237 results about "Refractory metals" patented technology

The invention discloses a multi-component composite oxide dispersion strengthening molybdenum alloy and a preparation method thereof, and relates to the technical field of refractory metal powder metallurgy preparation. The molybdenum alloy comprises a molybdenum matrix and a Y-X-O composite oxide nano precipitated phase dispersed and distributed in the molybdenum matrix. The molybdenum alloy comprises the following components in percentage by mass: 1%-2% of Y2O3, 0.3%-1.2% of an active element X, 96.5%-98.7% of molybdenum and inevitable impurities, wherein X is selected from one of Ti, Zr and Hf; the Y-X-O composite oxide nano precipitated phase and the molybdenum matrix form a coherent or semi-coherent interface, and the interface mismatch degree is less than or equal to 5%. The molybdenum alloy has excellent high-temperature strength and creep resistance, and can be applied to the high-temperature fields of nuclear industry, aerospace and the like.

The invention discloses a preparation method of niobium-tungsten alloy spherical powder and a 3D printing method of the niobium-tungsten alloy spherical powder, and belongs to the technical field of refractory metal material preparation.The preparation method comprises the steps that niobium, tungsten, molybdenum and zirconium refractory metal raw materials are smelted to obtain cast ingots with uniform components, and hydride powder is formed after hydrotreating and mechanical crushing; spherical powder is prepared by adopting a plasma spheroidizing technology, then dehydrogenation is performed for 1-3 hours at the temperature of 450-750 DEG C, magnesium powder is added, treatment is performed for 2-5 hours in an inert atmosphere at the temperature of 800-1100 DEG C, and finally the low-oxygen niobium-tungsten alloy spherical powder with the oxygen content lower than 120 ppm is obtained. Compared with a traditional process, the spheroidizing treatment is innovatively carried out before the dehydrogenation and oxygen reduction process, the deoxidation efficiency is improved through the relatively small specific surface area of spherical powder, and oxygen content control is achieved in combination with magnesium powder heat treatment. The problems of high oxygen content and low powder yield in a traditional process are solved, and material support is provided for high-performance niobium-tungsten alloy components in the fields of aerospace, nuclear power and the like.

Disclosed are exemplary methods for rheologically controlling a metal amalgam by including non-refractory filler particles (e.g., non-refractory metal filler particles, etc.) for processing and reliability enhancement as a thermal interface material. An exemplary method may comprise rheologically controlling a metal amalgam including filler particles (e.g., non-refractory metal filler particles, etc.) for use as a thermal interface material without sacrificing thermal conductivity and while maintaining rheology and spread control (e.g., limiting or preventing material migration, etc.) when pressed between two substrates. An exemplary method may comprise using non-refractory (not corrosive resistant) filler particles (e.g., non-refractory metal filler particles, etc.) to achieve a stable homogenous metal amalgam suspension with viscosity control based on total filler particle loading without sacrificing thermal performance for thermal interface material applications. The rheology controlled metal amalgam may be used as a thermal interface material between a heat source and another component of an electronic device.

The invention discloses a preparation method of a refractory metal reinforced copper-based composite material EBSD sample. The method comprises the following steps: 1, carrying out linear cutting to obtain a to-be-treated original sample; 2, performing thermal inlaying on the sample; 3, mechanical grinding; 4, vibration polishing; 5, chemically and mechanically polishing; and sixthly, cleaning and blow-drying are conducted, and the refractory metal reinforced copper-based composite EBSD sample is obtained. Scratches and defects of the sample are removed through vibration polishing, and synergistic regulation and control of the corrosion rate are achieved and tiny corrosion pit defects on the surface of the sample are eliminated by means of the oxidation effect, the complexing effect and the corrosion inhibition effect of the chemical mechanical polishing solution on the two phases of the heterogeneous refractory metal reinforced copper-based composite material. The sample surface is kept in a flat, smooth and low-stress state, the sample surface quality is remarkably improved, the analysis rate of the obtained EBSD sample is high, and the method has the advantages of being practical, efficient and low in cost.

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

The invention relates to the technical field of metal surface coating preparation, in particular to a high-temperature thermal cycle impact resistant yttrium oxide composite coating on the surface of refractory metal and a preparation method of the yttrium oxide composite coating. The refractory metal composite coating material is composed of a refractory metal matrix and a coating. The coating comprises a bonding layer, a middle layer and a surface layer which are arranged in a contact manner; the bonding layer is composed of the refractory metal and yttrium oxide, and the porosity of the bonding layer is 1%-5%; the middle layer is a pure yttrium oxide layer with the porosity of 5%-10%; the porosity of the surface layer is 1t; 2% of a pure yttrium oxide layer; the melting point of the refractory metal is 2470 DEG C or higher. According to the refractory metal composite coating material and the preparation method and application thereof, the refractory metal coating structure is optimized, the porosity of the coating is further adjusted, the high-temperature molten metal corrosion resistance and the high-temperature thermal shock resistance of the coating are improved, meanwhile, the bonding strength between the coatings is guaranteed, and the service life of the coating is prolonged. The method is expected to be applied to high-melting-point metal smelting equipment.

The invention discloses a reversible metal 4D printing method based on hydrogel reversible deformation and a metal part, and belongs to the field of metal additive manufacturing. The method comprises the following steps: firstly, constructing a three-dimensional model comprising a hydrogel driving layer and a metal blank layer; respectively preparing hydrogel light-cured ink and metal or precursor slurry thereof; printing the two layers of materials sequentially or alternately by adopting a photocuring printer to obtain a composite green body; the hydrogel layer is dehydrated and shrunk through drying, the component is driven to generate preset shape deformation, the hydrogel layer absorbs water and expands through soaking, and reversible recovery of the shape of the component is achieved; and degreasing, selective reduction and sintering heat treatment are conducted on the component, and the compact final metal component is obtained. According to the invention, the independent hydrogel layer is used as a deformation driver, the dependence on the intrinsic phase change characteristic of a metal material is avoided, the material universality is extremely high, the method can be widely applied to 4D printing of various materials including refractory metal and high-reflection metal, and reversible control of shape change is realized.

The invention relates to an automatic filling rubber sheath preforming method and device for rare refractory metal powder. The device comprises a vacuum feeding mechanism, a weighing and metering mechanism, a vibration filling mechanism, an automatic plugging mechanism, a sheath transposition mechanism, a manipulator loading and unloading mechanism and a control system. According to the system, efficient, uniform and sealed filling of tantalum powder is achieved through vacuum material suction, weighing control, filling and compaction at the same time, automatic plugging and sealing and bag sleeve replacement through linkage of a mechanical arm. The control system coordinates sequential operation of all links on the basis of signals of multiple sensors, the powder amount range of a single bag is 6-17 kg, and the control system is matched with rubber bags of multiple specifications such as phi 60 * 1000 mm and the like. According to the method, the powder loading density consistency, the sealing reliability and the production line rhythm are improved, the labor intensity and the dust pollution are remarkably reduced, and the method is suitable for the field of metallurgy preforming of tantalum, alloy powder of tantalum and other metals.

The invention provides an automatic profiling tungsten-copper alloy and a preparation method thereof, and belongs to the technical field of refractory metal powder metallurgy. After a spherical tungsten powder compact is degummed and sintered, vacuum pretreatment is adopted, copper infiltration is conducted for 5-15 min in the argon environment with the temperature of 1100-1200 DEG C and the pressure of 0.5-2 MPa, the driving force and the inert protection effect of high-pressure argon on molten copper liquid are fully utilized, rapid, uniform and thorough infiltration of the copper liquid in pores of a tungsten framework is achieved, and the compactness and the structure uniformity of the tungsten-copper alloy are improved. Meanwhile, oxidation of tungsten and copper at high temperature and volatilization loss of copper liquid can be avoided through the synergistic effect of vacuum and argon, and the adverse effect of impurities on performance is reduced. And the rapid copper infiltration in the high-pressure environment can shorten the production period and improve the process efficiency, and is suitable for industrial batch production. And the problems of insufficient infiltration, oxidation pollution, component segregation and the like easily occurring in the traditional copper infiltration process are effectively solved.

A method of preparing a metal matrix composite powder for additive manufacturing, by mixing a metal powder with a ceramic powder, binding the mixed powders together to form an electrode; and using the electrode in an electrode induction gas atomisation (EIGA) process to prepare the metal matrix composite powder. The ceramic can be TiB2, SiC, AlN or a MAX-phase ceramic, the latter having the formula Mn+1AXn where M is a metal, A is an A-group element and X is C, N and / or B, e.g. Ti3SiC2, Al4SiC4 or Al8SiC7. The metal powder can be steel (e.g. stainless steel), titanium, aluminium, cobalt, magnesium, copper, refractory metals, PGMs vanadium and alloys thereof (e.g. 6061 aluminium). Binding to form the electrode can be by cold isostatic pressing, sintering and / or the application of pressure. The powder can be processed by laser powder bed fusion AM or direct energy deposition printing.

The invention relates to the technical field of large steel casting manufacturing, and discloses a crusher rack set for mining machinery and a casting method of the crusher rack set. The rack set comprises a cast steel body and a functional gradient reaction framework which is arranged in the cast steel body in advance and forms metallurgical bonding. The framework is made of refractory metal alloy, and an A area and a B area are divided on the framework. The area A is arranged at the heat accumulation core of the casting and is provided with a strong reaction coating on the surface; the area B extends outwards from the area A, and the surface of the area B is provided with a high-thermal-conductivity ceramic coating. The method comprises the steps of preparing the framework, installing the framework in a casting mold cavity, and then carrying out molten steel pouring and heat treatment. In-situ forced nucleation is initiated at the core of the casting through the strong reaction coating of the area A, a heat conduction path from inside to outside is established by means of the high heat conduction coating of the area B, and sequential solidification of the casting is achieved, so that defects such as shrinkage porosity and shrinkage cavities are effectively transferred, the density and uniformity of the internal structure of the casting are improved, and the casting quality is improved. And the overall mechanical property of the rack set is improved.

The invention discloses a high-efficiency catalyst and a preparation and application method thereof, and relates to the technical field of nano carbon material preparation, the high-efficiency catalyst comprises the following components: an organic metal compound containing iron, cobalt and nickel, a refractory metal organic compound, a cocatalyst and a functional auxiliary agent, the catalyst is used for preparing the carbon nanotube by a floating chemical vapor deposition method, a high-temperature plasma CVD method or a plasma arc method, all components of the catalyst are uniformly mixed through melting granulation, the defect that the proportion is difficult to accurately control due to independent feeding is avoided, meanwhile, powder feeding can be cracked and evaporated in the subsequent carbon nanotube preparation process, and the carbon nanotube preparation efficiency is improved. The catalyst with higher concentration is obtained, and the preparation efficiency of the single-walled carbon nanotube is remarkably improved.

According to the Ta-based refractory alloy reinforced by the silicide phase eutectic structure and the preparation method of the Ta-based refractory alloy reinforced by the silicide phase eutectic structure, nanoscale HfSi2 powder is introduced, and the alloy reinforced by the silicide phase eutectic structure is formed in the Ta-based alloy. According to the alloy, particles or powder of refractory metal elements such as Ta serves as a matrix raw material, nanoscale HfSi2 powder is introduced into the matrix raw material, an alloy ingot is prepared through a smelting process, and the alloy material is subjected to sufficient deformation recovery and homogenization through multiple times of pressure processing and high-temperature vacuum annealing treatment. A multi-level spherical eutectic structure exists in the alloy prepared through the method, the silicide phase serves as a strengthening phase, dislocation movement can be effectively inhibited, and the room-temperature mechanical property of the alloy is remarkably enhanced. The room temperature tensile elongation is about 30%, the yield strength is about 600 MPa, the tensile strength is about 700 MPa, and compared with a traditional Ta-based alloy, the tensile strength is obviously improved. The alloy of the system can be widely applied to structural parts by means of plastic deformation processing, heat treatment and the like.

The invention discloses a copper metal complex and a preparation method thereof. The copper metal complex is prepared by mixing copper powder and refractory metal powder, adding a dispersing agent and graphite and carrying out compression and vacuum sintering. The outer layer of the complex structure is copper foil, the inner layer is uniform alloy powder, the complex structure can be used as intermediate alloy for subsequent smelting, the smelting temperature is remarkably reduced, element oxidation is inhibited, and the component uniformity is improved; the method is suitable for preparing the copper-based complexes of various high-melting-point and easily-oxidized elements.

The invention relates to the technical field of alloy preparation, particularly provides a 650 DEG C high temperature resistant titanium-based composite material plate, and further provides a preparation method of the plate. The titanium-based composite material plate resistant to the high temperature of 650 DEG C, provided by the invention, is prepared from the following chemical components in percentage by mass: 6.0 percent to 7.0 percent of Al, 1.0 percent to 3.0 percent of Zr, 0.5 percent to 2.0 percent of Mo, 0.4 percent to 1.0 percent of Nb, 0.4 percent to 1.0 percent of W, 0.1 percent to 0.4 percent of Si, 0.4 percent to 0.7 percent of B, 0.01 percent to 0.10 percent of C and the balance of Ti and inevitable impurities. According to the titanium-based composite material component system provided by the invention, a vanadium element which is easy to generate interface reaction at high temperature is abandoned, and refractory metal elements such as niobium and tungsten are adopted to cooperate with a ceramic reinforced phase formed by boron, carbon and the like, so that the high-temperature performance and the thermal stability of the material are improved; meanwhile, by controlling the content of molybdenum, aluminum and other elements within a specific interval, the hot working performance of the material is remarkably improved while high strength is maintained, and the contradiction between insufficient high-temperature performance and poor hot working performance of a traditional titanium-based composite material is effectively solved.

The application discloses a method for preparing high-purity superfine tungsten powder by series impurity removal and microwave calcination, and relates to the technical field of refractory metal powder metallurgy. The method uses 99% and below industrial-grade ammonium paratungstate as raw material, and sequentially performs pyrolysis, two-stage physical purification, ultrasonic synergic acidolysis deep purification, microwave uniform calcination and sectional reduction. Firstly, the ammonia solution-evaporation crystallization method and the chemical precipitation method are connected in series to realize deep impurity removal, and the chemical precipitation method is used to directly obtain a nano tungsten oxide precursor, so that the morphology of the tungsten powder is guaranteed for subsequent reduction; secondly, the microwave calcination process is introduced to realize fast and green and environment-friendly uniform heating, and the hard agglomeration of the precursor is significantly reduced; finally, the sectional reduction method is adopted to effectively block the CVT effect in the reduction process, and abnormal grain growth is avoided. The method solves the problems of incomplete purification, sintering agglomeration of the precursor during reduction and out-of-control reduction particle size in the prior art, and the prepared tungsten powder has high purity and small average particle size.

The present invention proposes a powder standard sample comprising at least one of titanium carbonitride, titanium carbide, and titanium nitride; wherein the nitrogen content is 3% to 22%, the oxygen content is less than 1.0%, the hydrogen content is less than 0.05%, and the total impurity elements are less than 0.2%. When the powder standard sample is used for testing, the data is fitted into a working curve using a linear regression method with a linear coefficient of 0.9998, indicating good linearity. The resulting working curve meets the high nitrogen analysis range of refractory metals such as tungsten, titanium, tantalum, and niobium, as well as ceramic alloy samples, and provides stable, accurate, and reliable test results.

The application relates to the technical field of refractory metal material processing, in particular to a vacuum smelting system and method for high-purity molybdenum and a fiber-structure molybdenum material, the vacuum smelting system for high-purity molybdenum comprises a three-layer composite crucible, the vacuum smelting method for high-purity molybdenum comprises the following steps: step S1): under the condition of a vacuum degree of less than or equal to 5*10 ‑3 Pa, a three-layer composite crucible is used to perform consumable smelting on molybdenum raw materials; step S2): a directional solidification rate is controlled to be 8-12 mm / min, and a longitudinal temperature gradient is formed to be greater than or equal to 100 DEG C / cm; step S3): multi-stage plastic deformation is implemented on a solidified ingot, and a total deformation amount is greater than or equal to 90%; the fiber-structure molybdenum material is formed with a longitudinal continuous fiber structure in the material, a grain length-diameter ratio is greater than or equal to 10:1, a fiber diameter is less than or equal to 5 microns, hydrogen content is less than or equal to 5 ppm, oxygen content is less than or equal to 50 ppm, and a room-temperature tensile strength is greater than or equal to 780 MPa; the application can prepare high-purity fiber-structure molybdenum material, and improves the problem of insufficient axial performance caused by the isotropy of a traditional equiaxed crystal structure.

The invention discloses a preparation method of high-purity refractory metal spherical powder, which comprises the following steps: preparing high-purity refractory metal of which the initial shape is a block, cleaning and drying the refractory metal, smelting the refractory metal into alloy metal liquid, carrying out vacuum suction casting on the molten metal liquid, pouring a material into cooling water after suction casting is completed, and carrying out ingot casting and cooling, so as to obtain the high-purity refractory metal spherical powder. After the cast ingot is cooled, a metal bar is obtained, and finally the metal bar forms refractory alloy powder; the prepared powder is sprayed out through smelting atomization equipment, refractory alloy powder is put into a radio frequency induction plasma device, technological parameters are adjusted, and spherical powder is obtained; oxidation and impurity introduction of powder in the machining process can be effectively reduced through the radio frequency induction plasma device; when the refractory metal spherical powder is prepared, melting or spheroidizing can be achieved only when the metal powder reaches the specific temperature, the metal material can be rapidly and evenly heated through the high-frequency magnetic field effect of radio frequency induction heating, and temperature fluctuation is reduced.

The application provides a preparation method of a molybdenum-copper composite material part blank, and relates to the technical field of refractory metal preparation and processing. Molybdenum powder and copper particles are alternately and layer by layer laid flat, and then cold isostatic pressing is performed to obtain a powder blank; the thickness of each molybdenum powder layer and each copper particle layer is independently less than or equal to 20 mm; the powder blank is subjected to reduction pre-sintering in a hydrogen atmosphere to obtain a pre-sintered blank; the pre-sintered blank is subjected to internal melting and infiltration sintering in a hydrogen atmosphere to obtain a sintered blank; and the sintered blank is subjected to hot isostatic pressing to obtain a molybdenum-copper composite material part blank. Through the above method, a molybdenum-copper composite material part blank with uniform distribution of molybdenum and copper phases and high density and large size can be obtained.

The present invention relates to a set of foundry cores (1) comprising at least one refractory metal core (4), at least one ceramic core (2) and at least one fastening element (6) placed on the ceramic core (2) and / or on the refractory metal core (4), wherein the cores (2, 4) and the at least one fastening element (6) are rigidly connected to each other, wherein the set of cores (1) has a protective coating (10) covering at least part of the refractory metal core (4) and the at least one fastening element (6), and wherein the protective coating (10) comprises at least a first protective layer.

The present invention belongs to the technical field of refractory metal alloy preparation, and specifically relates to a method for preparing medium-entropy micro-nano alloys using refractory metals. The invention adopts a laser irradiation method, using a refractory first metal, a second metal that is mutually soluble in the refractory first metal, and a third metal that is immiscible with the refractory first metal but mutually soluble in the second metal as raw materials. The refractory first metal and the second metal are first subjected to non-focused laser irradiation in a liquid phase to form alloy nanoparticles. The alloy nanoparticles and the third metal are then subjected to non-focused laser irradiation in a liquid phase to obtain a medium-entropy micro-nano alloy. The medium-entropy micro-nano alloy obtained by the method of the present invention is dense and has a uniform distribution of components, and overcomes the technical defects of the existing preparation methods that introduce impurities such as surfactants.

The invention discloses a preparation method of a high-temperature anti-oxidation metal-based oxide ceramic coating on a refractory metal surface, which comprises the following steps: ultrasonically dispersing high-melting-point nanoparticles in a micro-arc oxidation electrolyte, regulating and controlling the electric field energy density of micro-arc discharge, and growing a metal-based oxide ceramic coating structure on the refractory metal surface in situ, thereby obtaining the high-temperature anti-oxidation metal-based oxide ceramic coating on the refractory metal surface. The high-temperature anti-oxidation protection is improved; the invention further discloses the refractory metal surface high-temperature anti-oxidation metal-based oxide ceramic coating. According to the preparation method, the high-melting-point nano particles are introduced into the micro-arc oxidation electrolyte, ultrasonic dispersion is carried out, and the electric field energy density of micro-arc discharge is regulated, so that a densified ceramic coating structure with the porosity being less than or equal to 10% and the interface bonding strength being greater than or equal to 25 MPa is prepared, and the high-temperature oxidation resistance of the coating is enhanced; the compactness and bonding strength of the coating structure are improved through high-melting-point nanoparticle compounding and discharge parameter cooperative regulation and control, and the method is suitable for the technical field of refractory alloy surface strengthening treatment.

The invention discloses a high-strength ceramic metallization method and application thereof. The method comprises the following steps that metallized powder is provided, and the metallized powder is obtained by mixing and ball-milling the following powdery components including, by mass, 70%-75% of refractory metal, 6%-12% of Al2O3, 1%-5% of Mn, 6%-22% of SiO2 and 1%-7% of CaO; uniformly mixing the metallized powder with a binder to obtain metallized slurry; and printing the metalized slurry on the surface of an aluminum oxide ceramic substrate, drying, and sintering in a hydrogen furnace to form a metal layer with the thickness of 15-50 microns on the surface of the substrate. According to the technical scheme, the problems that an aluminum oxide ceramic energy transmission window is prone to sparking, breakdown and the like and the problems that a high-purity fine-grain aluminum oxide ceramic metalized layer is low in sealing strength, poor in compactness and the like are solved, and the obtained metalized aluminum oxide ceramic can be well applied to preparation of a high-power energy transmission window.

The application discloses a refractory metal-ceramic composite environmental barrier coating adhesive layer material, which is prepared by uniformly mixing HfO2 and Nb through mechanical crushing, and in the adhesive layer material, the mass percentage of HfO2 is 60% to 90%, and the mass percentage of elemental Nb is 10% to 40%. The novel composite environmental barrier adhesive layer material has simple raw material composition, good uniformity, high use temperature and effectively improves the service life of the environmental barrier coating.

The present application relates to a kind of electron beam smelting-ultrasonic atomization powder system and method, belong to the preparation technical field of metal powder material, solve the problem such as high melting point metal powder difficult preparation in the existing metal powder preparation technology, medium introduction leads to low powder purity and high cost, powder sphericity is low, particle size is uncontrollable etc.The electron beam smelting-ultrasonic atomization powder system includes: electron beam system, vacuum system, cooling system, ultrasonic powder system and powder collection system.The system can realize powder preparation under high vacuum condition, avoid medium introduction and promote impurity removal, be beneficial to obtain low-oxygen ultra-pure powder;The energy density of electron beam is high, and the preparation of high melting point metal powder can be successfully realized;Ultrasonic atomization makes metal powder high sphericity, particle size is controllable, defect is less, especially suitable for the preparation of refractory metal (such as W, Mo, Ta) and active metal (such as Ti, Nb, Co, V) ultra-pure powder.

The invention relates to an additive manufacturing technology of a refractory metal material, and provides an induction heating degreasing method for 3D pure tungsten printing, which comprises the following steps of: preparing a binder system by taking polystyrene and polyformaldehyde as main binders, polymethyl methacrylate as a secondary binder and stearic acid as a surfactant; a pure tungsten precursor is obtained through a powder extrusion printing technology, and a high-density blocky tungsten sample is prepared through a high-temperature sintering technology after induction heating degreasing. According to the method, the high-performance, high-density and high-uniformity tungsten material can be prepared through the method that the pure tungsten precursor is prepared through the binder capable of being rapidly thermally decomposed and then induction heating degreasing is conducted, the efficiency of traditional thermal degreasing is greatly improved, and it is ensured that the material stably works in the high-temperature and high-radiation environment; the material is suitable for the fields of aerospace, nuclear industry and high-temperature application.

The present invention discloses a low-cost method for preparing tantalum-tungsten alloy powder, comprising the following steps: degassing: uniformly mixing ultrafine tantalum powder and tungsten powder in a desired proportion to obtain a mixed powder, placing the obtained mixed powder into a degassing device, evacuating and heating the mixture to volatilize and discharge gas impurities in the mixed powder; isostatic pressing: placing the degassed powder into a rubber mold sleeve, isostatically pressing the powder under a high-pressure environment to densify the powder, and placing the obtained molded body into a vacuum sintering furnace for sintering. The present invention can provide an effective way to manufacture low-cost, low-oxygen, low-carbon alloy powder for refractory metal spherical powder used in additive manufacturing. It can recycle and reuse low-grade, high-oxygen, unqualified tantalum-tungsten alloy fine powder waste to produce tantalum-tungsten alloy spherical powder that meets or exceeds industry standards, significantly reducing the production cost of powder preparation, saving time and effort, and improving work efficiency.

The invention provides a preparation method of refractory multi-principal-element alloy powder reinforced by a complex-component ceramic phase, and relates to the technical field of refractory multi-principal-element alloy powder preparation. The method comprises the following steps that refractory metal powder and non-metal powder are added into a solvent and a binder, the mixture is put into a mechanical stirring device to be stirred, and a slurry suspension solution is obtained; micron-sized spherical powder aggregates are prepared through a spray granulation method; a radio frequency induction plasma spheroidizing mode is adopted for preparing refractory multi-principal-element alloy spherical powder reinforced by a complex-component ceramic phase; the preparation method further comprises the step of obtaining the refractory multi-principal-element alloy powder reinforced by the irregular-shaped complex-component ceramic phase in a ball milling mode. The prepared complex-component ceramic phase reinforced refractory multi-principal-element alloy is uniform in component, compact in structure, low in impurity content and controllable in particle size distribution, and the preparation method is simple, easy to operate, environmentally friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.