and Mn in an amount of 0 mass% to 0.4 mass%, with the balance being Fe and inevitable impurities, wherein a ratio of (b) the alloyed steel powder to a total of (a) the iron-based powder and (b) the alloyed steel powder is from 50 mass% to 90 mass%, and a ratio of Mo to the total of (a) the iron-based powder and (b) the alloyed steel powder is 0.20 mass% or more and less than 2.20 mass%.

Mixed powder for powder metallurgy, sintered body, and method for producing sintered body

Provided is a mixed powder for powder metallurgy that has higher compressibility than partially diffusion-alloyed steel powder and that makes it possible to obtain high molding density. The mixed powder for powder metallurgy comprises an iron-based powder (a) containing 0-0.2 mass% of Si, 0-0.4 mass% of Mn, and a remainder of Fe and unavoidable impurities and an alloy steel powder (b) containing 0.3-4.5 mass% of Mo, 0-0.2 mass% of Si, 0-0.4 mass% of Mn, and a remainder of Fe and unavoidable impurities. The ratio of the alloy steel powder (b) to the total of the iron-based powder (a) and the alloy steel powder (b) is 50-90 mass%. The ratio of Mo to the total of the iron-based powder (a) and the alloy steel powder (b) is 0.20 mass% or more but less than 2.20 mass%.

保磁力の低い磁心とその製造方法およびその磁心用鉄粉

【課 題】保磁力の低い安価な磁心とその製造方法およびその磁心用鉄粉を提供する。 【解決手段】磁心を形成する鉄粉の全量に対して９０体積％以上が７５μｍ以下の粒径を有し、かつ磁心の密度が６ｇ／ｃｍ ３ 以下とする。 【選択図】 無

Connected dc power distribution system, power adjustment method and program

A connection direct-current power distribution system including a first direct-current power distribution system having a first voltage range and a second direct-current power distribution system having a voltage range narrower than the first voltage range includes a switch and a converter between the first direct-current power distribution system and the second direct-current power distribution system, and the switch is caused to enter a connected state, and power from a first storage battery in the first direct-current power distribution system is supplied to the second direct-current power distribution system via the converter configured to adjust a voltage of the power.

電磁ノイズ診断装置、電磁ノイズ診断システム及び電磁ノイズ診断方法

【課題】ネットワークに影響を及ぼす電磁ノイズの特徴量を簡易に特定する。 【解決手段】送信フレーム制御部１０により、所定のフレーム条件に沿った試験フレーム列を被試験対象ネットワーク１００に送信し、フレームロス検出部２０により、被試験対象ネットワーク１００を経由して帰還する試験フレーム列を検出してフレームロス率を算出し、電磁ノイズ解析部３０により、そのフレーム条件におけるフレームロス率と特性データとを比較する。これにより、電磁ノイズの特徴量を簡単で短時間に特定することができる。 【選択図】図１

Direct current distribution system, control apparatus, anomaly detection method and program

A DC power distribution system for performing DC power distribution from a power distribution side base to one or more power reception side bases via a power distribution network includes measuring instruments provided at the power distribution side base and at the one or more power reception side bases, and a control device, in which the control device includes an operation unit that acquires a voltage value and a current value measured by the measuring instrument and calculates an output side power sum that is a sum of power output from the power distribution side base, a power reception side power sum that is a sum of power input to the one or more power reception side bases, and a loss sum between the power distribution side base and the one or more power reception side bases, and a control unit that detects an abnormality in the distribution network by comparing the output side power sum with a total sum of the power reception side power sum and the loss sum.

アトマイズ金属粉末の製造方法

【課題】金属粉末の急速冷却が可能で、非晶質状態の金属粉末とすることができるアトマイズ金属粉末の製造具術を提供する。 【解決手段】溶融金属流に、液温：１０℃以下、噴射圧：５ＭＰａ以上の噴射水を噴射し、該溶融金属流を分断して金属粉とするとともに、該金属粉を冷却し、水アトマイズ金属粉末とする。液温：１０℃以下、噴射圧：５ＭＰａ以上の噴射水を用いる冷却は、冷却開始時から膜沸騰領域がなく、遷移沸騰領域での冷却となり、冷却を促進でき、金属粉末をアモルファス化できるまでの、急速冷却を簡便に行うことが可能となる。また、溶鋼金属流に不活性ガスを噴射して分断を噴射して行ない、分断された金属粉の冷却を、液温：１０℃以下、噴射圧：５ＭＰａ以上の噴射水を用いて行ない、ガスアトマイズ金属粉末とすることもできる。なお、分断された金属粉の噴射水冷却に際しては、金属粉の温度がＭＨＦ点以下となった以降に行うことが好ましい。 【選択図】図３

Detecting system for abnormality of supplementing ball of pinball machine

多結晶シリコン鋳塊の製造方法及び装置

(57)【要約】 【課題】シリコン鋳塊から太陽電池用の基板を製造する 場合、凝固過程で生ずる鋳塊内のクラックの発生を捕捉 し、クラックによる切捨に起因する基板の歩留り低下を 最小限にする。 【解決手段】多結晶シリコン鋳塊の製造に当り、凝固し た鋳塊中に発生するクラックによる弾性波を鋳型の外面 で捉え、クラックの位置をアコースティックエミッショ ン法により検出し、クラックが消滅する位置まで凝固シ リコンを再溶解して再凝固させ、クラックのない鋳塊を 製造する。

Dc power distribution system, control apparatus, operation state determination method and program

To provide a DC power distribution system that distributes power from a power supply device to a load device via a distribution network, the DC power distribution system including: a measuring instrument that is provided in the distribution network; and a control device that includes a determination unit that acquires, through optical fiber, a voltage value and a current value measured by the measuring instrument, and determines an operation state in the DC power distribution system on the basis of a waveform indicating a change in the voltage value and a waveform indicating a change in the current value.

情報漏洩防止装置およびそれを内蔵する装置

【課題】画像フレームの平均化処理による盗聴画像の明瞭化を防ぎ、盗聴防止効果を高めることが可能な情報漏洩防止装置およびそれを内蔵する装置を提供する。 【解決手段】情報漏洩防止装置１１は、コンピュータ１２などの画像インタフェース１３を持つ情報機器と接続され、ドットクロック抽出部１４、ドットクロック発生部１５、変調回路部１６、出力レベル調整部１７、防止信号出力部１８を備える。情報機器からの画像信号から抽出したドットクロックを妨害信号の源信号とし、画像フレームの平均化処理によって盗聴画像が見え易くなることを防ぐために、このドットクロックに変調を掛け、その変調パターンを画像信号の水平同期タイミングに同期させる。 【選択図】図１

Eisenbasiertes Vorlegierungspulver, eisenbasiertes diffusionsgeschweißtes Pulver und eisenbasiertes Legierungspulver für Pulvermetallurgie mit Verwendung von selbigem

Eisenbasiertes Vorlegierungspulver, eisenbasiertes diffusionsgeschweißtes Pulver und eisenbasiertes Legierungspulver für Pulvermetallurgie mit Verwendung von selbigem. Das eisenbasierte Vorlegierungspulver für Pulvermetallurgie nach einer Ausführungsform der vorliegenden Offenbarung beinhaltet 0,5-5,0 Gewichts-% an Cu, 0,1-0,5 Gewichts-% an Mo und einen Rest aus Fe und unvermeidbaren Verunreinigungen. Ein Cu Gehalt (Cu%) und ein Mo Gehalt (Mo%) erfüllen die nachfolgende relationale Gleichung (1): 0.3 × Cu% + 3 × Mo% ≤ 2.7...... (1) .

電磁ノイズ発生パターン推定装置、電磁ノイズ発生パターン推定方法及び電磁ノイズ発生パターン推定プログラム

【課題】電磁ノイズの知識を有した専門家や高価な測定器を用いずに、電磁ノイズの発生パターンを推定する。 【解決手段】パラメータ導出部１３が記録部１２に記録されたＣＲＣエラーのパターンから統計処理時間以上のＣＲＣエラーが発生しない箇所でデータを区切り、区切られた区間それぞれにおいて、連続してＣＲＣエラーが検出される時間幅を継続時間、連続してＣＲＣエラーが検出されない時間幅を休止時間、電磁ノイズの発生パターンのパラメータを導出し、統計処理部１４が各区間のパラメータを統計処理して電磁ノイズの発生パターンを推定する。 【選択図】図１

軸受用鉄粉および軸受用鉄粉の製造方法並びに軸受

【課題】含浸軸受を作製した際に、軸受の変形を招来する要因元素のCaを低減しつつ、多孔質な含浸軸受用の鉄粉を提供する。【解決手段】原料鉄粉中の生粉を見掛密度：3.40Mg/m3以下で、かつ篩方式で測定した50％平均粒子径（D50）：45.0〜65.0μmとし、さらに、原料酸化鉄粉の添加量を原料鉄粉に対して５〜30mass％とし、該原料酸化鉄粉のレーザー回折方式で測定した50％平均粒子径（D50）を1.50μm以下とし、さらに、軸受用鉄粉の見掛密度を1.80Mg/m3以上2.50Mg/m3以下であって、軸受用鉄粉中の酸素量を0.35mass％以下の範囲とする。【選択図】図１

Reduced iron powder and method for preparing same and bearing

Reduced iron powder that has fewer coarse inclusions, has excellent formability, has high porosity after sintering, has excellent reactivity per unit mass, and can be effectively used as reaction material even to the particle inside is provided. Reduced iron powder has an apparent density of 1.00 Mg/mto 1.40 Mg/m.

Method for preparing reduced iron powder

Reduced iron powder that has fewer coarse inclusions, has excellent formability, has high porosity after sintering, has excellent reactivity per unit mass, and can be effectively used as reaction material even to the particle inside is provided. Reduced iron powder has an apparent density of 1.00 Mg/mto 1.40 Mg/m.

雷対策必要設備抽出装置、雷対策必要設備抽出方法及び雷対策必要設備抽出プログラム

【課題】屋外の雷対策が必要な設備を効果的に予測する雷対策必要設備抽出装置、雷対策必要設備抽出方法及び雷対策必要設備抽出プログラムを提供する。【解決手段】雷対策必要設備抽出装置１００において、設備情報分析部１２１が、記録部１１０から落雷情報、落雷時の設備の雷害故障情報、及び設備情報を読み出して、雷害故障が発生した設備の設備情報と雷害故障が発生しなかった設備の設備情報を抽出する。パラメータ解析部１２２が、抽出された設備情報の雷害故障の発生した箇所に関連する項目をパラメータ化し、予測モデル構築部１３１が、パラメータ化された設備情報を機械学習して、落雷時に設備が雷害故障する可能性を出力する予測モデルを生成する。予測部１３３が、予測モデルに設備情報を入力し、落雷時に雷害故障が発生しやすい設備を予測する。【選択図】図１

コメント管理システム

【課題】コメントに適切にポイント付与できるコメント管理システムを提供する。 【解決手段】第一端末装置１２からのコメントを、対応する閲覧関連情報を提供したユーザの第二端末装置１３に送信する確認用コメント送信部１１０５と、送信したコメントのうちの、第二端末装置１３のユーザにより受取られたコメントを示す受取コメント情報を送信したユーザのポイントから、受取コメント情報が示すコメントを送信した第一端末装置１２のユーザのポイントに、予め指定されたポイントを移動させるポイント管理部１１０８とを有するコメント管理サーバ装置１１と、確認用コメントのうちの、ユーザが受取るコメントの指定を受け付ける受取コメント受付部１３０３と、受取られたコメントを示す受取コメント情報をコメント管理サーバ装置１１に送信する受取コメント情報送信部１３０４とを有する第二端末装置１３を備えた。 【選択図】図１

メッセージ作成装置、メッセージ作成方法及びメッセージ作成プログラム

【課題】メッセージ作成者の感情をメッセージ受信者に伝える。 【解決手段】電子メールの作成時の特徴量を測定する文章編集過程測定部４と、測定した特徴量に基づき感情を評価する感情評価部７と、評価した感情を電子メールに付加する感情付加機能部８とを備える。これにより、電子メール作成中の作成者の感情を評価して電子メールに付加することができるので、電子メール受信者に電子メール作成者の感情を伝えることができる。また、感情を評価する際の基準となる基準特徴量を測定された特徴量を反映させて更新する。これにより、電子メール作成時における個人差や癖のばらつきを考慮した感情の評価を行うことが可能となる。 【選択図】図１

広告ゲームシステム

【課題】各端末のユーザに広告データを用いた広告ゲームを実行させることにより広告の内容をユーザに詳しく理解させることができる広告ゲームシステムを提供する。 【解決手段】管理サーバ１０は、各広告についての広告画像データを管理すると共に、各移動通信端末４０に広告画像データを配信する。各移動通信端末４０は、管理サーバ１０から配信された広告画像データについて当該広告の内容を他のユーザに勧めるためのＰＲ情報を管理サーバ１０に登録する機能と、管理サーバ１０から送信された、管理サーバ１０に登録された他のユーザのＰＲ情報に対する評価の内容である評価情報を管理サーバ１０に登録する機能とを有する。管理サーバ１０は、各移動通信端末４０からＰＲ情報に対する評価結果の取得要求を受けたときに、そのＰＲ情報に対する評価情報に基づいて評価結果を作成し、当該移動通信端末４０に送信する。 【選択図】図１

Information processing apparatus, fuse selecting method and program

An information processing device includes: a data acquisition unit which acquires data indicating characteristics of a power supply system; and a fuse selection unit which selects a fuse to be blown when a short-circuit occurs in the power supply system on the basis of the data.

Production method for water-atomized metal powder

Provided is a method for manufacturing water-atomized metal powder via low-cost, high-productivity water atomization, the method being capable of increasing amorphization and apparent density even for metal powders having a high Fe concentration. In the method for manufacturing water-atomized metal powder: in a region in which the average temperature of a molten metal stream, which has an Fe concentration of at least 76.0 at% and less than 82.9 at%, is at least 100°C higher than the melting point, primary cooling water is sprayed from a plurality of directions; a convergence angle, constituted by the angle between an impact direction of the primary cooling water, with respect to the molten metal stream, from one of the plurality of directions and an impact direction of the primary cooling water, with respect to the molten metal stream, from another one of the directions is 1025°; and secondary cooling water is sprayed so that the impact pressure thereof with respect the metal powder in a region in which at least 0.0004 seconds has elapsed from the impact of the primary cooling water and the average temperature of the metal powder is at least the melting point and no more than the melting point + 100°C is 10 MPa or greater.

電磁ノイズ発生パターン推定方法、電磁ノイズ発生パターン推定装置及び電磁ノイズ発生パターン推定プログラム

【課題】電磁ノイズの知識を有した専門家や高価な測定器を用いずに、電磁ノイズの発生パターンを推定する。 【解決手段】検出部１１がイーサネットフレーム異常を検出し、分析部１３が検出したイーサネットフレーム異常に基づいて電磁ノイズの発生パターンを推定する。これにより、電磁ノイズの知識を有した専門家や高価な測定器を用いずに、電磁ノイズの発生パターンを推定することができる。 【選択図】図１

Fuse having frequency separation function

A fuse with a frequency separation function includes an input port portion, an output port portion, a first transmitting portion between the input port portion and the output port portion, the first transmitting portion configured to transmit a lightning surge current entering the input port portion and guide the lightning surge current to the output port portion, a second transmitting portion between the input port portion and the output port portion, the second transmitting portion configured to be capable of transmitting a normal current and an abnormal current entering the input port portion, and a melting mechanism portion which is provided between the second transmitting portion and the input port portion or between the second transmitting portion and the output port portion, the melting mechanism configured not to melt and break when the normal current passes, and configured to melt and break when the abnormal current passes.

周波数分離機能付きヒューズ

【課題】雷サージ電流では溶断せず、異常電流では確実に溶断する周波数分離機能付きヒューズを提供すること。【解決手段】周波数分離機能付きヒューズ１は、入力ポート部１ａと、出力ポート部１ｂと、入力ポート部と出力ポート部との間に設けられ、入力ポート部へ侵入した雷サージ電流を通過させ、出力ポート部へ導く第１の通過部１ｃと、入力ポート部と出力ポート部との間に設けられ、入力ポート部へ侵入した通常電流および異常電流を通過させることが可能な第２の通過部１ｄと、入力ポート部と第２の通過部との間、または、第２の通過部と出力ポート部との間に設けられ、通常電流が通過しても溶断せず、異常電流が通過すると溶断する溶断機構部１ｄ−２とを備える。【選択図】図１

圧粉磁心の製造方法および圧粉磁心

【課題】圧粉密度が高く、かつ鉄損の低い圧粉磁心の製造方法を提供する。 【解決手段】平均粒径が63〜150μｍの純鉄粉に、純鉄粉の見掛け密度が4.0g/cm 3 以上、4.2 g/cm 3 未満の場合はシリコーン樹脂を0.1〜0.2mass%混合し、また純鉄粉の見掛け密度が4.2 g/cm 3 以上の場合はシリコーン樹脂を0.05〜0.2mass％混合し、ついで100〜200℃に加熱した後、加圧成形し、さらに650℃以上で加熱する。 【選択図】なし

Method of manufacturing soft magnetic dust core

Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tx1 and a second initial crystallization temperature Tx2; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than Tx1−100 K; and heating to a maximum end-point temperature equal to or higher than Tx1−50 K and lower than Tx2 with the compacting pressure being applied.

Dc power distribution system, control apparatus, operating state determination method and program

A direct-current power distribution system for distributing power from a power supply device to a load device via a power distribution network includes a measuring instrument included in the power distribution network, and a control device including a determination unit configured to acquire a voltage value and a current value measured by the measuring instrument, and determine an operating state in the direct-current power distribution system on the basis of a waveform indicating change in the voltage value and a waveform indicating change in the current value.

Lightning strike induction system and method

A lightning induction system includes a plurality of flight vehicles 3 that fly between a lightning originating point 1 in the sky where lightning is generated and a ground surface 2. The flight vehicles 3 each include: a flight unit 10 that generates lift force and propulsion force; a conductor cable 20 that is engaged with the flight unit 10, extends downward, and has a predetermined length; and a weight unit 30 connected to the lower end of the conductor cable 20. The flight unit 10 is disposed in a Faraday cage 11. The Faraday cage 11 has a sphere shape, and the flight unit 10 is fixed by a support pillar 12 extending downward from the inner side of the top of the sphere.

シリコンの溶解方法

(57)【要約】 【課題】本発明は、微粉シリコンを電子ビームで効率良 く溶解するシリコンの溶解方法を提供することを目的と している。 【解決手段】減圧室内に配置した容器に、１ｍｍ以下の シリコン粉末を装入し、電子ビームの照射で溶解するに 際して、前記１ｍｍ以下のシリコン粉末を５ｍｍ以上に 成形した後、該成形物を前記減圧室内に設けたホッパ内 に貯蔵、乾燥させてから前記容器に装入する。

中空鉄粉

【課題】本発明は、従来技術にはない観点にたち、低コストで焼結部品軽量化の要請に応える軽量焼結部材を製造するために好適な原料粉を提供する。 【解決手段】成分組成が、質量％で、Ｃ：０．０１％以下、残部鉄及び不可避不純物からなり、粒子内部に空孔を有し、平均粒子径が５０μｍ以上、５００μｍ以下、粒子の平均肉厚が１０μｍ以上、平均粒子径の１／５以下であることを特徴とする中空鉄粉。 【選択図】図２

Verfahren und vorrichtung zur herstellung von polykristallinem silizium und verfahren zur herstellung eines siliziumsubstrats für eine solarzelle