1165 results about "Sintering" patented technology

The invention discloses an integrated preparation method of a SiC-based composite material environment barrier coating in the technical field of aviation thermal structure materials, which comprises the following steps: cleaning a substrate, carrying out vacuum impregnation of phenolic resin and curing, coating Si slurry to form a bonding layer, coating rare earth silicate slurry to form a barrier layer, and drying to obtain the SiC-based composite material environment barrier coating. And finally carrying out high-temperature heat treatment in an inert atmosphere. According to the method, through an integrated slurry coating and gradient curing process, the performance of a base body is protected, and meanwhile efficient preparation of the coating is achieved; by adopting an integrated slurry coating and gradient curing technology and combining with an optimized medium-temperature sintering process, the matrix performance is effectively protected while the compactness of the coating is ensured, the bonding strength and interface stability of the coating are improved through the design of the phenolic resin transition layer and the silicon bonding layer in cooperation with the rare earth silicate barrier layer, and the bonding strength of the coating is improved. And the coating shows excellent protection performance in a high-temperature corrosion environment.

The invention relates to the technical field of intelligent sintering, and discloses a rare earth magnet intelligent sintering production line and a control system, and the system comprises a temperature data collection module, a temperature gradient evaluation module, a temperature change rate fitting module, a heating power adjustment module, a directional heat energy compensation module and an optimized heating instruction generation module. Temperature distribution information in the sintering furnace is obtained; evaluating real-time temperature gradients of different positions in the sintering furnace, and comparing the real-time temperature gradients with a preset gradient threshold value to identify a temperature abnormal region in the sintering furnace; fitting the temperature change rate of the temperature abnormal area; the material phase change critical parameters of the rare earth magnet in the current sintering stage are combined to adjust the heating power of the temperature abnormal area; performing directional heat energy compensation on the temperature abnormal region to obtain a power compensation amount; superposing the power compensation amount and the reference power of the sintering furnace to generate an optimized heating instruction; the intelligent sintering control efficiency of the rare earth magnet can be improved.

The invention discloses a preparation method and application of monolithic BiVO4 photocatalytic foamed ceramic. The method comprises the following steps: 1) preparing composite slurry containing BiVO4 powder, an organic additive and a reinforced phase; (2) uniformly attaching the composite slurry to the organic foam skeleton by adopting an impregnation method; 3) performing drying and heat treatment to remove organic components; and 4) performing high-temperature sintering to form the three-dimensional communicated porous structure. Through the structure-function integrated design, the problems that a traditional powder catalyst is difficult to recover, the activity of an immobilized catalyst is low and a supported catalyst is easy to fall off are solved. The obtained product is high in porosity, the compressive strength is larger than or equal to 0.1 MPa, the specific surface area is larger than or equal to 0.1 m < 2 > / g, visible light can be efficiently utilized for degrading emerging organic pollutants in water, and the degradation rate reaches 20-99%. The material has no nano-particle leakage risk, has excellent mechanical strength, chemical stability and engineering applicability, and provides a feasible scheme for large-scale application of a photocatalytic water treatment technology.

The invention relates to a bionic Al / SiC composite material with a three-dimensional network multilevel structure and a preparation method of the bionic Al / SiC composite material, and belongs to the technical field of new material preparation. According to the method, through the collaborative process of freeze casting and organic foam impregnation, the problem that in the prior art, the multilevel aperture and the complex network structure are difficult to cooperatively regulate and control is solved. The preparation method comprises the following specific steps: preparing tert-butyl alcohol-based ceramic slurry, impregnating the slurry with polyurethane foam, performing freeze casting molding, removing a solvent through freeze drying, performing high-temperature sintering to form SiC ceramic with a three-dimensional reticular hierarchical pore structure, and finally preparing the Al / SiC composite material through a vacuum pressure infiltration process. Wherein a sintering aid is added into the slurry, so that the sintering temperature is obviously reduced; the specification (40-60 ppi) of polyurethane foam, the solid phase content (20-30 vol.%) of slurry, the freezing speed (0-90 DEG C) and the content (5-20 wt.%) of a sintering aid are regulated and controlled. And the cross-scale collaborative design of micron-scale directional holes and millimeter-scale mesh holes is realized. The Al / SiC composite material prepared by the invention has the advantages that the compressive strength, fracture toughness and other properties are obviously higher than those of the traditional single-aperture porous ceramic, and the Al / SiC composite material is suitable for the fields of manufacturing and energy absorption of precise instruments, electronic packaging and optical devices.

The invention relates to the technical field of non-oxide ceramic-based composite materials, in particular to Fe-N-based high-entropy nitride ceramic as well as a preparation method and application thereof. The method comprises the following steps: by taking iron powder as a sintering aid, mixing (Hf < 0.2 > Zr < 0.2 > Ti < 0.2 > Nb < 0.2 > Ta < 0.2 >) N high-entropy powder with the iron powder, and carrying out ball milling treatment to obtain ball-milled powder; and under the oxygen-free condition, the ball-milled powder is subjected to sintering treatment, transformation from the loose ball-milled powder to compact and uniform solid solution ceramic is achieved in the sintering treatment process, and the Fe-N-based high-entropy nitride ceramic is obtained. According to the method, a nitride thermal reduction method sintering process is adopted, energy is provided for densification of the Fe-N-based high-entropy nitride ceramic by utilizing reaction heat release of the (Hf0. 2Zr0. 2Ti0. 2Nb0. 2Ta0. 2) N high-entropy powder and the iron powder, the sintering temperature is reduced, energy is saved, and the defect that densification needs to be carried out under a high-temperature condition in the prior art is overcome.

The invention relates to the technical field of metal wire processing, and discloses a high-performance metal wire plastic coating process for aerospace engineering, which comprises the following steps: carrying out base material type selection on a metal wire, and carrying out surface treatment of precise cleaning, etching and depth gradient activation; a Ti-Cr alloy and graphene-copper composite transition layer is deposited through a magnetron sputtering technology, and a multi-layer coating structure is formed through electrostatic spraying of a base coating, a fluidized bed dipping function layer and high velocity oxy-fuel spraying of a nano composite coating in sequence; the molybdenum-gold composite sealing layer is prepared by adopting an electric arc spraying technology, and is subjected to vacuum ultraviolet curing enhancement, high-temperature gradient annealing, gradient sintering and vacuum curing treatment; and heat radiation on the surface of the coating is enhanced through laser-induced micro-nano structure regulation and silicon nitride film sputtering. Through collaborative optimization of base material treatment, coating construction, function strengthening and quality control, the interface bonding strength, the comprehensive performance and the environmental adaptability of the spaceflight metal wire coating are remarkably improved, and the service life of the spaceflight metal wire coating is remarkably prolonged.

The invention discloses a double-component reinforced 5Y-PSZ dental ceramic material and a preparation method thereof, and relates to the technical field of ceramic material preparation. The method comprises the following steps: mixing ZrCl4 and deionized water, and dropwise adding an ammonia water solution to prepare m-ZrO2 nano ceramic powder; zrOCl2. 8H2O, Y (NO3) 3.6 H2O and deionized water are mixed, the m-ZrO2 nano ceramic powder and polyethylene glycol 2000 are added, and the material is prepared through calcination, spray granulation, hot-pressing presintering and high-temperature sintering. According to the 5Y-PSZ dental ceramic material disclosed by the invention, the nano-scale m-phase ZrO2 is adopted as a reinforcing material and is dispersed and distributed inside the 5Y-PSZ, and through volume expansion generated by t-m phase change of the m-phase ZrO2, the anti-aging performance is guaranteed, and meanwhile, the reinforcement of the 5Y-PSZ dental ceramic material is realized. The invention solves the problem of insufficient strength of the 5Y-PSZ dental ceramic material in the prior art.

The invention discloses medium-entropy MAB-phase ceramic powder and a preparation method thereof, and belongs to the technical field of ceramic material preparation. The chemical formula of the ceramic powder is (Cr1 / 3Mn1 / 3Fe1 / 3) 2AlB2, and the ceramic powder is structurally characterized in that three transition metal atoms of Cr, Mn and Fe are in random solid solution distribution at an M position. The preparation method of the material comprises the following steps: taking Cr powder, Mn powder, Fe powder, Al powder and B powder as raw materials, burdening according to a stoichiometric molar ratio in a chemical formula (Cr1 / 3Mn1 / 3Fe1 / 3) 2AlxB2 (wherein x is equal to 1.0-1.3), uniformly mixing, and sintering in a non-pressure tube furnace by adopting a two-stage heating sintering process. And crushing, drying and sieving the sintered product to obtain the ceramic powder. According to the invention, excessive aluminum powder is added to compensate high-temperature volatilization, and a two-stage sintering process is combined, so that the generation of an impurity phase is effectively inhibited, and a high-purity target product is successfully prepared. The synthesis method is simple in process, low in equipment requirement and suitable for large-scale production, and a material basis is provided for application of the medium-entropy MAB phase ceramic in the fields of electromagnetic functions, high-temperature environments and the like.

The invention relates to the technical field of architectural ceramics, in particular to a gangue-doped ceramic tile and a preparation method thereof.The gangue-doped ceramic tile comprises a green body layer, a ground coat layer, a decorative layer and a glazed layer which are sequentially arranged from bottom to top; the green body layer is prepared from the following raw materials in percentage by mass: 6 to 12 percent of bentonite, 1 to 5 percent of Qingshan soil, 3 to 6 percent of polishing mud, 6 to 12 percent of waste brick powder, 4 to 8 percent of green gangue, 5 to 15 percent of chinastone, 20 to 30 percent of feldspar, 1 to 3 percent of recycled blank material, 2 to 5 percent of snail mountain soil, 8 to 15 percent of sandstone, 3 to 6 percent of washed white mud, 5 to 15 percent of coal gangue and 2 to 5 percent of grey gangue; the chemical components of the polishing mud, the waste brick powder, the recycled blank material and the coal gangue respectively comprise SiO2, Al2O3, Fe2O3, TiO2, CaO, MgO, K2O and Na2O. According to the gangue-doped ceramic tile and the preparation method thereof, the raw materials of the green body layer are improved, so that the firing temperature is reduced, the firing period is shortened, low-temperature fast firing is realized, and meanwhile, the production cost is low, the antifouling property is excellent, and the strength is high.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The invention discloses a synergistic phase change reinforced dental zirconia material and a preparation method and application thereof, and relates to the technical field of ceramic materials.The preparation method comprises the following steps that a zirconium oxychloride solution and a polyvinyl alcohol solution are mixed, dried and then subjected to heat treatment, and ZrC ceramic powder is obtained; then mixing with yttria-stabilized zirconia (Y-PSZ) to obtain composite powder; the composite powder is subjected to hot pressing sintering and cooling, and a pre-sintered body is obtained; introducing Ar-O2 mixed gas, and carrying out controllable oxidation to obtain an oxidation phase change reinforced pre-sintered body; and carrying out high-temperature sintering to obtain the synergistic phase change reinforced dental zirconia material. The invention further discloses the synergistic phase change reinforced dental zirconia material and application of the synergistic phase change reinforced dental zirconia material in preparation of dental products. According to the method, ZrC is introduced, and a pressure stress field formed by crystal transformation in ZrC oxidation and high-temperature sintering processes is utilized, so that the yttrium oxide stabilized zirconia dental ceramic is strengthened, and the mechanical strength of the yttrium oxide stabilized zirconia dental ceramic is remarkably improved.

The utility model belongs to the field of protection technology design, and particularly relates to a back thorn type explosion-proof composite structure. The negative Poisson's ratio composite board sequentially comprises back thorns, a ceramic layer, a PE board and a negative Poisson's ratio structure from top to bottom. The back thorns are hollow pipes with closed upper ends and are uniformly distributed above the ceramic layer in a gluing and cutting manner, the ceramic layer is connected with the PE plate on the lower layer in a bonding manner, and the PE plate is connected with the negative Poisson's ratio structure on the bottom layer in a cutting sintering or bonding manner. According to the back thorn type composite anti-explosion protection equipment, the back thorn type hollow pipe structure is used, and the protection range of the protection equipment is effectively enlarged. The combination sequence is arranged according to the protection characteristics of the ceramic, the PE plate and the negative Poisson's ratio material, and respective effects are exerted to the maximum extent.

The invention discloses a preparation method of a foamed thermal-insulation ceramic decorative plate in the technical field of building decorative materials. The method comprises the following steps: carrying out ball milling, spray drying, granulating and ageing on raw materials such as ceramic waste and kaolin; mixing and dispersing the aerogel-hydrogel gradient core-shell structure composite modified material and ceramic particles, and sieving to obtain composite powder; compounding sodium bicarbonate and azodicarbonamide with a foaming agent, mixing the foaming agent with the composite powder, and adding a surfactant and a dispersing agent to adjust the viscosity so as to prepare expandable ceramic slurry; the slurry is injected into a mold and coated with low-temperature glaze, and stepped heating sintering is conducted through a tunnel kiln and comprises the steps of preheating glue discharging, primary foaming, secondary sintering, gradient cooling and the like. The thermal insulation performance, the mechanical strength, the weather resistance and the decoration performance are synergistically improved, and the product is low in heat conductivity coefficient, high in compressive strength, excellent in ultraviolet aging resistance, firm in decoration layer combination and suitable for building outer walls and other scenes.

The invention discloses ceramic containing an air cooling structure and a preparation method and application thereof. The method comprises the following steps: uniformly mixing a sintering aid and ceramic powder, embedding the mixture into a template for pre-pressing molding, sintering at high temperature, and removing the template by adopting a high-temperature oxidation method (800-1000 DEG C, 1-3 hours) combined with a sand blasting auxiliary method (the sand blasting pressure is 0.2-0.8 MPa, and the sand blasting time is 1-5 minutes) to form a through air cooling channel; for ceramic powder easy to react with the template, spraying a boron nitride coating of 5-20 microns on the surface of the template to prevent interface reaction; various sintering modes (such as air pressure sintering and spark plasma sintering) and template shapes (such as a straight-through type and a spiral type) are supported, the structural controllability is good, channels are removed cleanly, and the process is simple; the obtained ceramic has excellent thermal management capability while maintaining high density and mechanical properties, and is suitable for high thermal load environments such as hot end parts of aerospace engines and the like.

The invention discloses a high-temperature-resistant inorganic antibacterial ceramic glaze and a preparation process, and relates to the technical field of ceramic glaze preparation, the glaze is composed of a basic glaze and a zinc oxide-doped cerium dioxide inorganic antibacterial agent, and the basic glaze comprises feldspar, quartz, kaolin, calcite and talc. The preparation process comprises the following steps: mixing the raw materials, carrying out wet ball milling, adding the antibacterial agent and the dispergator, stirring at a high speed, sieving to remove iron, aging, glazing and sintering at a high temperature. In the process, an iron removal integrated unit integrating a two-stage vibration screening function and an automatic iron scraping function is adopted, and efficient and continuous iron removal operation is achieved. The obtained glaze can resist high-temperature sintering of 1150-1200 DEG C, the glaze surface is smooth and uniform, the glaze surface has lasting and efficient broad-spectrum antibacterial performance, glaze surface defects caused by iron impurities are effectively avoided, and the product yield and quality stability are improved.

The invention provides a dark metal modified lithium orthosilicate-based thermochemical heat storage material as well as a preparation method and application thereof, and belongs to the technical field of energy and material science. The components of the heat storage material comprise lithium orthosilicate and dark metal, the proportion of the dark metal in the heat storage material is 2-10 mol%, and the source of the dark metal comprises one or more of manganese dioxide, ferric oxide, nickel oxide and copper oxide. Metal ions introduced into the obtained dark metal modified lithium orthosilicate-based thermochemical heat storage material have the effects of promoting the ion migration rate and resisting material sintering, and specifically, the heat storage density and the cycling stability of the material are remarkably enhanced. In addition, due to the introduction of the dark metal oxide, the color of the heat storage material is remarkably deepened, the solar spectrum absorptivity is greatly improved, the light absorption performance of the material is greatly enhanced, and the heat storage material has higher photo-thermal conversion efficiency and is more suitable for a concentrating solar energy storage system.

The invention provides a ceramsite proppant as well as a preparation method and application thereof. The method comprises the following steps: grinding a coal gangue raw material, pre-sintering, cooling and then grinding again; grinding the tungsten tailing sand, the low-grade bauxite, the carbide slag and the clay; grinding after mixing the raw materials; the raw materials comprise 45-60 parts of low-grade bauxite, 20-35 parts of pre-sintered coal gangue, 15-20 parts of tungsten tailing sand, 1-5 parts of carbide slag and 7-14 parts of clay; the total amount of the low-grade bauxite, the pre-sintered coal gangue and the tungsten tailing sand is 100 parts; granulating and drying; carrying out first sintering at 800-950 DEG C; second sintering is conducted at the temperature of 1050-1200 DEG C; and naturally cooling to obtain the ceramsite proppant. The technical problem to be solved is how to realize high-valued utilization of mine solid waste and low-grade bauxite, reduce dependence on high-quality bauxite and production cost, reduce sintering energy consumption and carbon emission, reduce product body density and improve key performance such as strength and sphericity of the proppant by optimizing raw material combination and a preparation process. And the requirements of oil and gas field fracturing operation are met.

The invention discloses a method for preparing foamed ceramic through low-temperature sintering and a product prepared through the method, and the foamed ceramic with pyroxene minerals as a main crystal phase is prepared through low-temperature sintering through silicon carbide-desulfurization slag composite foaming, szaibelyite fluxing and crystal phase regulation and control. Therefore, the composite closed pore system foaming ceramic material with high mechanical property and closed pore property is obtained. Low-cost minerals and solid wastes are adopted as main raw materials, so that the production cost of the foamed ceramic is effectively reduced, and a solid foundation is laid for large-scale industrial application of the foamed ceramic; meanwhile, efficient resource utilization of solid waste is achieved, remarkable economic and environmental benefits are achieved, and the method plays an important role in promoting industrial circular economy development and ecological environment treatment.

The invention discloses an anti-sticking coating of a graphite boat plate for hard alloy sintering as well as a preparation method and application of the anti-sticking coating, the anti-sticking coating comprises zirconium oxide, rare earth oxide and a cobalt corrosion resistant phase, and the ratio of the zirconium oxide to the rare earth oxide to the cobalt corrosion resistant phase in the anti-sticking coating is (10-20%): (60-80%): (10-20%); the rare earth oxide can maintain zirconium oxide in a stable tetragonal phase in the sintering process and the cooling process, it is guaranteed that a sample does not have phase change, the cobalt corrosion resisting phase can resist corrosion of cobalt steam in the compact sintering process, the anti-sticking coating can balance the difference value of the thermal expansion coefficient of the coating and the thermal expansion coefficient of the graphite surface, and therefore the quality of the compact is improved. Stress generated in the heating or cooling process is reduced, the coating is prevented from cracking, and the service life of the boat is prolonged; and the coating structure is fixed, powder does not need to be replaced in the spraying process, and the spraying efficiency is improved.

The invention relates to the technical field of sewage treatment, and particularly discloses a high-porosity slow-release microelement anti-mineralization sulfur autotrophic denitrification filter material and a preparation method thereof. The sulfur autotrophic denitrification filter material is of a core-shell structure, a complex of sulfur, volcanic rock micro powder and a curing fungicide is used as an inner core, and a hydrophobic polymer coating layer and a porous ceramic bonding layer are sequentially coated on the surface of the inner core; the hydrophobic polymer coating layer is a hydrophobic breathable composite film formed by crosslinking a polydimethylsiloxane prepolymer and calcium alginate. The volcanic rock natural trace elements are utilized to realize waste control by waste, surface mineralization is effectively prevented through the hydrophobic middle layer, the activity of the microbial inoculum is protected in combination with a low-temperature flexible sintering process, and the whole device has the advantages of high porosity, light weight, quick start, long service life, low backwashing energy consumption and the like. Compared with the prior art, the invention has remarkable innovativeness and creativity in the aspects of structural design, material selection and process integration.

The invention discloses a preparation technology of Si3N4 ceramic with high thermal shock resistance and oxidation resistance, and belongs to the technical field of high-temperature structural ceramic. The Si3N4 ceramic takes MgO and Yb2O3 as doping agents, the doping amount accounts for 4wt%-16wt% of the mass of a Si3N4 matrix, and the Si3N4 ceramic is prepared through a vacuumizing pressure sintering process. After the ceramic is subjected to air cooling and water quenching thermal shock at the temperature difference of 625-1225 DEG C, the bending strength of the ceramic has an ascending trend, and the bending strength of the ceramic has a slight reduction trend when the temperature difference of water quenching thermal shock is 1425 DEG C. A common sintering furnace is adopted to simulate a high-temperature oxidation environment, the oxidation temperature range is set to be 1000-1400 DEG C, and by analyzing a high-temperature oxidation weight gain curve, the Si3N4 ceramic is low in oxidation rate constant and high in oxidation activation energy, and the oxidized ceramic has stable bending strength, which indicates that the ceramic has excellent oxidation resistance in the high-temperature environment. The problem that the performance of the traditional Si3N4 ceramic is easy to attenuate in high-temperature circulation and oxidation environments is solved, and the Si3N4 ceramic can be widely applied to high-temperature service parts such as high-temperature cutting tools and aero-engine guide blades.

The invention provides base metal main grid slurry, a preparation method thereof and a photovoltaic cell. The base metal main grid slurry comprises 3-8 parts by mass of nickel powder, and the surface of the nickel powder is coated with a modified component; 0.5-1 part by mass of first glass powder; 0.5 to 1.5 parts by mass of second glass powder; 13-16 parts by mass of an organic phase; 0.2 to 0.5 part by mass of an organic auxiliary agent; 15-25 parts by mass of a first silver powder; and 45-60 parts by mass of a second silver powder. The base metal nickel is used for replacing part of silver powder, the wettability is improved through surface coating, meanwhile, glass elements are optimized, the glass softening point is reduced, the paste can be sintered at the low temperature, close combination of silver particles is facilitated, and the density and conductivity of a conducting layer are improved. According to the technical scheme, the sintering is compact, the conductivity is slightly higher than that of pure silver paste, and the effects that the efficiency is equal to that of the silver paste and the tension is slightly lower than that of the pure silver paste are achieved.

The invention discloses a three-dimensional graphene copper composite material based on in-situ interface chemical bonding and a preparation method and application of the three-dimensional graphene copper composite material, relates to the technical field of metal-based composite materials, and solves the problems of graphene dispersion and interface bonding. The preparation method of the three-dimensional graphene copper composite material comprises the following steps: dissolving soluble copper salt and an organic ligand in water to form a complex solution, adding copper powder into the complex solution, uniformly mixing, and drying to obtain precursor coated copper powder; and carrying out spark plasma sintering or vacuum hot pressed sintering on the precursor coated copper powder to obtain the copper powder. A three-dimensional interpenetrating continuous network formed by graphene is arranged in the prepared three-dimensional graphene copper composite material, the interface of the graphene and a copper matrix is a chemical bonding interface, the comprehensive performance is excellent, and the composite material has high conductivity (gt; 103% IACS) and a high strength (gt; the comprehensive performance of the composite material is far better than that of a composite material prepared by a traditional method, and the composite material is suitable for high-end electric conduction, heat conduction and structural function integrated components.

The invention provides a double-sided conduction AMB ceramic substrate and a manufacturing method thereof, and belongs to the technical field of ceramic substrates for power modules. The manufacturing method comprises the following steps: punching holes in a ceramic substrate; filling conductive metal slurry into the holes by using a screen printing machine and sintering at high temperature; brazing materials are printed on the two faces of the ceramic; the copper layer and the ceramic layer are laminated and then subjected to vacuum brazing; manufacturing a circuit; etching the solder layer of the AMB line groove to expose the ceramic; performing surface treatment; laser cutting; and conducting test and inspection. Two-sided conduction is realized through metal slurry hole filling and a high-temperature sintering process, the problem that conduction of an upper copper layer and a lower copper layer of a traditional AMB ceramic substrate cannot be realized is solved, the assembling size of a power module is reduced, the three-dimensional integration requirement of a high-end module is met, meanwhile, the technological process is reasonable, and the production cost is reduced.

The invention discloses a high-performance PbTe-PbS thermoelectric material and a charge balance doping preparation method thereof, and relates to the technical field of thermoelectric materials, Pb particles, Sb particles, Te blocks, S sheets and Ag strips are respectively weighed according to the molar ratio of 0.95: 0.033: 0.9: 0.1: 0.008 and then are loaded into a quartz tube for vacuum tube sealing, and the high-performance PbTe-PbS thermoelectric material is obtained through box-type furnace sintering, cold water quenching, box-type furnace annealing, cold water quenching and rapid hot pressing furnace sintering in sequence. The Sb, S and Ag co-doped PbTe thermoelectric material is obtained. According to the method, a Pb vacancy and an Ag gap are introduced through charge balance doping of Sb2Te3 to dynamically regulate and control chemical potential, the problems of PbS precipitation and carrier transport blocking of an n-type high-concentration doped PbTe-PbS material system are solved, the wide-temperature-range thermoelectric figure of merit of the small-bandwidth PbTe-PbS thermoelectric material is greatly improved, the process is stable and can be scaled, and technical support is provided for commercialization of PbTe-based thermoelectric devices.

The invention discloses a high-thermal-conductivity aluminum nitride ceramic substrate based on dynamic pressure and a preparation method thereof, and the preparation method comprises the following steps: step 1, filling aluminum nitride ceramic powder into a mold, heating to a pre-sintering temperature for pre-sintering, and cooling to obtain a pre-sintered green body; the pre-sintering temperature is 1300 to 1600 DEG C; basic static pressure is loaded in the heating stage, and after the presintering temperature is reached, dynamic pressure is superposed for heat preservation for 1-300 min; step 2, raising the temperature of the pre-sintered green body to a sintering temperature, and sintering; the sintering temperature is 1600 to 2100 DEG C; basic static pressure is loaded in the heating stage, and after the sintering temperature is reached, dynamic pressure is superposed, and heat preservation is conducted for 1-600 min; step 3, carrying out heat treatment on the sintered ceramic green body to obtain the required ceramic substrate after heat treatment; the performance uniformity of the AlN ceramic structure can be effectively improved through mutual cooperation of pre-sintering and sintering under dynamic pressure, the density of the ceramic is improved, the heat conductivity of the ceramic substrate is improved, and the preparation process and the process period are shortened.

The invention discloses a vertical sintering method for improving EuBCO high-temperature superconducting target material component uniformity, and belongs to the field of superconducting target material preparation. The cylindrical EuBCO target blank is vertically fixed to the center of an alumina crucible, the axis of the cylindrical EuBCO target blank is made to be perpendicular to the bottom face of the crucible, and sintering is conducted in the oxygen atmosphere at the temperature of 900-950 DEG C. Traditional surface contact is replaced by point / line contact, the contact area is reduced by more than or equal to 80%, and the gas diffusion retardation effect of the contact surface is eliminated; meanwhile, oxygen permeation and CO2 diffusion are enhanced through the exposed side faces, and generation of impure phases such as BaCO3 and BaCuO2 is inhibited. The XRD contact ratio of the two end faces of the sintered target material is larger than 99%, and the problem of composition segregation caused by traditional horizontal sintering is solved. The method does not need a crucible coating or an isolating layer, and is low in cost and free of secondary pollution.

The invention discloses a SbBr co-doped argyrodite type solid electrolyte and a preparation method thereof.The preparation method comprises the steps that Li2S, LiCl, P2S5 and SbBr3 are weighed according to the stoichiometric ratio and then subjected to ball milling treatment, and mixed powder is obtained; the mixed powder obtained in the step S1 is subjected to compression molding and placed in a muffle furnace to be heated and calcined, and a solid-phase reaction is conducted; and after the reaction is finished, naturally cooling to room temperature, and grinding to obtain the SbBr co-doped argyrodite type solid electrolyte. According to the preparation process of the argyrodite type solid electrolyte, a traditional solid-phase sintering process is adopted, the synthesis process is simple, and the repeatability is high. The ionic conductivity of the argyrodite type solid electrolyte prepared by the process can reach 10.4 mScm <-1 > at room temperature. The argyrodite type solid electrolyte prepared by the invention has high ionic conductivity and excellent air stability, and meets the requirements of industrial large-scale production. When the solid-state electrolyte provided by the invention is assembled into an all-solid-state battery, the cycle life of the all-solid-state battery can be remarkably prolonged due to good compatibility with lithium metal.

The utility model discloses a graphite sleeve for PI roll film sintering fixing, including for the sleeve in the outer or inner PI roll film cylinder and the fixed groove that is arranged in the lateral wall of cylinder and is in the axial direction of this cylinder and is penetrated, the fixed groove is used for fixing the end of PI roll film. Therefore before PI roll film sintering, by the cylinder sleeve in the outer or inner PI roll film, and by the fixed groove fixed in the lateral wall of cylinder and fixed the end of PI roll film, and then combining the graphite sleeve has intrinsic heat conduction and electric conductivity characteristics, therefore improves the conversion rate of homogeneous graphite film that PI roll film forms in the sintering process.

The application is suitable for the field of advanced manufacturing of powder materials, and provides a flash sintering equipment for large current and large pressure, which comprises a power supply module, a pressure generation module, a support frame, a high vacuum module, a jacking module, a sintering unit and a conveying module. The sintering unit is provided with a sintering platform, a floating mold module and a floating lower punch module, and is guided by upper and lower guide columns; the jacking module jacks up the lower electrode through a lead screw, pushes the floating lower punch module and the floating mold module to move upwards along the guide column to separate from the platform, and realizes floating butt joint; the pressure generation module drives the upper punch to press downwards through the upper electrode and applies pressure to the sample, and the power supply module simultaneously applies sintering current. Through the design of the floating mold module connected in a non-rigid manner, the application avoids the transmission of the pressing force to the sintering platform, prevents the equipment from overturning, and improves the stability of the sintering process; and the combination of the conveying module realizes the overall station switching of the sintering unit, and improves the continuous automatic production capacity of the equipment.