Tin oxide piezoresistance material and method for producing the same

The invention discloses tin oxide piezoresistive material and preparation method thereof. The material takes SnO2 as a principle, at least one of Sb2O3 and Nb2O5 as a first accessory ingredient, Co2O3as a second accessory ingredient, TiO2 as a third accessory ingredient, and at least one of Cr2O3, Ni2O3and MnO as a fourth accessory ingredient. The ratio of ingredients is that: the principle: thefirst accessory ingredient: the second accessory ingredient: the third accessory ingredient: the fourth accessory ingredient equals to 100:0.03-0.15:0.4-2.0:0.5-4.0:0.5-1.0. The preparation method ofthe invention includes mixing the principle and the accessory ingredients into ground paste, pelleting, molding and sinter-roasting. The SnO2-based piezoresistive material produced by the invention has voltage gradient of 250-500V/mm, voltage nonlinear coefficient of 25-50 and high resistance to impulse impact, can be applied to electronic power circuits as lightningproof overvoltage protection elements ...

Piezoelectric ceramic element of metal aluminium electrode and preparation method thereof

The invention discloses a piezoelectric ceramic element of a metal aluminum electrode and a preparation method thereof. The piezoelectric ceramic element of the metal aluminum electrode comprises PZT ceramic and a metal electrode sintered on the upper and lower surfaces of the PZT ceramic; the metal electrode at least has an aluminum electrode surface which is sintered on the PZT ceramic by using aluminum electrode slurry. Based on mass percentage, the prescription of raw materials of the aluminum electrode comprises 55-60% of metal aluminum powder, 12-15% of unleaded glass powder with low melting point, 14-18% of ethylcellulose bond, 1.0% of antioxidant assistant and the balance of organic solvent. The preparation method comprises the steps of preparing the aluminum electrode slurry, printing, sintering the aluminum electrode slurry on the surfaces of the PZT ceramic and polarizing the electric field. In the invention, the bonding strength between the aluminum electrode surface and the ...

Dielectric ceramic materials for chip capacitor and method for preparing same

Method for preparing monocrystal BiFeO3 nanosheets

The invention discloses a method for preparing monocrystal BiFeO3 nanosheets, which comprises the following steps: dissolving Fe(NO3)3.9H2O and Bi(NO3)3.5H2O in a nitric acid solution to prepare a mother salt solution; dissolving CTAB (cetyltrimethylammonium bromide) in an organic solvent to prepare two CTAB solutions; dropwisely adding the mother salt solution to one CTAB solution, and stirring to obtain a solution A; dropwisely adding a KOH solution to the other CTAB solution, and stirring to obtain a solution B; dropwisely adding the solution B into the solution A, and stirring to obtain a hydrothermal reaction precursor; putting the hydrothermal reaction precursor and a solvent in a hydrothermal kettle; sealing the hydrothermal kettle, reacting in a 140-160-DEG C drying oven for 12-24 hours, and filtering to obtain a precipitate; and washing the precipitate, and drying to obtain the monocrystal BiFeO3 nanosheets. The method can synthesize pure-phase monocrystal BiFeO3 nanosheets at ...

Negative temperature coefficient thermal sensitive ceramic material and preparation method thereof

The invention belongs to the field of electronic ceramic materials, and particularly relates to a negative temperature coefficient thermal sensitive ceramic material and a preparation method thereof. The ceramic material comprises the following components: 0.69 (Bi < 1-x > Mg < x >) FeO < 3 >-0.31 BaTiO < 3 >, wherein x is equal to 0.1%-5.0%. The formula raw materials of the ceramic material comprise oxides, inorganic salts or organic salts containing the following elements: Bi, Fe, Ba, Ti and Mg metal elements; for example, the powder comprises Bi2O3, Fe2O3, BaCO3, TiO2 and MgO powder. The wide-temperature-range high-temperature thermistor material disclosed by the invention has good compactness and excellent thermosensitive performance, has obvious negative temperature coefficient characteristics in a range of 0-700 DEG C, and is suitable for preparing wide-temperature-range high-temperature thermistors.

Thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient and preparation method thereof

The invention discloses a thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient. MnO2, NiO and CuO are taken as main ingredients, and ZnO, Nb2O5, Y2O3 and Nd2O3 are taken as secondary ingredients; in the main ingredients, content of MnO2 is 65.0-70.4mol%, content of NiO is 16.3-18.3mol%, and content of CuO is 13.3-16.7mol%; amount of added ZnO is 3.3-13.3mol% of the amount of the main ingredients, amount of added Y2O3 is 0.3-0.7mol% of the amount of the main ingredients, amount of added Nb2O5 is 0.3-3.3mol% of the amount of the main ingredients, and amount of added Nd2O3 is 0.3-1.7mol% of the amount of the main ingredients. The invention also discloses a preparation method of the thermal sensitive ceramic material with negative temperature coefficient. The thermal sensitive ceramic material with negative temperature coefficient has superior characteristics of low resistivity and high B value.

Converter blowing method

The invention belongs to the technical field of steel making and discloses a converter blowing method. According to the converter blowing method, the technical problem of high endpoint phosphorus content caused when converter steelmaking is operated by adopting a double slag process in the prior art is solved. The converter blowing method comprises the following steps of retaining part of slags in the converter when the last converter steelmaking process is ended; carrying out sluggish slag treatment in the slag in the converter; after adding scrap steel and liquid molten in the converter, performing converter blowing; when the converter blowing is operated to a first preset time, pouring the first part of slag in the converter; adding lime in the converter for continuous converter blowing; when the converter blowing is operated to a second preset time, pouring the second part of slag in the converter. According to the converter blowing method, the technical effect of reducing the phosphorus ...

钛酸钡基电压非线性电阻及其制备方法

... 本发明提供一种钛酸钡基电压非线性电阻，由钛酸钡为主成分的陶瓷材料烧附银电极构成；其陶瓷材料的主成分表达式：(Ba#-[1-x]Sr#-[x])#-[m]TiO#-[3]，其中X＝0～0.2、m＝0.96～1.00；一种制备上述钛酸钡基电压非线性电阻的方法，包括步骤：(1)合成材料主成分(Ba#-[1-x]Sr#-[x])#-[m]TiO#-[3]，其中X＝0～0.2、m＝0.96～1.00；(2)在主成分中加入按比例称量的添加剂后加水混合球磨制成料浆；(3)在料浆加入聚乙烯醇溶液后干燥造粒；(4)造粒粉料经干压成型制成坯片；(5)将坯片在还原性气氛中烧结成半导性瓷片；(6)将半导性瓷片在900～1100℃的空气气氛中热处理；(7)上电极。本发明制作的电压非线性电阻电容量大、烧结温度低，生产工艺简单，制造成本低。 ...

Tin oxide piezoresistance material and method for producing the same

The invention discloses tin oxide piezoresistive material and preparation method thereof. The material takes SnO2 as a principle, at least one of Sb2O3 and Nb2O5 as a first accessory ingredient, Co2O3 as a second accessory ingredient, TiO2 as a third accessory ingredient, and at least one of Cr2O3, Ni2O3and MnO as a fourth accessory ingredient. The ratio of ingredients is that: the principle: the first accessory ingredient: the second accessory ingredient: the third accessory ingredient: the fourth accessory ingredient equals to 100:0.03-0.15:0.4-2.0:0.5-4.0:0.5-1.0. The preparation method of the invention includes mixing the principle and the accessory ingredients into ground paste, pelleting, molding and sinter-roasting. The SnO2-based piezoresistive material produced by the invention has voltage gradient of 250-500V/mm, voltage nonlinear coefficient of 25-50 and high resistance to impulse impact, can be applied to electronic power circuits as lightningproof overvoltage protection elements ...

Dielectric ceramic material for piece type capacitor and preparing method thereof

The invention discloses a dielectric ceramic material for piece type capacitor and preparing method, which comprises the steps of, (1) mixing each of third accessory constituents, heating till molten, using water-cooled quenching method to obtain glass, disintegrating by ball grinding to obtain glass state material, (2) mixing the main constituent and the first accessory constituent, watering, ball grinding or mixing uniformly to obtain slip, drying the slip into powder material, (3) subjecting the powder material obtained through drying in step (2) to calcinations in the air at 1100-1250 deg. C, thermal insulating 0.5-5 hours, watering, ball grinding till the grain size in the particles D50<=0.7 um, drying to obtain the main ingredient, (4) mixing the main ingredient, the second accessory constituent and the glass state material obtained in step (1) uniformly.

Bismuth ferrite-barium titanate lead-free piezoelectric ceramic material, preparation method and application

The invention discloses a bismuth ferrite-barium titanate lead-free piezoelectric ceramic material as well as a preparation method and application thereof. The piezoelectric ceramic is composed of 0.76 Bi < 1-x > M < x > FeO < 3-0.24 > BaTO < 3 + y > wt% MnO < 2 >, m represents rare earth elements including Yb, Ho and the like; x represents the mole fraction of M, y represents the mass percent of MnO2, x is larger than or equal to 0 and smaller than or equal to 0.04, and y is larger than or equal to 0.1 and smaller than or equal to 0.7 The oxygen vacancy concentration in ceramic crystal lattices is regulated and controlled, the microstructure is improved, and the piezoelectric ceramic with relatively high piezoelectric property, high Curie temperature, low dielectric property and insulating property is obtained.

Overvoltage and electric leakage integrated protection circuit breaker

The invention discloses an overvoltage and electric leakage integrated protection circuit breaker, comprising a shutdown switch, a first overvoltage protection component, a second overvoltage protection component, a zero-sequence current transformer, an electromagnetic relay, a tripping linkage mechanism and an electric leakage protection triggering circuit; the first overvoltage protection component comprises a voltage dependent resistor chip and a PTC thermistor chip located in an encapsulating layer and has three leading-out terminals; the second overvoltage protection component comprises a voltage dependent resistor chip and a PTC thermistor chip located in an encapsulating layer and has two leading-out terminals; when the shutdown switch is a single-phase power switch, only one first overvoltage protection component is installed; when the shutdown switch is a three-phase power switch, one overvoltage protection component and two overvoltage protection components are installed; when ...

Barium titanate based electric resistor non-linear to voltage and its preparing process

This invention provides a Ba titanate base voltage nonlinear resistor composed of ceramic material of Ba titanate as the main component added with sintered silver electrodes. A preparation method of the said resistor contains 1) Main components of the synthesis are (Bal-xSrx)m TiO2, in which x=0-0.2, m=0.96-100; 2) The main component is added with proportional weighted additives to be mixed with water to become pulp after balmill 3) The pulp is added with PVA solution to be dried to granulation 4) The granulation powders are processed to blank pieces after dry press 5) The blank pieces are sinerted to semiconductive ceramic plates in a reducbility atmosphere 6) To be heat treated in 900-1100 deg.c 7) Electrode is mounted.

Medium-high carbon alloy structural steel for fine blanking and manufacturing method thereof

The invention belongs to the technical field of alloy structural steel, and discloses medium-high carbon alloy structural steel for fine blanking and a manufacturing method thereof, and the steel comprises the following chemical components in percentage by weight: 0.39-0.43% of C, 0.17-0.3% of Si, 0.7-0.8% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, 0.02-0.05% of ALt, 0.15-0.25% of Mo, 0.9-1.1% of Cr and the balance of Fe and inevitable impurities. Through innovation of the components and the process, the medium-high carbon alloy structural steel for fine blanking with the hardness being 150-175 HV, the yield strength being 800-900 MPa, the tensile strength being 900-1000 MPa, the ductility being larger than or equal to 15%, the class D inclusion level being smaller than or equal to the class 1, the class DS inclusion level being smaller than or equal to the class 0.5, the center segregation level being smaller than or equal to the class C0.5, the banded ...

Bismuth ferrite-barium titanate high-temperature lead-free piezoelectric ceramic material and preparation method thereof

The invention belongs to the technical field of piezoelectric ceramics, and discloses a bismuth ferrite-barium titanate high-temperature lead-free piezoelectric ceramic material and a preparation method thereof. The composition of the piezoelectric ceramic material is 0.74 Bi < 1.02 > FeO < 3-(0.26-x) > BaTiO < 3-x > BiAlO < 3 + y >% GeO < 2 >, wherein x and y respectively represent molar fractions of BiAlO3 and GeO2, and x is greater than or equal to 0 and less than or equal to 0.02, 0lt; yt; Yt; and 0.7. According to the preparation method disclosed by the invention, the structure and the performance are optimized by utilizing sintering assistance and substitution modification of GeO2 and combining high Curie temperature and low loss of BiAlO3, so that the Curie temperature and the piezoelectricity are obviously improved. The lead-free piezoelectric ceramic material provided by the invention is simple in synthesis process and high in Curie temperature, and has better electrical properties ...

Preparation method of high-nitrogen acidic phosphate fertilizer

The invention discloses a preparation method of a high-nitrogen acidic phosphate fertilizer, and relates to the technical field of phosphate fertilizer preparation. The method comprises the following steps: adding sludge acid, raffinate acid and wet-process phosphoric acid into an acid mixing tank to form mixed acid A; using wet-process phosphoric acid and sulfuric acid to wash ammonia-containing tail gas generated in granulation and drying links, recycling obtained washing liquid, and introducing the washing liquid into an underground tank to form slurry B; adding urea particles into an underground tank, and stirring and reacting with the slurry B to obtain slurry C; pumping the slurry C into an acid mixing tank, and uniformly stirring and mixing the slurry C with the mixed acid A to obtain slurry D; the slurry D is pumped into a feeding tank and reacts with ammonia in a pre-neutralization tank/tubular reactor to form neutralized slurry, spraying ammoniation granulation is conducted in ...

Piezoelectric ceramic element of metal aluminium electrode and preparation method thereof

The invention discloses a piezoelectric ceramic element of a metal aluminum electrode and a preparation method thereof. The piezoelectric ceramic element of the metal aluminum electrode comprises PZT ceramic and a metal electrode sintered on the upper and lower surfaces of the PZT ceramic; the metal electrode at least has an aluminum electrode surface which is sintered on the PZT ceramic by usingaluminum electrode slurry. Based on mass percentage, the prescription of raw materials of the aluminum electrode comprises 55-60% of metal aluminum powder, 12-15% of unleaded glass powder with low melting point, 14-18% of ethylcellulose bond, 1.0% of antioxidant assistant and the balance of organic solvent. The preparation method comprises the steps of preparing the aluminum electrode slurry, printing, sintering the aluminum electrode slurry on the surfaces of the PZT ceramic and polarizing the electric field. In the invention, the bonding strength between the aluminum electrode surface and the ...

Seawater corrosion resistant steel for steel sheet pile and manufacturing method of seawater corrosion resistant steel

The invention belongs to the technical field of seawater corrosion resistant steel, and discloses seawater corrosion resistant steel for a steel sheet pile and a manufacturing method of the seawater corrosion resistant steel. The seawater corrosion resistant steel comprises the following chemical components in percentage by weight: 0.05 to 0.075 percent of C, 0.15 to 0.3 percent of Si, 0.5 to 0.7 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.002 percent of S, 0.2 to 0.3 percent of Cu, 0.55 to 0.65 percent of ALt, 0.04 to 0.06 percent of Ti, 0.9 to 1.1 percent of Cr, less than or equal to 0.005 percent of N and the balance of Fe and inevitable impurities. The Al-Cr-Cu-Si element system is adopted, compared with an element system of conventional seawater corrosion resistant steel, expensive alloy is not added, the cost can be remarkably reduced, through the synergistic effect of the elements and adjustment of the manufacturing method, the steel has excellent ...

Pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device

The invention discloses a pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device. The device comprises a positive temperature coefficient thermosensitive resistance sheet, a negative temperature coefficient thermosensitive resistance sheet and a pressure-sensitive resistance sheet which are positioned in an encapsulating layer; a first electrode of the positive temperature coefficient thermosensitive resistance sheet and the first electrode of the pressure-sensitive resistance sheet are clung to each other and electrically connected to form a common end which is led out through a first lead; a second electrode of the positive temperature coefficient thermosensitive resistance sheet and the first electrode of the negative temperature coefficient thermosensitive resistance sheet are clung to each other and are electrically connected; the second electrode of the pressure-sensitive resistance sheet is led out through a second lead; the second electrode ...

Residual-current circuit breaker with overvoltage protection function

The invention discloses a residual-current circuit breaker with an overvoltage protection function. The residual-current circuit breaker comprises a shutdown switch and an electric leakage/overvoltage protection part, wherein the electric leakage/overvoltage protection part comprises an overvoltage protection component, a zero sequence current mutual inductor, an electromagnetic relay, a releasing link gear and an electric leakage prevention trigger circuit; the overvoltage protection component comprises a piezoresistor disc and a PTC thermistor disc arranged inside an encapsulating layer; an electrode on one surface of the piezoresistor disc is closely connected with the electrode on one surface of the thermistor disc; the electrode on the other surface of the piezoresistor disc and the electrode on the other surface of the thermistor disc are respectively welded with lead wires to form lead-out ends; when the electromagnetic relay is actuated after power is on, the releasing link gear ...

Dielectric ceramic materials for chip capacitor and method for preparing same

The present invention provides the preparation process of dielectric ceramic material for low voltage non-linear chip capacitor. The preparation process includes the following steps: 1) preparing glass state material as the third auxiliary component with SrO, CaO, BaO, B2O3 and SiO2 in the molar ratio of 0.5 to 0.5 to 0.2-0.5 to 1.0-2.0 to 0.5-1.0; 2) preparing the main component in the chemical expression of (Ca1-x-ySrxBay)(Ti1-zZrz)O3, where, x is 0.15-0.19, y is 0.14-0.18 and z is 0-0.04; 3) mixing homogeneously the main component, the first auxiliary component (MgO in 0.8-1.5 mol% and MnO2 in 0.1-0.2 mol%), the second auxiliary component (RE oxide Re2O3 in 0.4-1.5 mol%) and the third auxiliary component to obtain the dielectric ceramic material of the present invention. The dielectric ceramic material may be used in producing inner nickel electrode type ceramic capacitor with very low voltage non-linearity of capacitance.