一种无TiC杂质的Ti#-[3]SiC#-[2]材料的制备方法

A Ti3SiC2 material without TiC inpurity is prepared through proportionally mixing Al with its raw materials, and hot-pressure sintering or hot-isostatic sintering at 1350-1650 deg.C for 0.5-2 hr to obtain Ti3Si1-xAlxC2 sosoloid, where x=0.02-0.2. Its advantage is high high-temp antioxidizing performance.

Ta2AlC nano lamina block ceramic and preparation method thereof

The present invention relates to one kind of nanometer laminar Ta2AlC ceramic block and its in-situ reacting and hot pressing preparation process. The nanometer laminar Ta2AlC ceramic belongs to hexagonal system of space group P63/mmc, and with lattice constants of a 3.08 and c 13.85, and theoretic density of 11.52 g/cu cm, and has covalent bond Al-Ta bonding and certain microscopic plasticity in [0001] direction. It is excellent heat and electric conductor, has easy machining and heat shock insensitivity, and may be used as high temperature structural and functional material. It is prepared with Ta powder, Al powder and graphite powder as material, and through dry ball milling inside a resin tank for 10-20 hr, sieving, cold pressing in a graphite mold to form, vacuum or argon protected sintering in a hot pressing furnace at 1500-1700 deg.c and 20-40 MPa for 20-120 min. The Ta2AlC ceramic has high density and high purity.

High-toughness and wear-resistant ceramic complex cutter material

Diffusion connection technique for ternary layered ceramic aluminum titanium carbide

Method for raising resistance of Ti3AlC2 and Ti2AlC and their composite materials to molten salt corrosion

Method for preparing hafnium-aluminum-carbon ceramic material by in-situ reaction

The invention relates to the technology for preparing ultrahigh temperature resistant ceramics and particularly provides a method for preparing ceramic hafnium-aluminum-carbon (Hf3Al3C5, Hf3Al4C5, Hf2Al4C6 and multiphase composite) material by in-situ reaction, and the method solves the problems that the hafnium-aluminum-carbon ceramic material prepared by the prior art is unpractical, and the like. The method adopts Hf powder, Al powder and C powder which are of certain stoichiometric ratios as the raw materials; the raw materials are ball-milled for 5 to 50 hours, cold-pressed into disc shape under the pressure of 10 to 20MPa, loaded in a graphite mold, and heated to 1,600 DEG C to 2,400 DEG C in a hot pressing furnace at a heating rate of 2 to 50 DEG C per minute, wherein inert gas (such as argon) is pumped into the hot pressing furnace as the protecting gas (or the hot pressing furnace is in vacuum); and the in-situ hot pressure reaction is carried out for 0.1 to 4 hours, the hot pressure ...

Method for uniformly and controllably coating conducting carbon layer at surface of LiFePO4 granule surface

The invention relates to a method for coating an even and controllable deposit carbon layer on the surface of LiFePO4 particles serving as lithium ion battery cathode materials for increasing the LiFePO4 conductivity. The method adopts the concrete preparation processes that: LiFePO4 powders are placed in a constant temperature zone of a chemical vapor deposition furnace, then the air in the furnace is fully discharged for inputting inert gases, after the temperature rises to the set level, a carbon source gas is input for covering a conductivity carbon film on the surface of the LiFePO4 particles evenly, the LiFePO4 coated with the carbon film has excellent conductivity which is increased by five orders of magnitude compared with the condition before coating. The chemical vapor deposition temperature ranges from 580 to 720DEG C, the deposition time is from 1 to 10 hours, and the volume percent of the carbon source gas is between 1 and 20 percent, and a sample deposited with carbon iscooled ...

Wet-chemical method for preparing MAX phase porous catalyst carrier material

The invention relates to a wet-chemical method for preparing MAX phase porous catalyst carrier material, in particular to a method for preparing MAX phase porous material with controllable structure by preparing sizing agent with high stability and using sizing agent with different solid contents with wet-chemical method. Stable MAX phase sizing agent is firstly prepared, wherein the content of solid substance is 5-45vol%, the content of dispering agent is 0.5-5wt% of that of the solid substance. Porous template material is then dipped with the sizing agent, and the template material is burned off after the sizing agent is dried so as to obtain porous material alloy powder. After the porous material alloy powder is sintered, the MAX phase porous catalyst carrier material is obtained. The porous catalyst carrier material with controllable aperture size and porosity is obtained with wet-chemical method, and the catalyst coating of the porous catalyst carrier material can be carried out by ...

TaC-SiC ceramic composite material synthesized by hot pressing at in-situ reaction and synthetic method thereof

The invention relates to a ceramic matrix composite material and a synthetic method thereof, which are concretely an in-situ reactive synthesized TaC-SiC ceramic composite material by hot pressing and a synthetic method thereof. The method aims at solving the problems that the oxidation resistance of TaC is not ideal and loose surface oxide layers are easy to form in an oxidizing atmosphere, and the like. Two composition phases of TaC and SiC are in-situ formed and the percentage content of SiC is 0 to 50vol. percent. The concrete synthetic method is as follows: tantalum powders, silicon powders and graphite powders are used as materials which are ball milled for 10 to 40 hours under dry condition in a resin tank, after sieving the materials are put in a graphite die for cold molding (5 to 20 MPa), and then the materials are sintered in vacuum or a hot pressing furnace introduced with argon, with the sintering temperature of 1950 to 2150 DEG C, heat preserving sintering time of 1 to 2 hours ...

Composite material of aluminum titanium carbide / titanium diboride, and preparation method

This invention relates to a method for preparing TiB2 particles reinforced Ti3AlC2-based composite material by in situ synthesis. The composite material is composed of Ti3AlC2 matrix 70-90 vol. %, and TiB2 particles reinforcing phase 10-30 vol. %. The composite material is prepared from B4C powder, Ti powder, Al powder and graphite powder at a mol. ratio of 2:(40.4-13.4):(13.6-3.6):(20.4-3.9). The method comprises: mechanically mixing the above raw materials for 10-18 h, loading into a graphite mold, molding by cold-pressing under 5-10 MPa, and sintering in a hot pressing furnace in inert atmosphere at 1400-1600 deg.C (heating rate = 10-30 deg.C/min) and 20-40 MPa for 0.5-2 h. The method can prepare high-strength compact Ti3AlC2/TiB2 composite material at relative low temperature.

Nano laminated Ta2AlC ceramic powder and preparing method thereof

The invention relates to single-phase nano layered ceramic power and a preparation method, in particular to nano layered Ta₂AIC ceramic power prepared by in-situ reaction and a preparation method. The nano layered Ta₂AIC ceramic belongs to a hexagonal crystal system, the space group is P6₃/mmc, the constant a of the unit cell crystal lattice is 3.08, and the constant c is 13.85. The nano layered Ta₂AIC ceramic is a good heat conductor and can be the reinforced phase of a metal matrix composite material as well as the weak interphase of a ceramic matrix composite material to increase tenacity. In the specific preparation method of the single-phase Ta₂AIC powder, tantalum powder, aluminium powder and graphite powder as materials are milled in a resin pot for five to thirty hours under a dry condition, are loaded into a graphite powder die for cold pressing shaping under the pressure of 5 to 20 Mpa after being sifted out and are thermally ...

In situ reaction heat synthesized TaC-TaSi2 ceramic composite material and preparation thereof

The invention relates to a ceramic matrix composite material and a method for preparing the same, in particular to a TaC-TaSi2 ceramic composite material synthesized by hot pressing reaction in situ and a method for preparing the same. The two components TaC and TaSi2 are reacted in situ with a volume percentage of 0 Подробнее

Preparation method for nanometer-level oxide ceramic powder

The present invention relates to a preparation method of a nanometer-level oxide ceramic powder. It mainly uses metallic nitrate and/or hydrochloride as raw materials and adds ammonia water. The above-mentioned materials are simultaneously heated and pressurized, its temp. is 100-300 deg.C, and its pressure is 5-10MPa, and the grain size of the obtained ceramic powder is less than 20nm, and the crystal grain size of the ceramic material made up from said powder sintered below 1300 deg.C is less than 100nm.

Method for simulating complex environment in low earth orbit space, and equipment of use

A device used for simulating space composite environment near ground orbit is prepared for carrying out vacuum preair-out of vacuum chamber by vacuuming, leading oxygen in, utilizing magnetic field and microwave to couple with oxygen for generating oxygen plasma by electric-discharging, impacting target being exerted with negative bias voltage by oxygen plasma under magnetic field constraint to convert oxygen plasma to be neutral oxygen atom for generating space composite environment near ground orbit at sample table.

Zirconium titanium carbide particle reinforced silicon aluminum titanium carbide zirconium based composite material and preparation thereof

The invention relates to a ceramic-matrix composite material as well as a preparation method thereof, in particular to a titanium zirconium carbide particle reinforced silica-alumina titanium zirconium carbide matrix composite material and a preparation method thereof. A zirconium titanium carbide particle reinforced silica-alumina titanium zirconium carbide solid solution adopting the in-situ synthesis has a zirconium titanium carbide particle reinforced phase with the volume percentage of 5 to 30 percent; and the preparation method comprises: firstly, taking a titanium powder, a zirconium powder, a silicon powder, an aluminum powder and a graphite powder as raw materials, mixing the materials by a physical mechanical method for 10 to 25 hours, putting the materials in a graphite mould for cold briquetting, with the exerted pressure of 5 to 20MPa, and sintering the materials in a hot pressing furnace input with a protective atmosphere, with a rate of rise of temperature of 5 to 50DEGC/ ...

Preparation method of bulk Y2Si2O7/ZrO2 ceramic composite material with accurately controllable dense proportion

The invention relates to a preparation technique of Y2Si2O7/ZrO2 ceramic composite material, in particular to a preparation method of bulk Y2Si2O7/ZrO2 ceramic composite material with accurately controllable dense proportion. The preparation process comprises the following steps of: (1) firstly, preparing Y2Si2O7 ceramic powder, with a mixture of Y2O3 and SiO2 as the raw material, preparing single-phase Y2Si2O7 ceramic powder; (2) secondly, adding predetermined volume parts of zirconium oxide powder to the Y2Si2O7 ceramic powder; mixing the two powders by ball milling uniformly, then molding the powder to obtain a green body, and carrying out pressure-less sintering with a sintering temperature of 1100-1600 DEG C and time of 0.5-2h to obtain a compacted Y2Si2O7/ZrO2 ceramic composite material with a density of 85-100% of the theoretical density. According to the invention, a bulk Y2Si2O7/ZrO2 ceramic composite material with the accurately controllable dense proportion can be prepared by ...

In situ reaction heat synthesized TaC-TaSi2 ceramic composite material

The invention relates to a ceramic matrix composite material and a method for preparing the same, in particular to a TaC-TaSi2 ceramic composite material synthesized by hot pressing reaction in situ and a method for preparing the same. The two components TaC and TaSi2 are reacted in situ with a volume percentage of 0 Подробнее

Method for preparing zirconium-aluminum-silicon-carbon ceramic block material by in-situ reaction under hot pressure

The invention relates to the technology for preparing ultrahigh temperature resistant ceramics and particularly provides a method for preparing ceramic zirconium-aluminum-silicon-carbon (Zr3 [Al(Si)]4C6 and Zr2 [Al(Si)]4C5) block material by in-situ hot pressure reaction, and the method can solve the problems of complicated process and small molding size of samples of non-in-situ synthesizing method. The method adopts Zr powder, Al powder, Si powder and C powder as the raw materials according to certain stoichiometric ratio; the raw materials are ball-milled for 5 to 50 hours, cold-pressed into disc shape under the pressure of 5 to 20MPa, loaded in a graphite mold, and heated to 1,600 DEG C to 2,400 DEG C in a hot pressing furnace at a heating rate of 2 to 50 DEG C per minute, wherein inert gas (such as argon) is pumped into the hot pressing furnace as the protecting gas (or the hot pressing furnace is in vacuum); the in-situ hot pressure reaction is carried out for 0.1 to 4 hours, and ...

一种锡碳化钛颗粒增强铜基复合材料及其制备方法

... 本发明涉及一种锡碳化钛颗粒增强铜基复合材料及其制备方法。本发明复合材料由锡碳化钛(Ti#-[2]SnC)颗粒增强相和铜基体组成，其中Ti#-[2]SnC颗粒增强相的体积百分数为5～50％；其制备方法是：首先，将Ti#-[2]SnC颗粒和Cu粉末采用物理机械方法均匀混合，然后在真空或惰性气体保护下热压烧结或热等静压烧结，温度750℃～900℃、压力20～50MPa，烧结时间0.5～2小时，制备成Ti#-[2]SnC颗粒增强Cu基复合材料。本发明可制备出具有高强度、高导电性、耐高温和自润滑等综合性能的锡碳化钛颗粒增强铜基复合材料。 ...

PREPN. OF MONOCRYSTALLINE SILICON CARBIDE SHORT FIBER

The present invention refers to the preparation of monocrystalline silicon carbide. It uses powdered silicon oxide microcrystalline as raw material, graphite as reducing agent, and fluoride as whisker formation agent and monocrystalline fibre with diameter of 3-5 micron and length of 5-10 mm is obtained at 1400-1600 deg.C for 4-5 hr under protection of argon atmosphere. The monocrystalline silicon carbide fibre provided by present invention is an ideal component of composite materials.

Method for producing Ti*AlN block body material by original position hot pressing solid-liquid phase reaction

The present invention relates to a preparation technology of processable layered ceramic, and in particular, provides a preparation method of Ti₂AlN block material by using an in situ heat pressure/solid-liquid phase reaction. The TiN powder, Al powder and Ti powder of a certain chemical measurement ratio are used as raw materials; the raw materials are milled for 5 to 15 hours and then cold-pressed to be cake-shaped under a pressure of 10 to 20MPa; the materials are filled in a graphite mold; in a hot-pressure furnace with inert gases (such as argon) as a protective gas (or in a vacuum state) and of a temperature-boosting rate of 2 to 50 DEG C per minute, the materials are heated to be at a temperature between 1100 and 1600 DEG C; thein situ heat pressure/solid-liquid phase reaction is done for 0.5 to 4 hours. The hot-pressure is between 20 and 40MPa. The present invention can synthesize Ti₂AlN block material of high purity, high strength, corrosion resistance and ...

Method for prefabricating straight through crack and dedicated device therefor

This invention discloses a pre-process straight crack of engineer ceramics material and rigid material and its special device. The method is to use the strain rule of the ceramics material crack expansion; first to cut a •¢ shape cut or triangle cut in the outer round shear machine in the specimen; to make the strain of the crack top end under control through one limit deflection degree and vertical constrains bending load. The device comprises rigid rack, clock gage, adjustable top pillar, and tight screw. The parallel beam forms rigid rack through vertical beam. There fixed with clamping beam specimen tight screw. The clock gage test part is connected with the adjustable top pillar on the back of the beam specimen.

Instant liquid-phase pervasion jointing ternary layered ceramic titanium carbon silicification technique

The invention discloses a new instant liquid-phased dispersing connecting technique of ternary layered ceramic Ti3SiC2, which comprises the following steps: adding aluminum foil with thickness between 50 um and 100um among the welded ternary layered ceramic Ti3SiC2; placing the test sample in the hot-pressed furnace; aerating argon gas to protect; insulating under 600-650 deg. c at 10-20Mpa for 10-30 min; heating at 10-15deg. c/min; setting the welding temperature at 1400-1500 deg. c under 2-5Mpa for 90-180 min. The invention avoids the influence of relative joint strength due to brittle to improve the joint bending strength by 65%, which expands the using scale of Ti3SiC2 ceramic under 1000 deg. c.

Wet-chemical method for preparing MAX phase porous catalyst carrier material

The invention relates to a wet-chemical method for preparing MAX phase porous catalyst carrier material, in particular to a method for preparing MAX phase porous material with controllable structure by preparing sizing agent with high stability and using sizing agent with different solid contents with wet-chemical method. Stable MAX phase sizing agent is firstly prepared, wherein the content of solid substance is 5-45vol%, the content of dispering agent is 0.5-5wt% of that of the solid substance. Porous template material is then dipped with the sizing agent, and the template material is burned off after the sizing agent is dried so as to obtain porous material alloy powder. After the porous material alloy powder is sintered, the MAX phase porous catalyst carrier material is obtained. The porous catalyst carrier material with controllable aperture size and porosity is obtained with wet-chemical method, and the catalyst coating of the porous catalyst carrier material can be carried out by ...

Zirconium-aluminum-silicon-carbon-silicon carbide composite material and preparation method thereof

The invention relates to ultrahigh temperature resistant ceramic and preparation technology thereof, in particular provides a zirconium-aluminum-silicon-carbon-silicon carbide composite material and a method for preparing the zirconium-aluminum-silicon-carbon-silicon carbide composite material by in-situ reactive hot pressing. Zr powder, Al powder, Si powder and C powder in a certain stoichiometric ratio are used as raw materials; the raw materials are mixed for 5 to 50 hours by using a physical and mechanical method and are cold-pressed into cakes under the pressure of 5 to 20MPa; and the cakes are filled into a graphite mold and are heated to 1,600 to 2,400 DEG C in a hot pressing furnace into which inert gas serving as protective gas is introduced (or in vacuum) for in-situ hot pressing reaction for 0.1 to 4 hours under the hot pressing pressure of 20 to 40MPa. In the invention, the zirconium-aluminum-silicon-carbon-silicon carbide composite material with high hardness, high strength ...

CrN/CrAlN protective coating capable of resisting high temperature corrosion in wide temperature range and preparing method

Tin titanium carbide granule reinforced copper base composite material and its preparation method

The invented composite material consists of wild phase of Ti2SnC granule and copper base with percentage of volume as 5-50%. The preparing procedures are as follows. The Ti2SnC granule and Cu powder are mixed evenly by use of physical and mechanical method. Then, under condition of vacuum or in protection of inert gases, the sinter of hot pressing or sinter of isostatic pressing in temperature at750-900 deg.C, pressure at 20-50 MPa and agglomeration time as 0.5-2 hr. carries out to obtain the composite material. The prepared composite material possesses the synthetical capabilities of high intensity, high electrical conductivity, high temperature resistant and self lubricating.

Method for preparing titanium aluminium carbon block material by in-situ hot pressing/solid-liquid phase reaction

An in-situ hot-pressing and solid-liquid phase reaction process of preparing Ti-Al-C lump material features that the raw materials including Ti powder, Al powder and C powder in the atom ratio of 3 to 1.0-1.1 to 1.8-2.0 are made into Ti-Al-C lump material through ball-grinding for 5-15 hr, pressing under 8-12 MPa pressure into cake shape, and in-situ hot-pressing and solid-liquid phase reaction for 0.5-4 hr inside a graphite mold in a Ar protected hot-pressing furnace at 1200-1500 deg.C with the temperature rise rate being 5-30 deg.c/min. The present invention has relatively low temperature and short time.

Method for preparing metal-base composite material reinforced by non-continuous ceramics reinforcing agent

The present invention relates to a preparation method of metal-based composite material which is noncontinuously reinforced by ceramic reinforcing agent. It is characterized by that before preparation of metal-based composite material, a metal base coating is precoated on the noncontinuous reinforcing agent surface, the coating thickness is 20-100 micrometers, and the applicable metal base material can be selected from Ni-Cr-Al-Ti, Fe-Ni-C and Ni-Ti alloy and metals of Ni, Mo and Cu, and the reinforcing agent can be selected from TiC, WC, SiC and TiB2 particles or whiskers. Said invented product possesses good property, and cost is low.

酶法测定乙酰乙酸试剂盒

... 酶法测定乙酰乙酸试剂盒，一种酶法测定乙酰乙酸试剂盒。糖尿病酮症酸中毒是由血酮体增高引起，乙酰乙酸是酮体重要组成部分，占酮体总量20％，酮症诊断治疗不及时将有生命危险，乙酰乙酸测定有显色法等。本产品的各组分含量的每升中毫摩尔比为磷酸氢二钠－磷酸二氢钠82、乙二胺四乙酸二钠22、氯化镁5.5、叠氮钠0.020、还原型烟酰胺腺嘌呤二核苷酸2、硫酸铵55，β-羟丁酸脱氢酶30国际单位/升，以冻干粉形式保存。本产品用于糖尿病患者的乙酰乙酸检测。 ...

Method for preparing zirconium-aluminium-carbon ceramic cube material by in-situ reaction heat-pressing

Method for coating nanometer rare earth oxide or composite material thereof catalyst by electrochemical method

The invention relates to the field for coating catalyst by electrochemical method, in particular to a method for coating nanometer rare earth oxide with controllable thickness or composite material thereof catalyst on MAX porous material matrix by using electrochemical principle. The invention adopts the wet chemical method to prepare MAX phase catalyst carrier material with controllable structure and further coats catalyst with controllable thickness on MAX porous material matrix by using electrochemical principle. The nanometer rare earth oxide used for auto-exhaust catalysis or composite material thereof catalyst is used as a target to be coated, the MAX phase porous catalyst carrier material is used as negative electrode, the electrolyte is corresponding nitrate solution with a concentration of 0.5-1.5M, and Pt is used as positive electrode to perform electrochemical coating to obtain nanometer rare earth oxide or composite material thereof catalyst coating with controllable thickness ...

一种稀土铜氧化物陶瓷粉体的制备方法

... 一种稀土铜氧化物陶瓷粉体的制备方法，以相应金属的硝酸盐为氧化剂，以尿素为燃烧剂，采用自蔓延燃烧的方法，其特征在于：以部分醋酸盐取代硝酸盐作为阻燃剂，取代硝酸盐的量摩尔比范围为25～75％，O/F比率范围为0.20～1.00。本发明可以大大降低陶瓷粉体制备中自蔓延燃烧温度，可以通过调节尿素的用量来精确控制自蔓延燃烧温度和速度的方法，大大提高了自蔓延燃烧反应的可控性，并且能够在较低温度得到符合要求形貌的陶瓷粉体。 ...

Nb4AlC3 block ceramic synthesized by hot pressing at in-situ reaction and preparation method thereof

The invention relates to an in-situ reactive synthesized Nb4AlC3 bulk ceramic by hot pressing and a preparation method thereof. The Nb4AlC3 bulk ceramic belongs to a hexagonal system with the space group being P63/mmc, the single-celled lattice parameter a being 3.15, parameter c being 24.22 and the theoretical density being 7.06g/cm<3>. Al and Nb in the crystal structure are combined with a weak covalent bond, thus causing the Nb4AlC3 to generate shear deformation along the base surface (0001) under stress action and grains to easily kink and spall, and then the grains show microscopic plasticity in macroscopic view and can be mechanically processed by common tool steels. The specific preparation method of the single-phase Na4AlC3 is as follows: firstly, niobium powders, aluminum powders and graphite powders are used as materials which are ball milled for 12 to 24 hours under dry condition in a resin tank, then the materials are put in a graphite die for cold molding (10 to 20 MPa) after ...

Ta2AlC nano lamina block ceramic and preparation method thereof

Method for producing ethanol by wild plant starch resource as acorn starch for substituting for grain

The invention relates to a method for preparing alcohol through saccharifying with wild plant starch resources such as acorn. It employs adverse current immersion method, continuous fermentation and raw material absorption dehydrolysis method. Said adverse current immersion method increases removing efficiency; continuous fermentation combines fermentation unit and distill units into one integrated processing device, and strengthens reaction kinetic effect; raw material absorption dehydrolysis method employs acorn powder or starch to prepare waterless alcohol through dehydrolysis, regeneration is avoided, which saves energy consumption. The biological renewable energy can reduce environmental pollution effectively, alleviating energy crisis, and saves grain. The gasoline fuel ethanol is prepared by using non- grain crop, which belongs to agricultural and forest products. The ethanol can be produced in large- scale, which reduces production cost and increase farmers income. So it is of great ...

Composite material of aluminum titanium carbide / titanium diboride, and preparation method

Method for measuring shear strength of machinable ceramics

The method for testing shearing strength of workable ceramics includes 1). using linear cutting process to cut out thin plate samples with various thickness from large block of sintered sample, then polishing them; 2). fixing plate sample between hard steel grippers, centres of upper and lower two grippers are opposite and a through hole through which a hard column punching head can be frictionlessly passed is cut; 3) adopting general material test machine to press hole and using thin plate sample whose relative thickness h/d=0.07-0.1 to determine shearing strength of ternary layer workale ceramics; and 4). using critical load and shearing zone area to calculate shearing strength. Said method is called hole-pressing method, its reliability is strong and operation is simple.

Method for preparing massive compact high-pure single-phase Y2SiO5 ceramic block material at low temperature

The invention relates to a manufacturing technology of novel highly pure Y₂SiO₅ ceramic material, in particular to a manufacturing method for a highly pure massive and compact single-phase Y₂SiO₅ ceramic material. A LiYO₂ additive is added into the mixed raw materials of Y₂O₃ and SiO₂ in a proportion of 0.2-10.0 percent that of total weight of Y₂O₃₂ and LiYO₂. Following a homogenous mixing, the mixture then go through sintering treatment at a temperature between 1250 DEG C and 1600 DEG C for 1-5 hours to obtain highly pure single-phase Y₂SiO₅ powder. The powder is ground then to obtain ultrafine powder and the ultrafine powder is allowed to be fed into high-strength steel moulds for single-phase cooling and isostatic cool pressing to obtain green compact with a relative density of 45-65 percent. Finally the green compact can be sintered ...

Method for coating nanometer rare earth oxide or composite material thereof catalyst by electrochemical method

The invention relates to the field for coating catalyst by electrochemical method, in particular to a method for coating nanometer rare earth oxide with controllable thickness or composite material thereof catalyst on MAX porous material matrix by using electrochemical principle. The invention adopts the wet chemical method to prepare MAX phase catalyst carrier material with controllable structure and further coats catalyst with controllable thickness on MAX porous material matrix by using electrochemical principle. The nanometer rare earth oxide used for auto-exhaust catalysis or composite material thereof catalyst is used as a target to be coated, the MAX phase porous catalyst carrier material is used as negative electrode, the electrolyte is corresponding nitrate solution with a concentration of 0.5-1.5M, and Pt is used as positive electrode to perform electrochemical coating to obtain nanometer rare earth oxide or composite material thereof catalyst coating with controllable thickness ...

Process for preparing titaniferous silicon carbide powder

A Ti3SiC2 powder is prepared from Si, Ti, graphite powder, and NaF or AlF3.NaF (2-10 wt.%) through reaction at 1200-1300 deg.C in inertial atmosphere for 1-4 hr. The added quantity of fluoride is 2-10% and the atom ratio of Si : Ti : C is 3 : 1 : 2. Its advantages are simple process, and high output rate and purity.

一种测试固体材料的粘接强度的方法

The present invention relates to detection technology of bonding strength and is especially the method of detecting bonding strength of solid materials. By means of one simple one-way compression load to produce homogeneous tensile stress or shearing stress in the bonding interface of crossed bonding sample of unlike or the same solid material, the interface tensile strength or shearing strength in determined according to the stress in cracking. The present invention can measure the bonding tensile strength and shearing strength between solid materials, including ceramic and metal, and may be used in evaluating various high strength adhesives.

Preparation method of rare-earth copper oxide ceramic powder body

The preparation method of rare earth copper oxide ceramic powder uses the nitrate of correspondent metal as oxidant, uses urea as burning agent and adopts self-spreading combustion process, and is characterized by that the partial acetate can be substituted for nitrate as fire-retardant, the quantity mole ratio range of substituted nitrate is 25-75% and O/F rate range is 0.20-1.00. Said inventioncan greatly reduce self-spreading combustion temp. in the preparation of ceramic powder, can utilize regulation of urea dosage to accurately control self-spreading combustion temp. and speed so as togreatly raise the controllability of self-spreading combustion reaction and obtain the ceramic powder meeting requirements at lower temp. condition.

TaC-SiC ceramic composite material synthesized by hot pressing at in-situ reaction

The invention relates to a ceramic matrix composite material and a synthetic method thereof, which are concretely an in-situ reactive synthesized TaC-SiC ceramic composite material by hot pressing and a synthetic method thereof. The method aims at solving the problems that the oxidation resistance of TaC is not ideal and loose surface oxide layers are easy to form in an oxidizing atmosphere, and the like. Two composition phases of TaC and SiC are in-situ formed and the percentage content of SiC is 0 to 50vol. percent. The concrete synthetic method is as follows: tantalum powders, silicon powders and graphite powders are used as materials which are ball milled for 10 to 40 hours under dry condition in a resin tank, after sieving the materials are put in a graphite die for cold molding (5 to 20 MPa), and then the materials are sintered in vacuum or a hot pressing furnace introduced with argon, with the sintering temperature of 1950 to 2150 DEG C, heat preserving sintering time of 1 to 2hours ...

Method for preparing massive compact high-pure single-phase Y2SiO5 ceramic block material at low temperature

Method for forming silicide coating on surface of alumina-zirconia-carbon ceramic

The invention relates to a method for forming a silicide coating on the surface of alumina-zirconia-carbon (Zr2Al3C4 and Zr3Al3C5) ceramic, belonging to the technical field of surface engineering. The method comprises the following steps that: solid powder mixture formed by silica powder and sodium fluoride powder in a mixing way is used as a permeable material, alumina-zirconia-carbon ceramic material is embedded in the permeable material, temperature is increased at a speed of 5-30 DEG C/min under the protection of inert gas, the temperature is kept to be 900-1300 DEG C for 0.5-5h, heat dissipation treatment is conducted, a furnace is cooled to room temperature and thereby a zirconium disilicide and silicon carbide coating is formed on the surface of a sample. Under the same oxidization conditions, the oxidation weight increase of the coating is decreased by 1-2 orders of magnitude when being compared with the oxidization weight increase of the alumina-zirconia-carbon ceramic material ...

Method for preparing Hf3AIN ceramic material through in-situ reaction

The invention relates to the preparation technology of high-temperature structural ceramics and particularly provides a method for preparing Hf3AlN ceramic material through in-situ reaction, solving the problem that currently, Hf3AIN ceramic material is difficult to prepare and is impractical. The method includes the steps of: taking Hf powder, Al powder and AlN powder or Hf powder, Al powder and HfN powder at certain stoichiometric proportion as raw materials; ball-milling the raw materials for 5-50h and cold-briquetting the raw materials under 5-20MPa; putting the briquette into a graphite mould; heating at the temperature rising rate of 2-50 DEG C/min in a hot pressing furnace filled with inert gas (such as argon) serving as shielding gas (or under vacuum condition) until the temperature reaches 1,200-1,600 DEG C; and allowing in-situ reaction for 0.1-2h. The hot pressing pressure during the process of preparing the briquette is 20-40MPa and the pressure during the process of preparing ...

Instant liquid-phase pervasion jointing ternary layered ceramic titanium carbon silicification technique

Sheet-like LiFePO4 nanocrystalline powder and method for preparing the same

The invention relates to a lamelliform LiFePO4 nano-crystalline powder with a (020) orientation and a preparation method thereof. The lamelliform crystal size is within 200 nm- 5 micron and the thickness is within 50 nm- 500 nm. The specific preparation method comprises: dissolving the cheap water-soluble ferrite and lithium hydroxide with distilled water in different vessels, diluting the concentrated phosphoric acid with distilled water, mixing the water-soluble ferrite with phosphoric acid solution and slowly pouring the mixture into the lithium hydroxide solution under the strong agitation. The dosages of the water-soluble ferrite, phosphoric acid and lithium hydroxide are controlled as the mol ratio 1:1:(2.5-3). At last the mixture of the three above is transferred into the hydrothermal reaction kettle to preserve heat at a temperature of 120-220 DEG C for 1-10 hours, taking out the product to cool, filter and dry the product so as to obtain the final product. The preparation method ...

Nb4AlC3 block ceramic synthesized by hot pressing at in-situ reaction and preparation method thereof

The invention relates to an in-situ reactive synthesized Nb4AlC3 bulk ceramic by hot pressing and a preparation method thereof. The Nb4AlC3 bulk ceramic belongs to a hexagonal system with the space group being P63/mmc, the single-celled lattice parameter a being 3.15, parameter c being 24.22 and the theoretical density being 7.06g/cm<3>. Al and Nb in the crystal structure are combined with a weak covalent bond, thus causing the Nb4AlC3 to generate shear deformation along the base surface (0001) under stress action and grains to easily kink and spall, and then the grains show microscopic plasticity in macroscopic view and can be mechanically processed by common tool steels. The specific preparation method of the single-phase Na4AlC3 is as follows: firstly, niobium powders, aluminum powders and graphite powders are used as materials which are ball milled for 12 to 24 hours under dry condition in a resin tank, then the materials are put in a graphite die for cold molding (10 to 20 MPa) after ...

一种提高Ti#-[3]AlC#-[2]中温抗氧化性的方法

The present invention relates to antioxidation technology, and is especially method of raising the medium temperature antioxidation performance of Ti3AlC2. Ti3AlC2 is treated in oxidizing atmosphere at 1000-1300 deg.c for 0.5-4 hr to preoxidize and the said oxidizing atmosphere is static or flowing air, oxygen or diluted oxygen. The said process can produce oxide layer well combined with the base body and without holes and cracks, and this can raise the medium temperature antioxidation performance of Ti3AlC2.

Method for preparing zirconia-alumina composite material by way of zirconia-alumina-carbon oxidation

The invention relates to a preparation method for high-performance composite ceramic material, in particular to a method for preparing a zirconia-alumina nano-grained or ultrafine-grained composite material by oxidating ternary zirconia-alumina-carbon compound in situ. The invention solves the problem that the zirconia/alumina nano-grained or ultrafine-grained composite material prepared by the prior part is not practical. Firstly, synthetic zirconia-alumina-carbon ceramic powder is adopted as material, and is ball-milled, heated to 700 DEG C to 1500 DEG C in the air and oxidated in situ for 0 to 100 hours, so that zirconia-alumina composite powder with uniformly mixed nanoscale is prepared; then, the zirconia-alumina composite powder is cold-pressed to form a cake, which is loaded into a graphite mould, the cake is heated to 1000 DEG C to 1600 DEG C and hot-pressed in situ in a hot-pressing furnace filled with inert gas as protective gas (or under vacuum) for 0.5 to 4 hours, and the hot-pressing ...

Method for simulating complex environment in low earth orbit space, and equipment of use

Method for preparing high temperature resistant and antioxidation silicon nitrogen oxygen ceramic at low temperature

The invention relates to a technology for preparing a high-temperature resistant and oxidation resistant dielectric ceramic, in particular to a method for preparing a high-temperature resistant and oxidation resistant silicon-nitrogen-oxygen ceramic at low temperature, which solves the problems of relatively high temperature, long reaction time and so on when the silicon-nitrogen-oxygen ceramic material is prepared by the prior art. The method comprises the following steps: using silicon nitride and silicon oxide with certain stoichiometric proportion as raw materials and using lithium carbonate as a sintering aid; grinding the raw materials for 10 to 30 hours and then filling the raw materials into a graphite mold to be subjected to cold press molding; and sintering the raw materials in a hot pressing furnace introduced with nitrogen and used as a protective atmosphere, wherein the sintering temperature is between 1,400 and 1,600 DEG C and the sintering time is between 0.1 and 1 hour.

In situ reaction heat pressing synthesized V2AlC bulk ceramic and preparation thereof

The invention relates to single-phase block ceramic and a preparation method thereof, in particular to V2AlC block ceramic synthesized by reaction in-situ and heat pressing and a preparation method thereof. The V2AlC block ceramic comprises single-phase V2AlC; the relative density of the single-phase V2AlC prepared by the reaction in-situ and hot pressing technology is 98 to 99 percent; the average crystal grain size length range of the prepared sample is between 49 and 405 Microns; the width range is between 19 and 106 Microns. Vanadium powder, aluminum powder and black lead powder are used as the materials and grinded for 12 to 24 hours in a resin jar under a drying condition, screened and arranged into a black lead die for cold press forming, then sintered in a hot pressing furnace which is vacuum or pumped with argon; the temperature rising speed is 10 to 15 DEG C/min; the sintering temperature is between 1400 and 1700 DEG C; the heat preservation time is between 30 and 60 minutes; ...

Sheet-like LiFePO4 nanocrystalline powder and method for preparing the same

The invention relates to a lamelliform LiFePO4 nano-crystalline powder with a (020) orientation and a preparation method thereof. The lamelliform crystal size is within 200 nm- 5 micron and the thickness is within 50 nm- 500 nm. The specific preparation method comprises: dissolving the cheap water-soluble ferrite and lithium hydroxide with distilled water in different vessels, diluting the concentrated phosphoric acid with distilled water, mixing the water-soluble ferrite with phosphoric acid solution and slowly pouring the mixture into the lithium hydroxide solution under the strong agitation. The dosages of the water-soluble ferrite, phosphoric acid and lithium hydroxide are controlled as the mol ratio 1:1:(2.5-3). At last the mixture of the three above is transferred into the hydrothermal reaction kettle to preserve heat at a temperature of 120-220 DEG C for 1-10 hours, taking out the product to cool, filter and dry the product so as to obtain the final product. The preparation method ...

Porous conductive MAX phase ceramics and preparation method and use thereof

The invention relates to a porous conductive ceramics, in particular to a porous conductive MAX phase (Ti3SiC2, Ti3AlC2 or Ti2AlC) ceramics with a through hole structure, and a preparation method and a use thereof. The porosity of the porous ceramics is adjustable within the range of 20-65%, the ceramics comprises a through hole structure, and the openporosity is more than 85%. The preparation method comprises the steps of taking MAX phase ceramic powder as a raw material, molding, carrying out pressureless sintering in an atmosphere furnace, keeping the sintering temperature at 1200-1400 DEGC, and leading the sintering time to be 0.5-3 hours. The MAX phase conductive ceramics with the through hole structure prepared by the pressureless sintering method can be used as a catalyst carrier material for automobile exhaust purification. The invention can solve the problems of liquid phase, a large number of closed pores in the generated hole and the like during the sintering process by optimizing ...

Method for preparing high-temperature-resisting, oxidation-resisting zirconium-aluminium ceramic powder

Method for evaluating ceramic materials fracture toughness

The invention relates to a method for evaluating fracture toughness property of ceramic material-single tapered notched beam method. The method comprises the following steps of: using a strip-shaped sample (3*4*36 or 3*4*45mm<3>) as a test sample, polishing, and prefabricating a tapered notch with mechanical processing method, wherein the width of the notch is controlled below 300 micrometer, the depth of the notch to a stretching plane are respectively controlled within 3.8-4mm and 0-0.8mm; and measuring the maximum load during loading process using a four point bending experimental device with controllable loading speed, and calculating the fracture toughness property of the ceramic material, wherein the inner span and the outer span of the experimental device are respectively 10mm and 30mm or 20mm and 40mm, and the loading speed is 0.05mm/min or below 0.05mm/min. The invention can simply, conveniently, rapidly and accurately the fracture toughness property of ceramic material, and solves ...

Prepn of composite Ti3AlC2 material reinforcer

The present invention relates to composite Ti3AlC2 material reinforcer. The composite Ti3AlC2 material reinforcer is prepared with Ti powder, Al powder and C powder in the molar ratio of 3 to 1-1.2 to 1.6-2.1 and through ball milling for 10-20 hr to mix, sealing in BN or graphite crucible, heating to 1300-1450 deg.c at temperature raising rate of 5-40 deg.c/min in flowing protecting Ar gas insidea SiC tubular furnace and solid-liquid reaction at the said temperature for 0.5-4 hr. The said process has high product purity, short reaction period, homogeneously distributed granularity, and otheradvantages.

一种提高Ti#-[3]AlC#-[2]、Ti#-[2]AlC及其复合材料抗熔融盐腐蚀方法

The present invention relates to a technique for resisting molten salt corrosion, in the concrete, it is a method for raising Ti3AlC2, Ti2AlC and their composite material resistance to molten salt corrosion, and it is characterized by that the described material can be placed in the oxidative atmosphere to implement surface modification, its teatment temp. is 950-1280 deg.C and treatment time is 0.5-4 hr. After the Ti3AlC2, Ti3AlC and Ti3AlC/Ti2AlC composite material are undergone the process of surface modification treatment in the oxygen-containing at mosphere with 950-1280 deg.C, on their surface a compact oxide layer combined with base body well is formed, so that their surface resistance to molten salt corrosion can be greatly raised.

Enzymological-test acetoacetic acid reagent kit

The enzymological test acetoacetic acid reagent kit contains: disodium hydrogen phosphate-sodium dihydrogen phosphate, disodium complexonate, beta-hydroxybutyric dehydrogenase, magnesium chloride, sodium azide, reducing nicotinaamide adenine dinucleotide and ammonium sulfate. It has long preservation period and is easy to use.

Original position reaction hot pressing synthesis TiB2-NbC-SiC refractory ceramics composite material and preparing method thereof

High-strength and high-conductivity copper alloy

High-toughness and wear-resistant ceramic complex cutter material

The present invention relates to ceramic material, esp the one with TiC, TiN, Ti(C,N), and SiC as matrix and containing high-temp alloy phase. It has its specific composition of agglutinant (0.1-65%), high-temp alloy component (0.1-5%) and matrix (the rest), and it is moulded via thermocompresion or agglomeration. The said ceramic material has both high hardness and good toughness, and is suitable for producing cutting tool.

Method for preapring metal-base composite material reinforced by non-continuous ceramics reinforcing agent

Method for mfg. Cu/Ti3SiC2 composite material by chemical copper plating

Process for preparing titaniferous silicon carbide powder

Ti-Hf-Si-Al-C, Ti-Hf-Al-C and Ti-Zr-Al-C solid solution material and preparation method thereof

The invention relates to a ceramic solid solution material and a preparation method thereof, in particular to a Ti-Hf-Si-Al-C, Ti-Hf-Al-C and Ti-Zr-Al-C solid solution material and a preparation method thereof. The method adopts elemental powder to synthesize Ti-Hf-Si-Al-C (Ti1-xHfx)3(Si1-yAly)C2, Ti-Hf-Al-C (Ti1-xHfx)3AlC2 and Ti-Zr-Al-C solid solution (Ti1-xZrx)3AlC2 in situ, where the numeric area of x is more than 0 and less than or equal to 0.07, and the numeric area of y is more than 0 and less than or equal to 0.10. The method comprises the following steps: firstly, mixing titanium powder, hafnium powder, zirconium powder, silicon powder, aluminum powder and graphite powder which serve as raw materials by a physical mechanical method; filling the mixture in a graphite mold for cold press molding; sintering the mixture in a hot-pressing furnace in which protective atmosphere is introduced to obtain the Ti-Hf-Si-Al-C, Ti-Hf-Al-C and Ti-Zr-Al-C solid solution material. In the invention ...

Zirconium-aluminum-carbon ceramic particle-reinforced copper matrix composite material and preparation method thereof

The invention relates to the field of ceramic particle-reinforced metal matrix composite materials, in particular to a powder metallurgy method for preparing a zirconium-aluminum-carbon ceramic particle-reinforced copper matrix composite material with high conductivity and high wear resistance. Zirconium-aluminum-carbon ceramic particles distributed in a copper matrix are used to prepare the composite material comprising a series of components, wherein the zirconium-aluminum-carbon ceramic content is between 5 and 15 volume percent. The method comprises the following steps of: firstly, milling zirconium-aluminum-carbon ceramic serving as a raw material by using a planetary ball milling method to obtain powder with average particle size of 2 to 5 microns; secondly, mixing the obtained zirconium-aluminum-carbon ceramic powder and copper powder in a predetermined ratio; thirdly, performing further ball milling on the mixed powder by using the planetary ball milling method and filling the mixed ...

High-strength and high-conductivity copper alloy

The copper alloy features that it consists of dispersed silicon titanium-carbide reinforcing phase and copper with the volume fraction of silicon titanium-carbide being 0.005-0.05. after silicon titanium-carbide is dispersed on copper matrix homogeneously and physically, the alloy is formed either through hot pressing and hot isostatic sintering for 0.5-2 hr at 750-1000 deg.c and 20-100 MPa, or through hot extrusion process at 850-950 deg.c. The copper alloy of the present invention has both high strength and high conductivity.

Method for preparing titanium-aluminium-carbon bulk material by in-situ hot-pressing solid-liquid phase reaction

Zirconium titanium carbide particle reinforced silicon aluminum titanium carbide zirconium based composite material and preparation thereof

The invention relates to a ceramic-matrix composite material as well as a preparation method thereof, in particular to a titanium zirconium carbide particle reinforced silica-alumina titanium zirconium carbide matrix composite material and a preparation method thereof. A zirconium titanium carbide particle reinforced silica-alumina titanium zirconium carbide solid solution adopting the in-situ synthesis has a zirconium titanium carbide particle reinforced phase with the volume percentage of 5 to 30 percent; and the preparation method comprises: firstly, taking a titanium powder, a zirconium powder, a silicon powder, an aluminum powder and a graphite powder as raw materials, mixing the materials by a physical mechanical method for 10 to 25 hours, putting the materials in a graphite mould for cold briquetting, with the exerted pressure of 5 to 20MPa, and sintering the materials in a hot pressing furnace input with a protective atmosphere, with a rate of rise of temperature of 5 to 50DEG C ...

Method for uniformly and controllably coating conducting carbon layer at surface of LiFePO4 granule surface

The invention relates to a method for coating an even and controllable deposit carbon layer on the surface of LiFePO4 particles serving as lithium ion battery cathode materials for increasing the LiFePO4 conductivity. The method adopts the concrete preparation processes that: LiFePO4 powders are placed in a constant temperature zone of a chemical vapor deposition furnace, then the air in the furnace is fully discharged for inputting inert gases, after the temperature rises to the set level, a carbon source gas is input for covering a conductivity carbon film on the surface of the LiFePO4 particles evenly, the LiFePO4 coated with the carbon film has excellent conductivity which is increased by five orders of magnitude compared with the condition before coating. The chemical vapor deposition temperature ranges from 580 to 720DEG C, the deposition time is from 1 to 10 hours, and the volume percent of the carbon source gas is between 1 and 20 percent, and a sample deposited with carbon is cooled ...

In situ reaction heat pressing synthesized V2AlC bulk ceramic and preparation thereof

The invention relates to single-phase block ceramic and a preparation method thereof, in particular to V2AlC block ceramic synthesized by reaction in-situ and heat pressing and a preparation method thereof. The V2AlC block ceramic comprises single-phase V2AlC. The relative density of the single-phase V2AlC prepared by the reaction in-situ and hot pressing technology is 98 to 99 percent. The average crystal grain size length range of the prepared sample is between 49 and 405 Microns. The width range is between 19 and 106 Microns. Vanadium powder, aluminum powder and graphite powder are used as the materials and grinded for 12 to 24 hours in a resin jar under a drying condition, and are arranged into a graphite mould for cold press forming after screening. Then the mould is sintered in a hot pressing furnace which is vacuum or pumped with argon. The temperature rising speed is 10 to 15 DEG C/min. The sintering temperature is between 1400 and 1700 DEG C. The heat preservation time is between ...

Method for preparing tantalum-aluminium-carbon ceramic by in-situ heat-pressing/solid-liquid phase reaction

Method for mfg. Cu/Ti3SiC2 composite material by chemical copper plating

A process for preparing Cu/Ti3SiC2 by chemical copperplating includes preparing copperplating solution from CuSO4.5H2O, EDTA2Na, NaOH, 2,2'-bipyridine and HCHD, regulating its pH to 11-13, preheatingto 60-90 deg.C, adding Ti3SiC2 particles (5-40 vol%), chemical copperlating, mixing with copper powder, and sintering in protective atmosphere. Its advantages are high mechanical performance and compactness and low cost.

Porous conductive MAX phase ceramics and preparation method and use thereof

The invention relates to a porous conductive ceramics, in particular to a porous conductive MAX phase (Ti3SiC2, Ti3AlC2 or Ti2AlC) ceramics with a through hole structure, and a preparation method and a use thereof. The porosity of the porous ceramics is adjustable within the range of 20-65%, the ceramics comprises a through hole structure, and the openporosity is more than 85%. The preparation method comprises the steps of taking MAX phase ceramic powder as a raw material, molding, carrying out pressureless sintering in an atmosphere furnace, keeping the sintering temperature at 1200-1400 DEG C, and leading the sintering time to be 0.5-3 hours. The MAX phase conductive ceramics with the through hole structure prepared by the pressureless sintering method can be used as a catalyst carrier material for automobile exhaust purification. The invention can solve the problems of liquid phase, a large number of closed pores in the generated hole and the like during the sintering process by optimizing ...

Preparation method of porous conductive LiFePO4 positive plate used in lithium ion battery

The invention relates to the preparation technology of phosphate type positive plate used in lithium ion battery, in particular to a preparation method of adhesive free porous conductive LiFePO4 positive plate used in lithium ion battery. The method includes that LiFePO4 positive material powder subject to low temperature sintering and cold press moulding forms a porous structure, and then chemical vapor deposition method is adopted to uniformly coat a conductive carbon film on the LiFePO4 particle surface in porous structure, so as to obtain the porous conductive LiFePO4 positive plate. The invention can prepare the porous conductive LiFePO4 positive plate without using adhesive or solvent dissolving adhesive. The positive plate prepared by adopting the method has good conductivity and high discharge specific capacity. The invention has simple process and low positive plate manufacturing cost, greatly shortens the traditional process flow and solves the problems that the conventionalLiFePO4 ...

Diffusion connection technique for ternary layered ceramic aluminum titanium carbide

The invention relates to the technology of ceramics joining, in particular to a novel technology of diffusion bonding of ternary layered carbide Ti3AlC2, which is characterized in that: high temperature resistant Ti3Al (Si) C2 solid solution is generated at the interface and no brittle phase is produced, thus solving the technical problem of poor jointing quality of ternary layered carbide Ti3AlC2. Simple substance Si is sputtered at the surface of ternary layered carbide Ti3AlC2 that is to be weld with thickness between 4-10 Mum and the sandwich structure of Ti3AlC2/Si/Ti3AlC2 is formed. A check bar is put into a hot pressing furnace, diffused and bonded under the protection of argon. The process condition is that: welding temperature is 1300-1400 DEG C, welding pressure is 2-5 MPa and welding time is 120-240 min. The diffuse and welded joint obtained by the method of the invention has no new reaction phase at the interface, avoids the effect of new brittle phase on joint strength; besides ...

In-situ hot pressing solid-liquid phase reaction process to prepare silicon titanium-carbide material

The preparation process features that the materials Ti, Si and graphite powder in the non-stoichiometrical Ti-Si-C ratio of 1.5-2.5 to 1 to 1.7-2 are mixed and sintered at 1500-1650 deg.C temperatureand 35-45 MPa pressure for 0.2-4 hr under the protective inert gas. The process can prepare Ti3SiC2 with high purity and stable mechanical performance and is suitable for production in industrial scale.

Process for preparing silicon titanium-carbide material by in-situ hot pressing solid-liquid phase reaction

Solid oxide fuel cell connector material used in fuel cell

The invention belongs to the field of energy source engineering and technology, and in particular relates to a novel processable ceramic connector material, namely titanium silicon carbide and a modified titanium silicon carbide material, of solid oxide fuel cells (SOFCs) used in fuel cells. The titanium silicon carbide is ternary laminar ceramic Ti3SiC2; and the modified titanium silicon carbideis formed by solid solution modification, namely solid solution of Al is performed at a Si position, or the solid solution of Nb is performed at a Ti position and the solid solution of the Al is performed at the Si position simultaneously. The anti-oxidation performance and conductivity in a working environment of the material are equivalent to those of an alloy connector material; the thermal expansion coefficient of the material is 9.1+/-0.5*10<-6>k<-1> and is close to the thermal expansion coefficient 10.5*10<-6>k<-1> of electrolyte yttria stabilized zirconia (YSZ); and the material is easy to ...

一种脆性镀膜层弹性模量和强度的测试方法

The present invention discloses the measurement method of elastic modulus and strength of fragile coating. Based on the variation of beam sample before and after coating in bending deflection under bending load, the formula of f2.I=f1.I1 for the deformation of the sample before and after coating under the same load, equivalent cross theory of composite beam in material mechanics and three-point bending formula, the inertia moment of the coated beam sample, further the ratio between the coating elastic modulus and the substrate elastic modulus, the ratio between deflection values before and after coating and the elastic modulus of the coating are found out. Then, through determining the elastic modulus of the substrate and the coating and calculating the stress distribution along the thickness direction, the maximum surface stress corresponding to the coating cracking as the strength of the coating is found out. The present invention can evaluate the elastic modulus and breaking strength ...

三条线软板电路的led光源

本实用新型属于LED灯具技术领域，公开了三条线软板电路的LED光源，包括LED灯、三条线软板电路、电阻、正极插头、负极插头和电源板，三条线软板电路包括表层膜或阻焊油层、耐高温PET层、热熔胶层、第一条铜层、第二条铜层和第三条铜层，第一条铜层、第二条铜层和第三条铜层并列设置通过热熔胶层覆膜在耐高温PET层上表面，第二条铜层由相互隔断的多段铜层组成，相邻段铜层之间呈竖横竖隔离带。本实用新型实现了能够简化加工及节约成本。

一种两条线软板电路的led光源

本实用新型属于LED灯具技术领域，公开了一种两条线软板电路的LED光源，包括LED灯、两条线软板电路、电阻、插头和电源板，所述LED灯仅由LED灯芯片和荧光胶组成，LED灯芯片嵌合在荧光胶内。本实用新型实现了能够简化加工及节约成本。

一种土壤检测用原子荧光光度计

本实用新型公开了一种土壤检测用原子荧光光度计，属于测量技术领域，所述土壤检测用原子荧光光度计包括机体、密封盖和荧光光度计，所述机体顶部一端通过铰链活动连接有密封盖，所述机体内腔固定安装有荧光光度计，所述荧光光度计底部一端通过导线固定连接有小型打印机，所述小型打印机的信号输入端与荧光光度计的信号输出端相连，所述荧光光度计底部通过导线固定连接有电池，所述电池的电流输出端与荧光光度计的电流输入端电性相连。本实用新型结构简单，操作方便且使用效果好，且更加便携于进行携带，使用更加的方便和省力，且在户外进行使用时，机体可变成板凳形式，方便使用者坐在上面，使用更加的人性化。

High-entropy perovskite-type electromagnetic wave absorbing material and preparation method thereof

The present invention belongs to the technical field of electromagnetic wave absorbing materials. A high-entropy perovskite-type electromagnetic wave absorbing material and a preparation method therefor are disclosed in the present invention. A preparation method for a perovskite-type electromagnetic wave absorbing material is disclosed which comprises mixing cobalt salt, iron salt, nickel salt, lanthanum salt, manganese salt, chromium salt, an agent such as citric acid, a dispersant such as ethylene glycol and a solvent such as water to form a sol-gel precursor, drying the precursor and calcining to form the perovskite-type electromagnetic wave absorbing material. The material formed is a lanthanum oxide material, La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3.