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422 results about "Spark plasma sintering" patented technology
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Spark plasma sintering (SPS), also known as field assisted sintering technique (FAST) or pulsed electric current sintering (PECS), is a sintering technique. The main characteristic of SPS is that the pulsed or unpulsed DC or AC current directly passes through the graphite die, as well as the powder compact, in case of conductive samples. Joule heating has been found to play a dominant role in the densification of powder compacts, which results in achieving near theoretical density at lower sintering temperature compared to conventional sintering techniques. The heat generation is internal, in contrast to the conventional hot pressing, where the heat is provided by external heating elements. This facilitates a very high heating or cooling rate (up to 1000 K/min), hence the sintering process generally is very fast (within a few minutes). The general speed of the process ensures it has the potential of densifying powders with nanosize or nanostructure while avoiding coarsening which accompanies standard densification routes. This has made SPS a good method for preparation of ceramics based on nanoparticles with enhanced magnetic, magnetoelectric, piezoelectric, thermoelectric, optical or biomedical properties. SPS is also used for sintering of Carbon Nanotubes for development of field electron emission electrodes. While the term "spark plasma sintering" is commonly used, the term is misleading since neither a spark nor a plasma is present in the process. It has been experimentally verified that densification is facilitated by the use of a current.
High-flux mold for spark plasma sintering and sintering equipment thereof
The utility model provides a high-flux mold for spark plasma sintering and sintering equipment thereof, and relates to the technical field of sintering, the high-flux mold comprises at least one pressure head and a porous mold; the multi-hole die comprises one or two hole opening faces, and a plurality of closed holes are formed in the hole opening faces. The closed holes are formed in the vertical direction of the porous mold, the hole diameters of the multiple closed holes are the same, and the closed holes are used for containing sintering raw materials; a plurality of sub-pressure heads are arranged on the pressure head, and the sub-pressure heads are in one-to-one correspondence with the plurality of closed holes; and the pressure head comprises a large pressure head. By adopting the high-throughput mold provided by the embodiment of the utility model, samples can be prepared on a large scale through one-time spark plasma sintering, so that the efficiency and sustainability of a spark plasma sintering process are improved, and the component screening and optimization of the samples are further accelerated.
Owner:GRINM RESOURCES & ENVIRONMENT TECH CO LTD
Preparation method of high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material
The invention discloses a preparation method of a high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material. The method comprises the following steps: 1, mechanically mixing Cu80Al20 spherical coated powder, Cu90W10 spherical coated powder, WTe2 alloy powder, Ta powder and Cu powder, and then carrying out ball milling and mixing; 2, performing SPS (spark plasma sintering); thirdly, after soaking treatment, multi-pass hot rolling deformation is carried out, and then quenching treatment is carried out; and 4, annealing heat treatment. The binary spherical coating powder, the alloy powder and the elementary substance powder are subjected to ball milling and mixing to achieve uniform distribution of all elements, high-melting-point W and Ta are added to improve the ablation-resistant temperature of the composite material, large-scale copper dendrite powder is added to form gradient distribution nanocrystals, the proportion of all the elements is controlled, the lattice distortion degree is increased, and the ablation-resistant temperature of the composite material is improved. The high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material is suitable for the fields of contacts, switches, electrical connectors, resistance welding electrodes and the like.
Owner:NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH
Forming die, forming method and application of refractory high-entropy alloy gear component
The invention discloses a forming die, a forming method and application of a refractory high-entropy alloy gear component, belongs to the technical field of near-net forming of refractory high-entropy alloy gear components, and aims to solve the technical problem that the refractory high-entropy alloy gear component is difficult to form in the prior art. The forming period of the refractory high-entropy alloy gear component is shortened, energy consumption caused by the adoption of a traditional hot forging process is reduced, the production period is shortened, the production cost is reduced, in addition, the high-temperature deformation capacity of refractory high-entropy alloy is improved through the electroplastic effect and the high-temperature softening effect, and the service life of the refractory high-entropy alloy gear component is prolonged. The limitation of ultrahigh room temperature and high-temperature strength of the refractory high-entropy alloy on forming of complex components is effectively solved, and the refractory high-entropy alloy is expected to be applied to forming of other complex components made of high-strength and difficult-to-deform materials and has wide application prospects. The manufacturing method is mainly used for manufacturing the refractory high-entropy alloy gear component.
Owner:HARBIN INST OF TECH
Preparation method of low-temperature rapid densification silicon nitride ceramic based on aluminum oxide-yttrium oxide composite sintering aid
The invention discloses a preparation method of low-temperature rapid densification silicon nitride ceramic based on an aluminum oxide-yttrium oxide composite sintering aid, and aims to solve the problems of high temperature, high energy consumption, difficult densification and the like in the existing Si3N4 ceramic preparation. The preparation method comprises the following steps: 1, mixing alpha-Si3N4 powder, Y2O3 powder and Al2O3 powder, and carrying out ball milling dispersion to obtain mixed powder; 2, carrying out rotary evaporation drying on the mixed powder under a vacuum condition; 3, carrying out heat preservation treatment under the conditions of 1600-1700 DEG C and 40-60 MPa through a spark plasma sintering process; and 4, demolding after cooling. Under the action of the Al2O3-Y2O3 composite sintering aid, phase transformation from alpha-Si3N4 to beta-Si3N4 is remarkably promoted, the relative density of the ceramic reaches 97%-99%, the fracture toughness of the ceramic is 5.21 MPa.m < 1 / 2 >, and the bending strength of the ceramic is 924.99 MPa.
Owner:HARBIN INST OF TECH
High-content ceramic / metal composite material and preparation method thereof
The invention belongs to the technical field of post-treatment of ceramic / metal composite materials, and particularly relates to a high-content ceramic / metal composite material and a preparation method thereof. In order to reduce the existence of micro gaps on the surface of the ceramic / metal composite material and improve the performance of the ceramic / metal composite material, a high-content ceramic / metal composite material blank is prepared by adopting a spark plasma sintering method, and then high-frequency pulse current is added to assist rolling; and finally, the high-content ceramic / metal composite material with micro-gap healing and improved performance is obtained.
Owner:TAIYUAN UNIVERSITY OF TECHNOLOGY
Strontium barium calcium niobate / CaAl2Si2O8 dielectric composite ceramic with high energy storage density and preparation method of strontium barium calcium niobate / CaAl2Si2O8 dielectric composite ceramic
The invention provides high-energy-storage-density strontium barium calcium niobate / CaAl2Si2O8 dielectric composite ceramic and a preparation method thereof, belongs to the technical field of composite ceramic materials, and aims to solve the technical problem of low energy storage density of composite ceramic. According to the invention, high-entropy ceramic is combined with a second phase composite technology to enhance the energy storage characteristic of strontium barium calcium niobate dielectric ceramic, Sr < 1 / 3 > Ba1 / 3 > Ca < 1 / 3 > Nb < 1-0.2 x > Zr < 0.2 x > Mg < 0.2 x > Ti < 0.2 x > Hf < 0.2 x > Ta < 0.2 x > O < 3 > nano powder is prepared by a microwave sol-gel method, and the strontium barium calcium niobate / CaAl < 2 > Si < 2 > O < 8 > dielectric composite ceramic is prepared by a spark plasma sintering method. The composite dielectric ceramic prepared by the invention has relatively high breakdown-resistant field strength, relatively high dielectric property, energy storage density and good discharge efficiency, the breakdown-resistant field strength reaches 850kV / cm, and the maximum energy storage density reaches 8.23 J / cm < 3 >.
Owner:HENAN INST OF ENG
Superfine hard alloy cutter and preparation method thereof
The invention relates to a superfine hard alloy cutter and a preparation method thereof, and belongs to the technical field of hard alloy products, and the preparation method comprises the following steps: carrying out ball milling and sieving on tungsten carbide powder, titanium carbide powder, modified cobalt powder and reinforced composite powder to obtain hard alloy powder; and the hard alloy powder is subjected to spark plasma sintering and then subjected to vacuum heat treatment, and the superfine hard alloy cutter is obtained. According to the technical scheme, a vanadium source, a yttrium source and a cobalt source are mixed through a spray conversion method to prepare modified cobalt powder; nano particles and a reinforcing material are combined through electrostatic adsorption to prepare reinforced composite powder; the modified cobalt powder and the reinforced composite powder not only can inhibit the growth of tungsten carbide grains, but also effectively improve the hardness, bending strength and fracture toughness of the hard alloy, further improve the mechanical property, thermal stability and wear resistance of the superfine hard alloy cutter, and generally improve the comprehensive performance of the superfine hard alloy cutter. And the service life is prolonged.
Owner:PENGLAI SUPERHARD COMPOSITE MATERIAL CO LTD
Modified zirconium silicate whisker reinforced aluminum oxide ceramic as well as preparation method and application thereof
The invention provides modified zirconium silicate whisker reinforced aluminum oxide ceramic as well as a preparation method and application thereof, and belongs to the technical field of new materials. The preparation method comprises the following steps: modifying the surface of alumina powder with a silane coupling agent with sulfydryl to generate zirconium silicate in situ, uniformly mixing the zirconium silicate with zirconium silicate whiskers which are treated by hydrogen peroxide and modified by phytic acid and tannic acid and a CeO2-Y2O3-MgO-SiO2 compound, and performing spark plasma sintering to obtain the modified zirconium silicate whisker reinforced alumina ceramic. The modified zirconium silicate whisker reinforced aluminum oxide ceramic prepared by the invention has better interface bonding force, excellent mechanical properties and good wear resistance, realizes ceramic densification, and has wide application prospects.
Owner:FOSHAN WANHENG NEW MATERIALS CO LTD
High-entropy carbonitride ceramic with controllable carbon-nitrogen ratio, high hardness and high elastic modulus and preparation method of high-entropy carbonitride ceramic
The invention relates to high-entropy carbonitride ceramic with controllable carbon nitrogen ratio, high hardness and high elastic modulus and a preparation method of the high-entropy carbonitride ceramic, and belongs to the technical field of high-entropy ceramics. In order to solve the problem that the existing preparation method is difficult to consider the regulation and control of the carbon nitrogen ratio and the mechanical property of the high-entropy carbonitride ceramic at the same time, the preparation method comprises the following steps: carrying out ball milling and drying on Ti powder, ZrH2 powder, Hf powder, Ta powder, Cr powder and carbon black to obtain mixed powder; performing heat treatment on the mixed powder in a nitrogen atmosphere to obtain ceramic powder; and carrying out spark plasma sintering on the ceramic powder to obtain the high-entropy carbonitride ceramic. The carbon vacancy concentration of a high-entropy system is regulated and controlled by adjusting the molar ratio of the metal powder to the carbon black, then introduction of nitrogen atoms is achieved, the carbon-nitrogen ratio of the ceramic powder is easier to regulate and control, grain growth can be effectively avoided through spark plasma sintering, the compact fine-grain high-entropy carbonitride ceramic can be obtained within a short time, and the high-entropy carbonitride ceramic has a good application prospect. The improvement of the mechanical property of the high-entropy carbonitride ceramic is facilitated.
Owner:HARBIN INST OF TECH
SPS-based yttrium tantalate ceramic ferroelastic domain width regulation and control method
The invention discloses an SPS-based yttrium tantalate ceramic ferroelastic domain width regulation and control method, and mainly solves the problems of high cost, impurity phase introduction and poor precision of an existing regulation and control method. The preparation method comprises the following steps: 1) ball-milling and mixing high-purity Y2O3 and Ta2O5 to obtain turbid liquid; 2) drying the turbid liquid, grinding and sieving, and taking powder with the particle size of 100-200 meshes; (3) the powder is loaded into a graphite mold to be subjected to spark plasma sintering, and the desired ferroelastic domain width is controlled by regulating and controlling temperature parameters of an SPS system; and 4) after the sintering temperature reaches a preset final temperature, stopping heating, and after heat preservation, cooling to room temperature to obtain the YTaO4 ceramic block with the required domain width. According to the method, the ferroelastic domain width can be controlled in a single temperature parameter regulation and control mode, impurities are prevented from being introduced, the process is simple and easy to implement, and the method can be used for optimizing the microstructure of the YTaO4 ceramic material.
Owner:XIDIAN UNIV
Pyrochlore structure high-entropy ceramic solidified body material as well as preparation method and application thereof
The invention discloses a pyrochlore structure high-entropy ceramic solidified body material as well as a preparation method and application thereof, and belongs to the technical field of nuclear waste solidification. The preparation method of the high-entropy ceramic solidified body material with the pyrochlore structure comprises the following steps: weighing raw material powder of La2O3, Nd2O3, Sm2O3, Gd2O3, Eu2O3 and ZrO2 according to the proportion in (La0. 2Nd0. 2Sm0. 2Gd0. 2Eu0. 2) 2Zr2O7; the weighed raw material powder is subjected to ball milling treatment, and ball-milled powder is obtained; under the inert gas atmosphere, the ball-milled powder is subjected to heat treatment, and heat-treated powder is obtained; and carrying out spark plasma sintering on the heat treatment powder to obtain the pyrochlore structure high-entropy ceramic solidified body material. The powder is treated by using a heat treatment technology, so that the powder is homogenized, a pyrochlore phase is formed, grain growth is more favorably inhibited, a fine grain structure is obtained, and the irradiation stability and the mechanical property of the pyrochlore material are improved.
Owner:XI AN JIAOTONG UNIV
TiC-reinforced high-entropy alloy-based wear-resistant composite material based on three-dimensional continuous structure and preparation method thereof
PendingCN120210634AMaterial nanotechnologyTransportation and packagingHigh entropy alloysWear resistance
The invention provides an AlCoCrFeNi2.1-based wear-resistant composite material based on three-dimensional continuous TiC reinforcement and a preparation method of the AlCoCrFeNi2.1-based wear-resistant composite material, and belongs to the technical field of wear-resistant composite materials. Core-shell structure powder is constructed through a physical crosslinking reaction, the surfaces of AlCoCrFeNi2.1 eutectic high-entropy alloy matrix particles are evenly coated with TiC, and the AlCoCrFeNi2.1-based wear-resistant composite material is obtained; and then a spark plasma sintering method is used for controlling TiC to be distributed in the AlCoCrFeNi2.1 eutectic high-entropy alloy in a controllable three-dimensional continuous net shape. The construction of the three-dimensional continuous structure of the AlCoCrFeNi2.1-based wear-resistant composite material improves the wide-temperature-range wear-resistant characteristic of the high-entropy alloy-based composite material, and has a wide application prospect in the field of wear-resistant materials.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
High-temperature-resistant aero-engine blade and preparation method thereof
The invention belongs to the technical field of aero-engine materials, and particularly relates to a high-temperature-resistant aero-engine blade and a preparation method thereof.According to the blade, titanium-aluminum alloy is adopted as a base body, and two novel materials including a core-shell structure self-healing reinforcement phase and a rare earth niobate ferroelastic protection compound are introduced, so that the high-temperature-resistant aero-engine blade is obtained; and the comprehensive performance of the blade in a high-temperature environment is remarkably improved. The core-shell reinforcement phase takes titanium diboride as a core and boron nitride as a shell, and can realize a self-healing function at a high temperature; the rare earth niobate compound has ferroelastic behavior and ultralow thermal conductivity through doping modification of tantalum and rhenium. The preparation process comprises the following steps: mixing the titanium-aluminum alloy powder, the reinforcing phase, the silicon carbide short fibers and the binder, carrying out spark plasma sintering molding, carrying out machining, applying the protective coating through plasma spraying, and finally carrying out heat treatment. According to the method, the process is simplified, and the prepared blade has excellent high-temperature resistance, oxidation resistance and mechanical property and is suitable for aero-engine hot end components.
Owner:CHENGDU XINRAN POWER TECHNOLOGY CO LTD
Coarse grain cemented carbide and preparation method thereof
The present disclosure relates to the technical field of powder metallurgy, especially to a coarse grain cemented carbide and a preparation method thereof. Pseudo particles in coarse grain tungsten carbide are removed by pretreating process. Broken of the coarse grain tungsten carbide in traditional wet milling is avoid by solid-liquid stirring, spay granulating and surface covering, which also guarantee the uniform distribution of PEG and cobalt salt. Transformation from cobalt salt to cobalt is safely and effectively guaranteed by performing two sintering stages with different atmosphere and temperature to obtain a WC—Co mixture material. By performing spark plasma sintering process, the precipitation of nano fine grain tungsten carbide guarantees regrowth of defect occurred in pretreating process. The coarse grain cemented carbide with the average grain size of WC above 10 μm, the uniform cobalt phase distribution and be bending strength not less than 2200 MPa is prepared.
Owner:CHONGYI ZHANGYUAN TUNGSTEN
Red mud resource reutilization method
The invention provides a red mud resource reutilization method which comprises the following steps: weighing raw materials according to the proportion of the raw materials, and grinding the raw materials into powder to obtain mixed powder; the raw materials comprise 70%-95% of matrix ceramic, 0.1%-30% of auxiliary ceramic and 0.1%-30% of red mud. Putting the mixed powder into a planetary ball mill, taking out after wet milling, and drying in a vacuum drying oven; crushing the dried powder by using a crusher, and screening by using a screen; the sieved powder is loaded into a graphite mold to be pre-pressed; and sintering the graphite mold filled with the green body in a discharge plasma sintering furnace. And cooling along with the furnace to obtain the red mud doped alumina-based composite ceramic material. According to the method for recycling the red mud, efficient utilization of the red mud is achieved, the red mud is combined with aluminum oxide and auxiliary ceramic, the red mud-doped aluminum oxide-based composite ceramic material is prepared through the processes of high-energy ball milling, spark plasma sintering and the like, and the prepared material has the advantages of being high in toughness, hardness and strength and the like.
Owner:GUANGXI UNIV
Method for preparing GeTe-based thermoelectric material by eliminating Ge enrichment through chemical reaction
The invention belongs to the technical field of preparation of high-performance thermoelectric materials, and particularly relates to a method for preparing a GeTe-based thermoelectric material by eliminating Ge enrichment through a chemical reaction. In order to further excavate the application potential of the GeTe material, the invention provides a high-performance GeTe-based thermoelectric material, the molecular formula of the high-performance GeTe-based thermoelectric material is (GeTe) 1-x (BiSbSe) x, and x is 0.03, 0.04, 0.05 or 0.06. The thermoelectric material is prepared by taking germanium particles, tellurium particles, bismuth particles, antimony particles and selenium particles as raw materials, respectively preparing GeTe and BiSbSe3 through a melting method, mixing, carrying out high-energy ball milling treatment, and carrying out spark plasma sintering to form blocks. According to the preparation method, Ge enrichment is completely eliminated through BiSbSe3 alloying reaction, so that the thermoelectric performance and the service stability of the prepared GeTe-based thermoelectric material are effectively improved.
Owner:SUN YAT SEN UNIV
High-entropy aluminum silicide ceramic as well as preparation method and application thereof
The invention discloses high-entropy aluminum silicide ceramic as well as a preparation method and application thereof. The preparation method of the high-entropy aluminum silicide ceramic comprises the following steps: 1) fully and uniformly mixing transition metal powder, aluminum powder and silicon powder to prepare mixed powder; 2) pressing the mixed powder into a green body, and then performing electric field sintering, crushing and screening to obtain high-entropy aluminum silicide powder; and 3) pressing the high-entropy aluminum silicide powder into a green body, and carrying out spark plasma sintering to obtain the high-entropy aluminum silicide ceramic. The high-entropy aluminum silicide ceramic disclosed by the invention has excellent oxidation resistance and ablation resistance under an ultra-high-temperature condition, is suitable for being used as a hot end part protection material of a hypersonic aircraft, and is simple and convenient in preparation process, simple to operate, short in reaction time and suitable for large-scale industrial production and application.
Owner:SOUTH CHINA UNIV OF TECH
Low-temperature liquid-phase sintered silicon carbide ceramic material and preparation method thereof
The invention relates to a low-temperature liquid-phase sintered silicon carbide ceramic material and a preparation method thereof, and belongs to the technical field of silicon carbide ceramics. The invention discloses a low-temperature liquid-phase sintered silicon carbide ceramic material, which is prepared from the following raw materials in percentage by mass: 80.0 to 95.0 percent of silicon carbide, 4.0 to 8.0 percent of yttrium oxide, 2.0 to 6.0 percent of aluminum oxide, 1.0 to 4.0 percent of magnesium oxide and 0.5 to 2.0 percent of lithium oxide. The invention also discloses a preparation method of the low-temperature liquid-phase sintered silicon carbide ceramic material, and the preparation method comprises the following steps: mixing the raw materials of the silicon carbide ceramic material with a solvent, ball-milling and pulping, drying, pulverizing, sieving, pre-pressing and forming, and carrying out spark plasma sintering to obtain the low-temperature liquid-phase sintered silicon carbide ceramic material. The nanoscale silicon carbide powder is used as a raw material, yttrium oxide, aluminum oxide, magnesium oxide and lithium oxide are used as sintering aids, the eutectic point and viscosity of a liquid phase are remarkably reduced, the mass transfer efficiency in the sintering process is effectively promoted, the densification efficiency is improved, and heat damage of a toughening phase is reduced.
Owner:QIANWAN INST OF CNITECH +1
Tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic material as well as preparation method and application thereof
The invention discloses a tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic material as well as a preparation method and application thereof. The preparation method of the tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic material comprises the following steps: 1) preparing a green body from metal oxide powder and boron carbide powder; 2) performing electric field sintering, crushing and screening on the green body to prepare tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic powder; and 3) pressing the tungsten-containing ultrahigh-temperature high-entropy rare earth boride ceramic powder into a green body, and then carrying out spark plasma sintering. The tungsten-containing ultra-high-temperature high-entropy rare earth boride ceramic material has excellent ultra-high-temperature oxidation resistance, is wide in component space range and low in cost, has a very wide application prospect in ultra-high-temperature thermal protection components such as the leading edge, the nose cone and the control surface of a hypersonic aircraft, and has a wide application prospect. And the preparation method has the advantages of simple operation and process flow, short reaction time, low synthesis cost and the like, and is suitable for large-scale industrial production.
Owner:SOUTH CHINA UNIV OF TECH
Low-temperature diffusion welding method for magnesium alloy and magnesium alloy connector
PendingCN120395090AWelding/soldering/cutting articlesNon-electric welding apparatusMetal coatingMetallic materials
The invention relates to the technical field of metal material connection, in particular to a magnesium alloy low-temperature diffusion welding method and a magnesium alloy connector, and the magnesium alloy low-temperature diffusion welding method comprises the steps that metal powder is adopted to conduct cold spraying on the surfaces of two magnesium alloys to be welded, a metal coating is formed on the surface of each magnesium alloy to be welded, and the metal powder comprises at least one of copper powder, nickel powder, titanium powder and silver powder; carrying out surface self-nanocrystallization treatment on the metal coating of each magnesium alloy to be welded; and diffusion welding is conducted on the two to-be-welded magnesium alloys subjected to surface self-nanocrystallization treatment through the spark plasma sintering technology. The method aims at solving the problem that the welding effect of the magnesium alloy is affected due to the existence of an oxidation film.
Owner:HARBIN INST OF TECH
High-thermal-conductivity copper-based composite material for heat dissipation and preparation method thereof
PendingCN121023288ASemiconductor/solid-state device detailsSolid-state devicesThermal dilatationInterfacial thermal resistance
The invention discloses a high-thermal-conductivity copper-based composite material for heat dissipation and a preparation method thereof, and relates to the technical field of composites.The preparation method comprises the steps that graphene-tungsten graded coated diamond reinforced powder and spherical copper powder are mechanically mixed in a planetary ball mill, and uniform composite powder is obtained; and the uniform composite powder is loaded into a mold, curing forming is conducted in a vacuum environment through a spark plasma sintering technology, a diamond-tungsten carbide-tungsten-copper gradient interface structure is generated in situ in the sintering process, and the high-heat-conductivity copper-based composite material for heat dissipation is obtained. According to the invention, high thermal conductivity and low thermal expansion are realized by constructing a gradient interface, the thermal cycle reliability is improved by introducing a flexible layer, and the composite material with highly consistent performance is prepared by combining self-adaptive process regulation and control, so that the technical problems of high interface thermal resistance and unstable performance are solved.
Owner:SUZHOU SICUI THERMAL CONTROL MATERIAL TECH CO LTD
Rapidly sintered rhenium plate and preparation method thereof
The invention discloses a rapidly sintered rhenium plate and a preparation method thereof, and relates to the field of powder metallurgy. The preparation method comprises the following steps: putting a mold filled with rhenium powder into spark plasma sintering equipment, vacuumizing, introducing hydrogen-containing mixed gas, carrying out a gradient pressurization-pulse sintering process, heating the rhenium powder to a target temperature at a rate of 80-200 DEG C / min, carrying out heat preservation, synchronously applying axial pressure, controlling the pressure to be 8-12 Mpa when the temperature is less than 1000 DEG C, controlling the pressure to be greater than or equal to 15 Mpa when the temperature is greater than or equal to 1000 DEG C, and carrying out sintering for 2-3 hours; and cooling, demolding, reducing and annealing in a hydrogen atmosphere, and grinding to obtain the rhenium plate. Rapid sintering densification of pure rhenium is achieved through the spark plasma sintering technology, the temperature rising time is greatly shortened, step pressure rising is carried out before the nucleation stage of heating sintering, it is avoided that moving filling of rhenium powder is hindered by high pressure at the low temperature, size homogenization is promoted, and the prepared rhenium plate is good in uniformity and high in density and purity; and the oxygen content is low.
Owner:JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
Preparation method of graphene copper composite wire
The invention provides a preparation method of a high-strength and high-conductivity graphene-copper composite wire, which comprises the following steps of: (1) placing graphene-copper composite powder in a graphite mold, and preparing a graphene-copper composite block through vacuum hot pressing sintering or spark plasma sintering; (2) the graphene copper composite block obtained in the step (1) is subjected to hot extrusion treatment, and a graphene copper composite bar is prepared; and (3) the graphene copper composite bar obtained in the step (2) is subjected to cold drawing treatment, and the graphene copper composite wire is prepared.
Owner:BEIJING TANYUAN NEW MATERIAL TECH CO LTD
Graphene / aluminum alloy composite material with high conductivity and preparation method thereof
PendingCN121406946ATransportation and packagingMetal-working apparatusInterfacial reactionPolyvinyl alcohol
The invention discloses a graphene / aluminum alloy composite material with high conductivity and a preparation method thereof, and belongs to the technical field of metal-based composite materials. And the electric conductivity is not lower than 70% IACS. The preparation method comprises the following steps: carrying out surface copper plating pretreatment on aluminum alloy powder; performing ultrasonic dispersion on graphene by using a polyvinyl alcohol solution to obtain a stable dispersion liquid; mixing, stirring, drying and filtering the copper-plated powder and the graphene dispersion liquid to obtain graphene-coated composite powder; and finally, carrying out rapid densification sintering by adopting a spark plasma sintering technology. The core innovation point of the preparation method is that the problem of dispersion and interface combination of graphene in an aluminum matrix is solved synergistically through combination of a copper plating transition layer and PVA auxiliary dispersion-adsorption coating, then interface reaction is avoided through SPS rapid sintering, finally, the composite material with excellent conductivity is obtained, and the technical index reaches the domestic leading level.
Owner:DALIAN DELI GRAPHENE MATERIAL CO LTD
Method for preparing diamond grinding wheel through binding agent doped with rare earth material
PendingCN120620102AAbrasion apparatusLiquid/solution decomposition chemical coatingReaction layerBond interface
The invention discloses a method for preparing a diamond grinding wheel through a binding agent doped with a rare earth material, and particularly relates to the technical field of diamond grinding wheels, and the method comprises the steps of S1, diamond abrasive particle pretreatment, S2, composite binding agent preparation, S3, gradient charging and S4, spark plasma sintering. According to the method, abrasive particle concentration and density gradient distribution is formed on a grinding wheel working layer through a gradient charging process, and a reinforced reaction layer is formed on a diamond-binding agent interface in combination with a rare earth additive, so that remarkable improvement of the grinding efficiency, great reduction of the abrasive particle falling-off rate and optimization of comprehensive mechanical properties are synergistically realized; and meanwhile, the impact resistance and the heat dissipation capacity are enhanced through the edge strengthening area and the multi-stage pore structure, and the application scene in the high-hardness material machining field is effectively expanded.
Owner:LINYING DECAT NEW MATERIAL CO LTD
High-toughness and high-compactness titanium carbonitride-based metal ceramic material and preparation method thereof
The invention discloses a titanium carbonitride-based metal ceramic material with high toughness and high compactness, titanium carbonitride is used as a hard matrix phase, tungsten carbide is used as an additive, FeCoCrNi is used as a binding phase, the mass ratio of entropy alloy in FeCoCrNi in the metal ceramic material is 12%-30%, and the mass ratio of tungsten carbide in the metal ceramic material is 20%. The invention also provides a preparation method of the titanium carbonitride-based metal ceramic material, which comprises the following steps: carrying out primary ball-milling mixing on iron, cobalt, nickel and chromium powder to obtain medium-entropy alloy binding phase powder, carrying out secondary ball-milling mixing on titanium carbonitride, the uniformly dried medium-entropy alloy binding phase powder and tungsten carbide powder, filling into a graphite mold after mixing, and carrying out compression molding to obtain the titanium carbonitride-based metal ceramic material. And carrying out spark plasma sintering on the titanium carbonitride-based metal ceramic material to prepare the titanium carbonitride-based metal ceramic material. According to the titanium carbonitride-based metal ceramic material and the preparation method thereof, the excellent mechanical property and the good molten aluminum corrosion resistance are achieved at the same time.
Owner:XIANGTAN UNIV
A high-entropy carbonitride ceramic with controllable carbon-nitrogen ratio, high hardness and high elastic modulus and a preparation method thereof
The present application relates to a kind of high-entropy carbonitride ceramics with controllable carbon-nitrogen ratio, high hardness and high elastic modulus and a preparation method thereof, and belongs to the technical field of high-entropy ceramics.To solve the problem that existing preparation methods cannot simultaneously control carbon-nitrogen ratio and mechanical properties of high-entropy carbonitride ceramics, the present application obtains a mixed powder by ball milling and drying Ti powder, ZrH2 powder, Hf powder, Ta powder, Cr powder and carbon black;obtains ceramic powder by heat treatment of the mixed powder in a nitrogen atmosphere;and obtains high-entropy carbonitride ceramics by spark plasma sintering of the ceramic powder.By adjusting the molar ratio of metal powder to carbon black, the present application controls the carbon vacancy concentration of high-entropy system, and then realizes the introduction of nitrogen atoms, which makes it easier to control the carbon-nitrogen ratio of ceramic powder.Spark plasma sintering can effectively avoid grain growth, and obtain dense fine-grained high-entropy carbonitride ceramics in a relatively short time, which is conducive to the improvement of mechanical properties of high-entropy carbonitride ceramics.
Owner:HARBIN INST OF TECH
Multi-stage aging strengthening Ti-Nb-C heterostructure composite material and preparation method thereof
The invention discloses a multi-stage aging strengthening Ti-Nb-C heterostructure composite material and a preparation method thereof.The preparation method comprises the steps that firstly, ball milling mixing is conducted on Nb powder, graphene and Ti powder in sequence through a two-step powder mixing method, according to the mass percent, the Nb powder accounts for 28%-32%, the graphene accounts for 0.03%-0.04%, and the Ti powder accounts for the balance; then composite powder obtained through mixing is sequentially subjected to spark plasma sintering, hot rolling, linear cutting, solid solution quenching and multi-stage aging treatment, and finally the Ti-Nb-C composite material is obtained through natural cooling to the room temperature. By introducing solid solution quenching and multi-stage aging, uniform dispersion and precipitation of carbides in a diffusion zone are promoted, and collaborative optimization of the material in the aspects of strength and plasticity is achieved.
Owner:HUNAN UNIV
Alumina-zirconia eutectic sintering material and preparation method thereof
The invention relates to an alumina-zirconia eutectic sintering material and a preparation method thereof, and relates to the technical field of high-temperature structural ceramic materials. The preparation method comprises the following steps: dispersing 80-95 parts of aluminum oxide powder, 1-10 parts of zirconium oxide powder and 0.1-1 part of yttrium oxide powder in a solvent, and carrying out wet grinding and drying to obtain mixed powder; and adding 1-3 parts of a binder into the mixed powder, uniformly grinding, drying, carrying out compression molding, and carrying out SPS (spark plasma sintering) treatment to obtain the alumina-zirconia eutectic sintering material. The alumina-zirconia eutectic sintering material is obtained through raw material powder wet grinding, compact preparation and spark plasma sintering. The eutectic sintering material has the characteristics of high strength, high fracture toughness, good creep resistance and the like; the method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.
Owner:ANHUI JINHETAI NEW MATERIALS CO LTD
Oil reservoir with gradient pore structure and preparation method thereof
The invention provides an oil reservoir with a gradient pore structure and a preparation method thereof, and the preparation method comprises the following steps: firstly, fully mixing raw materials required by each layer according to designed gradient components, gradient layer number and component content in each layer to obtain the raw materials required by each layer; all the raw materials comprise 70-100% by weight of polyimide, and the particle size gradient of the polyimide in the raw materials used from the middle part to the upper and lower end parts is reduced; performing cold isostatic pressing on the raw materials required by each layer to obtain a blank; the blanks are stacked and then subjected to cold isostatic pressing, and prefabricated blanks are obtained; the prefabricated blank is placed in a mold to be subjected to spark plasma sintering, and a sintered blank is obtained; and finally, processing the sintered blank to obtain the oil reservoir. The porosity of the middle of the oil storage device is large, the porosity of the two ends of the oil storage device is small, on the premise that the lubricating oil amount is guaranteed, the problem that a large amount of oil flows out in the high-temperature section or during high-low temperature alternating, and consequently current is unstable can be effectively solved, oil flows out of the oil storage device slowly in the state, and an oil supply system achieves long-time accurate oil supply.
Owner:LUOYANG BEARING RES INST CO LTD +1