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514 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.
P-type AgBiSe2 thermoelectric material and preparation method thereof
PendingCN119836214ASelenium/tellurium compundsEnergy inputSemiconductor materialsChemical composition
The invention provides a P-type AgBi Se2 thermoelectric material and a preparation method thereof, and relates to the technical field of thermoelectric materials. According to the P-type AgBi Se2 thermoelectric material and the preparation method thereof, the chemical composition of a compound of the P-type AgBi Se2-based thermoelectric material is AgBi (1-x) MnxSe2, 0lt, xlt; and 0.7, the compound is a P-type thermoelectric material. The AgBi Se2-based thermoelectric material with P-type conductivity in a room temperature region is prepared by doping Mn element at the position of B element in a displacement manner and combining melting with a spark plasma sintering technology, and Mn atoms replace B lattice feeding points in a solid solution doping manner to cause mass and stress field changes, so that the lattice heat conductivity is further reduced, and the room temperature Seebeck coefficient of AgB Se2 can be changed from negative to positive. The increase of the doping amount of the manganese element can cause the improvement of the carrier concentration, and the power factor is remarkably improved, so that the ZT value of the P-type thermoelectric material in the room temperature region is remarkably improved, and the room temperature thermoelectric performance of the material is further improved. The invention is used for the P-type AgBi Se2 semiconductor material and the preparation method thereof.
Owner:SHAN DONG YUAN KUN DIAN ZI KE JI GU FEN YOU XIAN GONG SI
Non-equimolar-ratio high-entropy thermoelectric ceramic and preparation method thereof
ActiveCN119528564Aevenly distributedNo agglomerationEnergy inputThermoelectric materialsPerovskite (structure)
The invention relates to a non-equimolar-ratio high-entropy thermoelectric ceramic and a preparation method thereof. The chemical formula of the non-equimolar-ratio high-entropy thermoelectric ceramic is (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 (x = 0.1-0.4). Through presintering, spark plasma sintering and reduction annealing processes, a single-phase perovskite structure composed of phases of the A-site high-entropy perovskite thermoelectric ceramic is obtained, equiaxed crystal grains are arranged in the ceramic, and the morphology of the equiaxed crystal grains is matched with that of cubic perovskite structure crystal grains. Elements Ca, Sr, Ba, La, Ti and O in the ceramic are uniformly distributed in the ceramic, and no agglomeration phenomenon exists. The A-bit non-equimolar-ratio high-entropy perovskite thermoelectric ceramic (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 obtained by the invention has low thermal conductivity, high conductivity and Seebeck coefficient, further shows a high thermoelectric ZT figure of merit, is simple to operate and short in time period, and provides an effective path for preparing high-temperature thermoelectric materials.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
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 wear-resistant nano WC hard alloy
The invention relates to the technical field of powder metallurgy, and discloses a preparation method of a wear-resistant nano WC hard alloy, which comprises the following steps: S1, WC powder, Co powder and CoCrFeNi high-entropy alloy powder prepared by a mechanical alloying method are uniformly mixed through acoustic resonance to obtain hard alloy powder; and S2, the evenly-mixed hard alloy powder is loaded into a graphite mold, two-step heating type spark plasma sintering is carried out after prepressing is carried out, and after heat preservation is finished, furnace cooling can be carried out, and the wear-resistant nano WC hard alloy can be obtained. Aiming at the contradiction between high hardness and low toughness of the metastable state nano WC hard alloy, the toughness of the material is improved by adding CoCrFeNi of a single-phase FCC structure with more slippage systems, and the phenomena of extrusion deformation, cracking and structural layering of the material are avoided; the reasonable material pore design reduces secondary abrasion of abrasive dust to the surface of the material, the abrasion of the surface of the material can be remarkably reduced by combining dispersion strengthening of superhard Cr2O3 particles generated in the material, and the purpose of remarkably improving the abrasion resistance of the material is achieved.
Owner:HENAN UNIVERSITY OF TECHNOLOGY
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
Novel carbide high-entropy ceramic and preparation method thereof
The invention provides a novel carbide high-entropy ceramic and a preparation method thereof, the novel carbide high-entropy ceramic material is prepared from TiC, VC, NbC, ZrC, TaC, HfC metal carbides and metal Ti powder as raw materials, the molar ratio of TiC: VC: NbC: ZrC: Ti is 1: 1: 1: 1: 1: x (x = 1, 2.5), and the molar ratio of TiC: VC: NbC: ZrC: TaC: HfC: Ti is 1: 1: 1: 1: 1: 1: x (x = 1, 2.5, 3.5). Preparing mixed powder before sintering by adopting a mechanical alloying method; the mixed powder is put into a mold to be pre-pressed; and sintering the pre-pressed sample by adopting a spark plasma sintering process to prepare the novel carbide high-entropy ceramic material. According to the research, a C vacancy is generated in situ in a high-entropy carbide ceramic system by adding metal Ti, so that the solid solution temperature and the sintering temperature of the high-entropy ceramic material are effectively reduced, and the toughness of the high-entropy ceramic material is obviously improved.
Owner:YANSHAN UNIV
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
Ceramic heat sink material and preparation method thereof
The invention discloses a ceramic heat sink material and a preparation method thereof, and the preparation method comprises the following steps: S1, taking a Si-Al alloy ingot, porous C-Si3N4 and a sintering aid as raw materials, and carrying out pre-sintering to obtain a compound; and S2, carrying out spark plasma sintering treatment on the compound in a vacuum atmosphere to obtain the ceramic heat sink material, according to the preparation method, the Si-Al alloy ingot and the porous C-Si3N4 are taken as raw materials, the Si-Al alloy ingot permeates into the porous C-Si3N4 material under the heating melting condition, the composite AlN-SiC ceramic material which is uniform in phase distribution and compact is formed in situ in combination with the sintering aid, the obtained ceramic heat sink material is large in crystal grain and small in number of crystal boundaries, scattering of phonons is reduced during heat conduction, and the heat sink material has the advantages of being high in heat sink efficiency and good in heat sink performance. The heat conductivity is improved; meanwhile, the prepared ceramic heat sink material is high in grain density and uniformity, low in oxygen content in crystal lattices and moderate in impurity-phase silicon content, so that the heat conductivity is high, and the ceramic heat sink material is suitable for being used as a heat sink ceramic substrate.
Owner:DONGGUAN PEPPER GRAY TECHNOLOGY CO LTD +1
Micro-nano-scale ceramic particle reinforced high-chromium cast iron-based composite material as well as preparation method and application thereof
The invention discloses a micro-nano-scale ceramic particle reinforced high-chromium cast iron-based composite material and a preparation method and application thereof.The preparation method comprises the steps that micron ZTA ceramic particles are subjected to acid pickling, sensitization treatment and activation treatment through SnCl2 and PdCl2 respectively, then the ZTA ceramic particles are chemically plated with NiMo metal coatings through a magnetic stirrer, the plating solution is alkaline, and the plating solution is subjected to acid pickling, sensitization treatment and activation treatment; uniformly mixing NiMo ZTA, V powder, high-chromium cast iron powder and alcohol on a ball mill, and injecting into a graphite mold; under the action of pressure, the composite material is prepared through a spark plasma sintering technology, and the dispersed V and carbon in a matrix are subjected to an in-situ reaction to generate nano VC ceramic particles. The micron ZTA ceramic particles provide excellent wear resistance, and meanwhile, the nano VC ceramic increases the strength and hardness of the matrix, so that the micro-nano scale ceramic particle reinforced iron-based composite material wear-resistant part is obtained.
Owner:XI AN JIAOTONG UNIV
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
Gradient multilayer nano Ti (C, N)-based metal ceramic and preparation method
PendingCN119464818AInhibited DiffusionHigh Vickers hardnessMaterial nanotechnologyTransportation and packagingHigh fractureTitanium nitride
A gradient multilayer nano Ti (C, N)-based metal ceramic and a preparation method thereof relate to the field of powder metallurgy, and the method comprises the following steps: S1, mixing 64.9% by mass of titanium carbonitride, 23% by mass of tungsten carbide, 8% by mass of cobalt, 4% by mass of molybdenum carbide and 0.1% by mass of graphene nanosheets to obtain mixed powder I; mixing 60.9% of titanium carbonitride, 23% of tungsten carbide, 8% of cobalt, 8% of molybdenum carbide and 0.1% of graphene nanosheets to obtain mixed powder II; and S2, the mixed powder I and the mixed powder II are added into a mold layer by layer, three layers of mixed powder with the surface layer being the mixed powder II layer and the core layer being the mixed powder I layer are obtained, spark plasma sintering is carried out, and the gradient multi-layer nano Ti (C, N)-based metal ceramic is obtained. According to the Ti (C, N)-based metal ceramic and the preparation method thereof, different molybdenum carbide mass proportions of the surface layer and the core layer are controlled, a hard phase enrichment area is formed on the surface layer, a binding phase enrichment area is formed on the inner core part, the Vickers hardness can be improved through hard phase enrichment, the fracture toughness can be improved through binding phase enrichment, and therefore the Ti (C, N)-based metal ceramic with the hardness and the fracture toughness is obtained.
Owner:HENAN UNIVERSITY OF TECHNOLOGY
PBO chopped fiber reinforced aluminum-based composite material and preparation method thereof
PendingCN119392123AImprove plastic deformation abilityImprove mechanical propertiesUltrasonic dispersionMechanical property
The invention provides a PBO chopped fiber reinforced aluminum matrix composite and a preparation method thereof, and belongs to the technical field of metal matrix composites.The preparation method comprises the steps that firstly, fibers are subjected to ultrasonic dispersion; 2, ball milling and powder mixing; step 3, spark plasma sintering; and 4, follow-up high-temperature annealing is conducted, the prepared PBO chopped fiber reinforced aluminum-based composite material is composed of a PBO chopped fiber reinforced body and an aluminum matrix, the composite material is high in density, the maximum tensile yield strength, the maximum tensile strength and the maximum bending strength all meet the high standard, in addition, the composite material further has the good plastic deformation capacity, and on the whole, the composite material has the good mechanical property. The composite material has outstanding comprehensive mechanical properties. In addition, the preparation process of the composite material is simple, rapid preparation of the PBO chopped fiber reinforced aluminum-based composite material can be achieved, and engineering application of the composite material can be promoted.
Owner:SHANDONG NON METALLIC MATERIAL RESEARCH INSTITUTE
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
Ag-free high-temperature active alloy brazing filler metal and preparation method and application thereof
PendingCN119549928Ahigh melting pointhigh strengthWelding/cutting media/materialsSoldering mediaSwagingFiller metal
The invention discloses Ag-free high-temperature active alloy brazing filler metal and a preparation method and application thereof. The brazing filler metal alloy comprises 9.5-12.5 wt% of Ge, 9-11 wt% of Ti, 0.1-1.5 wt% of Ni and the balance Cu, the melting point of the brazing filler metal alloy ranges from 960 DEG C to 975 DEG C, and the recommended brazing temperature ranges from 1000 DEG C to 1100 DEG C. The product forms comprise foil strips, wires and powder paste. The preparation method comprises the steps of vacuum alloying, spherical gas atomization powder preparation, centrifugal ball milling powder mixing, spark plasma sintering, homogenizing heat treatment, isothermal rolling, isothermal rotary swaging and precise drawing. The alloy brazing filler metal is suitable for ceramic high-temperature direct packaging, diamond material device high-temperature brazing, refractory metal vacuum brazing and the like, high-strength weld joints can be obtained, the service temperature is high, the cost is low, and the problem that Ag element steam pollutes devices can be effectively solved.
Owner:BEIJING INST OF NONFERROUS METALS & RARE EARTH
Multi-component transition metal carbide-silicon carbide composite material and preparation method thereof
The invention discloses a multi-component transition metal carbide and SiC combined composite material and a preparation method thereof. The sintering powder is prepared from raw materials, so that the sintering temperature is reduced, and sintering is promoted. The novel multi-component transition metal carbide and SiC combined composite material is prepared from the following raw materials: Ti powder, TiC powder, ZrC powder, HfC powder, VC powder, NbC powder, TaC powder, Mo2C powder, WC powder and SiC powder. During preparation, the raw materials are mixed in a planetary ball mill according to the proportion of different carbides; after uniformly mixing, filling a hard alloy mold with the mixture for pre-pressing; and then, carrying out spark plasma sintering (SPS) on the pre-pressed sample. And then cooling and pressure relief are conducted, and the multi-component transition metal carbide and SiC combined composite material is prepared. According to the method, sintering is promoted through vacancies in a system, the hardness and fracture toughness of the multi-component transition metal carbide and SiC combined composite material are improved, the process is simplified through the one-step powder preparation mode, and the preparation period is shortened.
Owner:YANSHAN UNIV
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