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337 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.
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
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
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
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
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
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
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
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
Green metallurgical method for recycling high-purity silicon, silver and copper from waste photovoltaic panel
PendingCN121718701APhotography auxillary processesProcess efficiency improvementElectrolysisMagnetic separation
The invention belongs to the technical field of resource recycling of waste photovoltaic panels, and discloses a green metallurgical method for recycling high-purity silicon, silver and copper from waste photovoltaic panels, which comprises the following steps: (1) disassembling the photovoltaic panels to obtain laminated components, and crushing and screening to obtain light silicon powder and metal-enriched fine powder; (2) leaching the metal-enriched fine powder by using a citric acid-hydrogen peroxide mixed solution; (3) silver ingots are recycled through precipitation and electrolysis; (4) electrolyzing to obtain electrolytic copper; and (5) performing magnetic separation, alkali washing, acid washing, spark plasma sintering and direct-current electric field solidification purification on the silicon powder to obtain the high-purity silicon ingot. A leaching system composed of citric acid and hydrogen peroxide is adopted, so that the method has the advantages of no toxic gas emission, easiness in waste liquid treatment and low cost, and unification of efficient resource recovery and environmental protection is realized.
Owner:GANSU YUANTAI NEW ENERGY TECHNOLOGY CO LTD
Preparation method of graphite-based boride ceramic modified Si-SiC ceramic coating material
The invention relates to the technical field of graphite-based ceramic coating materials, in particular to a preparation method of a graphite-based boride ceramic modified Si-SiC ceramic coating material. Metal oxide powder of TiO2, ZrO and Ta2O5, B4C and C powder are subjected to ball milling and mixing and then subjected to two times of vacuum heat treatment to obtain single-phase medium-entropy boride ceramic, then the single-phase medium-entropy boride ceramic serves as a modifier to be mixed with Si and SiC and then subjected to spark plasma sintering, and the graphite-based (Ti1 / 3Zr1 / 3Ta1 / 3) B2-Si-SiC ceramic coating material is obtained. The medium-entropy boride ceramic with excellent high-temperature oxidation resistance is prepared by adopting a boron / carbon thermal reduction method and a discharge plasma sintering method, the molecular formula of the medium-entropy boride ceramic is (Ti1 / 3Zr1 / 3Ta1 / 3) B2, the medium-entropy boride ceramic has a close-packed hexagonal structure, and when the medium-entropy boride ceramic is used for doping modification of a Si-SiC coating, the density and the high-temperature oxidation resistance of the Si-SiC coating can be remarkably improved, and the high-temperature oxidation resistance of the Si-SiC coating can be remarkably improved. Wide application prospects are realized.
Owner:ZHENGZHOU UNIV
A cemented carbide with cobalt-aluminum intermetallic compound CoAl as a bonding phase and a preparation method thereof
The present invention belongs to the technical field of cemented carbide manufacturing, and discloses a cemented carbide with a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a preparation method thereof. The cemented carbide is composed of a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a hard phase WC. When the molar ratio of the added Co element and the Al element is 1:1 or 3:2, respectively, a cemented carbide with the intermetallic compound CoAl as a bonding phase is obtained. The mixed powder is evenly mixed by ball milling, and then spark plasma sintering is performed to finally obtain a dense cemented carbide with the cobalt-aluminum intermetallic compound CoAl as a bonding phase. The material composition of the present invention is reasonably designed, the preparation process is simple and controllable, the production cost is low, and large-scale industrial production and application are possible.
Owner:NORTHEASTERN UNIV CHINA
A process for preparing a superplastic magnesium alloy
ActiveCN120648932BMaterial nanotechnologyTransportation and packagingEqual channel angular extrusionWaste material
The application discloses a preparation process of superplastic magnesium alloy, which comprises the following steps: magnesium alloy waste is treated by low-temperature ball milling to prepare nanoscale powder, the low-temperature ball milling temperature is less than or equal to 200 DEG C, the powder particle size after ball milling is less than or equal to 100 nm, and argon gas is introduced to protect the ball milling process to inhibit oxidation; the nanoscale powder is mixed with 5-8% mass ratio of Mg-Zn-Ca alloy powder, densification is carried out by adopting spark plasma sintering (SPS) at 350-400 DEG C, the sintering pressure is 20 MPa, the holding time is 10 min, and the density after sintering is greater than or equal to 98%; the sintered blank is subjected to equal channel angular pressing (ECAP) treatment, the extrusion temperature is 300 DEG C, the extrusion pass is 4 times, the mold channel included angle is 90 DEG, and the superfine-grained magnesium alloy with an average grain size of 2.1 mu m is obtained; the application realizes grain superfine of 1.5-2.1 mu m through a multi-field coupling process, activates a non-basal slip system at room temperature, the strain rate sensitivity index m is greater than or equal to 0.35, the elongation at 250 DEG C reaches 280%, and the superplastic magnesium alloy has high strength and superplastic deformation capacity.
Owner:ZHEJIANG ELECTROMECHANICAL VOCATIONAL & TECH COLLEGE
A method for preparing high-density high-uniformity IGO target material
This application relates to the field of oxide target technology, specifically disclosing a high-density, high-uniformity IGO target and its preparation method. The preparation method of the high-density, high-uniformity IGO target includes the following steps: [The text abruptly shifts to a different topic]...containing In... 3+ Ga 3+ A mixed solution of metal ions and ammonia solution is mixed to obtain a precursor precipitate, which is then allowed to stand for a preset aging time. The aged precursor precipitate is then subjected to supercritical drying and calcination to obtain IGO powder. The IGO powder is mixed with a sintering aid and then subjected to ball milling, air classification, molding, cold isostatic pressing, spark plasma sintering, and heat treatment to obtain the IGO target material. The IGO target material obtained in this application has uniform composition, high density, and stable microstructure. The transparent conductive film prepared using this target material has high visible light transmittance and excellent conductivity, solving the problems of uneven composition, low density, and poor quality of sputtered films in existing target materials.
Owner:XIANDAO THIN FILM MATERIALS GUANGDONG CO LTD
A TiC-Ti3C2T x Method for preparing MXene composite
This invention discloses a TiC-Ti3C2T x The preparation method of MXene composite material includes: acid etching of Ti3AlC2 ceramic powder, washing of etching products, centrifugation, and ultrasonic layering to obtain single-layer and few-layer Ti3C2T. x Colloidal solution, then freeze-dried to obtain monolayer and few-layer Ti3C2T x Powder; TiC powder, dried Ti3C2T x TiC-Ti3C2T was prepared by high-shear emulsification and mixing of powder and polytetrafluoroethylene dissolved in anhydrous ethanol, followed by rotary evaporation, drying, and spark plasma sintering. x MXene composite material. This invention solves the problem of reinforcement dispersion in TiC ceramic matrix and addresses the issue of Ti3C2T under high-temperature sintering conditions. x The MXene phase transformation and oxidation problems are addressed, and the TiC matrix is ​​strengthened and toughened by inducing matrix grain refinement, crack deflection, crack bridging, and lamellar pull-out, thereby improving bending strength and fracture toughness.
Owner:HOHAI UNIV
Preparation method of modified graphite / copper composite heat sink material
The invention discloses a preparation method of a modified graphite / copper composite heat sink material, and belongs to the technical field of metal-based composite materials. The method comprises the following steps: carrying out acid activation on crystalline flake graphite, modifying the crystalline flake graphite with a silane coupling agent, and selectively stripping to obtain graphite nanosheets; preparing copper-based alloy powder containing at least two carbides of Zr, Cr and Ti; performing graded ultrasonic-ball milling composite dispersion on the surface modified graphite powder, the copper-based alloy powder, the nano-diamond powder, the carboxyl functionalized multi-walled carbon nanotubes and the graphene oxide; gradient filling cold pressing forming and pre-sintering are carried out; performing hot pressing / spark plasma sintering, applying a magnetic field or a vibration field to realize graphite orientation, generating a carbide interface transition layer in situ, and reducing graphene oxide; and after machining, pulse electrodeposition is carried out on the copper-graphene composite coating, and surface micropores / micro textures and phase change material filling can be selectively formed. The method is suitable for efficient heat management of high-power electronic devices.
Owner:HEFEI SINAN METAL MATERIALS CO LTD
Sintered ceramic body having large size and method of making same
The invention relates to a sintered ceramic body having a large size and a method for manufacturing the same. The method comprises the following process steps: providing a ceramic powder (5) within an internal volume of a spark plasma sintering tool (1), wherein the tool comprises: a mold (2); upper and lower punches (4, 4 ') creating a gap (3) between the punches and the inner wall when at least one of the punches moves within the internal volume; creating a vacuum condition within the interior volume; moving at least one of the punches to apply pressure to the ceramic powder while heating, and sintering; and reducing the temperature of the sintered ceramic body.
Owner:HERAEUS CONAMIC NORTH AMERICA LLC
Wide-temperature-range self-adaptive anti-friction and anti-wear chromium-containing refractory high-entropy alloy material and preparation method thereof
The invention discloses a wide-temperature-range self-adaptive friction-reducing and wear-resistant chromium-containing refractory high-entropy alloy material and a preparation method thereof, and belongs to the technical field of wear-resistant alloy materials, and the high-entropy alloy material comprises the following raw materials in percentage by mass: Ta, Mo, Ti and Cr. The preparation method comprises the steps that Ta powder, Mo powder, Ti powder and Cr powder are weighed by mass, ball milling is conducted, then sintering is conducted through a spark plasma sintering method, and the wide-temperature-range self-adaptive anti-friction and anti-wear chromium-containing refractory high-entropy alloy material is obtained. By introducing the chromium element, the alloy can adaptively form an oxide layer with lubrication and protection effects in a wide temperature range from room temperature to ultrahigh temperature, so that the alloy shows excellent tribological performance and has extremely low friction coefficient and wear rate. The material has a wide application prospect in the fields of wear-resistant lubricating materials and high-temperature wear-resistant parts.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method for connecting titanium aluminum carbide and niobium and connecting joint
The invention provides a method for connecting titanium aluminum carbide and niobium and a connector, and relates to the technical field of welding, the method comprises the following steps: splicing a titanium aluminum carbide base material and a niobium base material together to obtain a to-be-connected assembly; under the preset air pressure, the to-be-connected assembly is heated to the preset temperature at the preset heating rate for spark plasma sintering, the to-be-connected assembly is cooled to the room temperature at the preset cooling rate, and a connector is obtained; wherein the preset heating rate is 50 DEG C / min or above, the preset temperature ranges from 1200 DEG C to 1500 DEG C, and the preset cooling rate is 50 DEG C / min or above. By the adoption of the method, cracking of the connector can be restrained, generation of brittle intermetallic compounds (Nb-Al) can be avoided, the interface bonding strength can be improved, and therefore the strength of the connector is improved.
Owner:HARBIN INST OF TECH
Graphene quantum dot reinforced copper-based composite material and preparation method thereof
The invention discloses a graphene quantum dot reinforced copper-based composite material and a preparation method thereof. The preparation method of the graphene quantum dot reinforced copper-based composite material comprises the following steps: (1) taking itaconic acid and ethidene diamine as precursors, synthesizing graphene quantum dots GQDs through a hydrothermal method, and centrifuging, dialyzing and freeze-drying to obtain GQDs powder; (2) preparing the graphene quantum dot GQDs powder into GQDs / Cu2O composite powder through a molecular-level blending method; and (3) the GQDs / Cu2O composite powder is annealed and reduced into GQDs / Cu composite powder in the Ar / H atmosphere, then vacuum ball milling and spark plasma sintering treatment are conducted, and the block GQDs / Cu composite material is prepared. The method disclosed by the invention is green, safe and low in cost, and the prepared composite material is uniform in GQDs dispersion and strong in interface bonding, has excellent conductivity and corrosion resistance, and is suitable for the fields of electronics, electrics, aerospace and the like.
Owner:JIANGSU WONEN ELECTRIC TECH
A method for preparing high-hardness Ti-Zn alloy containing fcc-Ti phase
This invention discloses a method for preparing a high-hardness Ti-Zn alloy containing the fcc-Ti phase. This method utilizes the synergistic effect of high-energy ball milling mechanical alloying and spark plasma sintering to obtain a high-hardness Ti-Zn alloy containing the fcc-Ti phase. First, high-energy ball milling mechanical alloying increases the solid solubility of Zn in Ti. Then, spark plasma sintering yields a dense pure solid solution of Ti, forming an alloy with three coexisting phases: fcc-Ti, bcc-Ti, and hcp-Ti. This significantly improves the alloy's hardness and wear resistance. The synergistic effect of high-energy ball milling mechanical alloying and spark plasma sintering is specifically designed to obtain a Ti-Zn alloy containing the fcc phase, thereby enhancing its hardness and wear resistance.
Owner:GUANGDONG OCEAN UNIVERSITY
Method for manufacturing a composite turbomachine bladed disk (BLISK) with ceramic reinforcement
A method for manufacturing a metal bladed wheel of a turbomachine reinforced by an insert made of metal matrix composite material, includes winding the ceramic fibers around a mandrel in order to form the insert, the ceramic fibers being surrounded by a material constituting the matrix; and spark plasma sintering the insert with a powder of metal constituting the bladed wheel to be manufactured.
Owner:SAFRAN SA
High-density single-phase alpha-U2N3 block material and preparation method thereof
The invention discloses a high-density single-phase alpha-U2N3 block material and a preparation method thereof. The preparation method comprises the following steps: step 1, loading a certain amount of alpha-U2N3 powder into a high-pressure sintering mold embedded with carbon paper, and pre-pressing to obtain an alpha-U2N3 pre-pressed blank; 2, the high-pressure sintering mold containing the alpha-U2N3 pre-pressed blank in the step 1 is put into sintering equipment, nitrogen is introduced, sintering pressure is applied, and after the pressure is stable, the temperature is increased to the sintering temperature and kept for a certain time; and 3, after heat preservation is finished, after the furnace body is naturally cooled to the room temperature, the high-pressure sintering mold is taken out, and a compact alpha-U2N3 block material is obtained. According to the method, alpha-U2N3 powder is used as a raw material, a high-pressure mold designed by combining materials such as graphite and silicon carbide is adopted for sintering in a discharge plasma sintering furnace or a hot-pressing sintering furnace, the sintering temperature is reduced, meanwhile, decomposition of alpha-U2N3 is inhibited, and the alpha-U2N3 block with the density close to the theoretical density is obtained.
Owner:MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS