26results about How to "Raise the recrystallization temperature" patented technology

The preparation process comprises the following steps: dissolving ammonium dimolybdate, ammonium rhenate and water at a high temperature, then adding zirconium hydroxide, uniformly mixing, carrying out vacuum drying, carrying out two-stage hydrogen reduction on the obtained precursor composite powder, and carrying out vacuum drying to obtain the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains, thereby obtaining the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains. Zirconium oxide reinforced molybdenum-rhenium composite powder obtained after reduction is subjected to cold isostatic pressing, pressureless sintering and hot isostatic pressing to obtain zirconium oxide reinforced molybdenum-rhenium alloy, and then the zirconium oxide reinforced molybdenum-rhenium alloy is obtained through high-temperature rolling and recrystallization annealing treatment. According to the method, atomic-level mixing of molybdenum and rhenium is achieved through liquid-phase doping, the microstructure of the molybdenum-rhenium alloy is more uniform and fine due to addition of ZrO2, the recrystallization temperature is increased, and the phenomenon that sintered grains of the molybdenum-rhenium alloy grow abnormally is relieved. And by optimizing the annealing process and regulating and controlling the annealing mode, grains are rearranged to form a more uniform microstructure, abnormal growth of the grains is further inhibited, and the high-temperature tensile strength and the ductility of the molybdenum-rhenium alloy are improved.

The invention discloses a preparation method of a high-temperature-resistant, high-strength, high-electric-conductivity and high-heat-conductivity copper-niobium heterogeneous nano composite fine filament, which comprises the following steps of: 1, winding a copper strip and a niobium strip, placing the wound copper strip and niobium strip in a copper sheath, carrying out homogeneous heating and isothermal hot extrusion deformation, and then carrying out multi-pass straight drawing, intermediate annealing and disc drawing to obtain a copper-niobium composite wire; 2, bundling and assembling the copper-niobium composite wires, placing the copper-niobium composite wires in a copper sheath, carrying out homogeneous heating and isothermal hot extrusion deformation, and then carrying out multi-pass straight drawing, intermediate annealing and disc drawing to obtain a copper-niobium multi-core composite round wire; and 3, performing multi-pass drawing and vacuum annealing on the copper-niobium multi-core composite round wire in sequence. The ultra-plastic deformation process combining copper and niobium winding combination with cluster drawing is adopted, the fine wire with high tensile strength, good bending and tensile plasticity, excellent high-temperature thermal stability and high-temperature stress relaxation resistance, excellent radiation resistance and excellent strong current matching is obtained, the process is simple, control is easy, and the method is suitable for industrial production. The industrial batch production is easy to realize.

The invention relates to the technical field of aluminum alloy materials, in particular to an aluminum alloy material, an aluminum alloy conductor wire core and a preparation method and application of the aluminum alloy conductor wire core. The aluminum alloy material comprises, by mass, 0.3%-1.0% of iron (Fe), 0.03%-0.2% of magnesium (Mg), 0.1%-0.8% of manganese (Mn), 0.08%-0.3% of zirconium (Zr), 0.004%-0.03% of boron (B), 0.015%-0.65% of rare earth (RE), 0-0.12% of silicon (Si) and the balance aluminum (Al) and inevitable impurities, the single impurity is not larger than 0.03%, and the sum of the impurities is not larger than 0.1%. Wherein the rare earth (RE) is prepared from the following components in percentage by mass: 0.003 to 0.1 percent of lanthanum (La), 0.004 to 0.15 percent of cerium (Ce) and 0.008 to 0.4 percent of scandium (Sc). The prepared aluminum alloy material has the characteristics of high conductivity, high strength, heat resistance, corrosion resistance and good fracture and impact toughness, is very suitable for being used as a cable conductor, and is particularly applied to places with high requirements on high temperature, vibration, movement, corrosion and the like, such as power cables, electrical connecting wires, drag chain cables applied to metal smelting places and the like.

The invention relates to molybdenum alloy composite powder with a micro-nano multi-scale configuration and a preparation method of molybdenum alloy, MoO2 powder, Ti3Al and TiC are mixed, ground and spray-dried to obtain precursor composite powder, the precursor composite powder is subjected to high-temperature reduction to obtain the molybdenum alloy composite powder with the micro-nano multi-scale configuration, then cold isostatic pressing blank pressing is performed, and the molybdenum alloy composite powder with the micro-nano multi-scale configuration is obtained. And then vacuum hot pressed sintering is conducted at the high temperature, and the molybdenum alloy sintered blank of the micro-nano multi-scale configuration is obtained. The layered secondary phase is introduced, the secondary phase provides a confined growth space for molybdenum particles in the powder reduction process, the particle size of the powder is effectively reduced, the molybdenum alloy composite powder of the micro-nano multi-scale configuration is obtained, the nano molybdenum particles are preferentially molten in the high-temperature sintering process, sintering densification is promoted, and the sintering temperature is lowered. The interface bonding relation between a secondary phase and a matrix is improved, the structure of the obtained molybdenum alloy sintered blank is more uniform, the recrystallization temperature of the molybdenum alloy is increased, and the strength of the molybdenum alloy at the ultrahigh temperature is remarkably improved.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

The preparation technology comprises the steps that molybdenum dioxide powder, Re powder, Ti powder, C powder and Al powder are subjected to ball milling and mixing to obtain precursor molybdenum-rhenium composite powder, molybdenum-rhenium alloy composite powder is obtained through two-stage hydrogen reduction, then high-temperature large-deformation rotary swaging is conducted after cold isostatic pressing and pressureless sintering are conducted, and the molybdenum-rhenium alloy is obtained. And finally, the high-temperature-resistant molybdenum-rhenium alloy with high-density dislocation is obtained. The dislocation density of an alloy matrix is increased by introducing a secondary phase, the recrystallization temperature of the molybdenum-rhenium alloy is increased, ultrahigh-temperature large-deformation rotary swaging of the molybdenum-rhenium alloy is achieved, high-density dislocation is further introduced through high-temperature large-deformation rotary swaging, the high-temperature tensile strength of the molybdenum-rhenium alloy is improved, and meanwhile the plasticity and toughness of the molybdenum-rhenium alloy are improved; and a wider application prospect is provided for application of the molybdenum-rhenium alloy in a more extreme environment.

The invention discloses a heat-resistant high-strength aluminum alloy and a preparation method thereof, and relates to the technical field of metal materials. The preparation method comprises the following steps: mixing metal erbium and metal titanium with other metal raw materials of the aluminum alloy, carrying out heat treatment on erbium and titanium to form a nano precipitated phase with a double-layer structure, and homogenizing a metal melt through ultrasonic treatment; metallic titanium and a metastable phase can form a complex strengthening phase at a high temperature, eutectic silicon and multi-phase metal form a compound net structure, and the heat resistance of the alloy is remarkably improved; secondly, porous boron carbide particles are prepared through vacuum sintering and ground to the nanoscale, the content of impurity elements is reduced after boronizing reaction, grains can be refined to form fine dispersed precipitated phases, growth of the grains is hindered, the recrystallization temperature is increased, and the heat resistance is optimized; the alloy is subjected to high pressure through two-stage cold pressing, so that gas in the alloy is exhausted and tightly combined, the strength and compactness of the alloy are further improved, and the mechanical property is improved. The prepared aluminum alloy has the effects of high strength and high heat resistance.

The invention relates to the field of metal processing, and provides a horizontal continuous casting production process of a large rotor winding double-hole copper bar, which remarkably improves the product quality and the production efficiency through innovative design and optimization. The process mainly comprises the steps of raw material preparation, smelting, heat preservation, horizontal continuous casting, casting blank forming, cold rolling, drawing, aftertreatment, quality inspection and the like. Wherein in the raw material preparation stage, the material performance is optimized by accurately controlling the proportion of alloy elements, for example, 0.03%-0.1% of silver, 0.02%-0.05% of magnesium, 0.03%-0.08% of zirconium and 0.02%-0.06% of chromium are added. And the uniformity is ensured by adopting a double-frequency induction technology for smelting. The innovation of the horizontal continuous casting link is particularly prominent, the crystallizer body made of high-heat-conductivity-coefficient copper alloy is matched with the high-purity isostatic pressing graphite double-hole mold, and accurate segmented cooling control is achieved. The most characteristic is that the middle cooling structure effectively solves the problem of non-uniform cooling in the solidification process of the double-hole copper bar by forming a spraying outlet in the rear half section of the mold rod and adopting a high-frequency pulse spraying technology.

This invention discloses a lanthanum-iron-molybdenum alloy cutting wire and its manufacturing method. The lanthanum-iron-molybdenum alloy cutting wire is made by adding 0.1-0.5% lanthanum nitrate solution and 0.01-0.05% ferric nitrate solution to molybdenum dioxide powder. The manufacturing method involves loading molybdenum dioxide powder into a mixer; mixing the lanthanum nitrate solution and ferric nitrate solution to form a mixture; loading the mixture into a feeder; adding the mixture to the mixer using the feeder while stirring; washing the feeder with pure water, and adding the washed solution to the mixer while stirring; thoroughly mixing and stirring in the mixer for 20-80 minutes; heating and drying after thorough mixing; cooling; and then processing the alloy wire. With a diameter of Φ0.18mm, its tensile strength can reach 2600-3500 N / mm². 2， When used in wire EDM, it is more wear-resistant and has a longer lifespan. Lanthanum-doped iron-molybdenum wire has a high recrystallization temperature, expanding the temperature range and extending the lifespan of the molybdenum wire.

The invention relates to the technical field of alloys, in particular to an aluminum alloy, a preparation method thereof and a crushing test method of the aluminum alloy. The aluminum alloy comprises the following components in percentage by mass: 0.08%-0.15% of La, 0.05%-0.15% of Al, and the balance of Al 0.55% to 0.65% of Si; 0.48% to 0.58% of Mg; from 0.15% to 0.25% of Fe; mn, 0.15% to 0.25%; cr, from 0.06% to 0.12%; ti, 0.05% to 0.10%; and the balance of Al. By adding the elements, the strength and plasticity of the aluminum alloy are improved, the comprehensive performance is improved, and the crushing performance of the aluminum alloy is improved.

The invention belongs to the technical field of high-temperature alloy preparation, and relates to an oversized fine grain N06625 alloy plate and a rolling method and application thereof. The rolling method comprises the following steps: step 1, selecting a rolling blank with a specific specification; 2, the rolled blank is pretreated, and it is guaranteed that the surface of the rolled blank is free of cracks; 3, heating the rolled blank by using a heating furnace, and preserving heat; and 4, after heat preservation is finished, the alloy plate is discharged out of the furnace and subjected to large-deformation rolling, and the target N06625 alloy plate is obtained. The technical problems that a uniform structure and a fine grain structure are difficult to form in a traditional thermal forming process, and the risk of crystal mixing exists are solved; in addition, due to the fact that N06625 is difficult to form and a hot working window is narrow, N06625 can be formed into an oversized specification at a time through the method, the structure is uniform, and the grain size is larger than or equal to grade 8.

A high-performance near-pure zinc alloy and its preparation method and application, belonging to the technical field of zinc alloys. The alloy composition is that the Zn content is ≥99.5%, and the remaining trace alloy elements include at least 2 of the following 14 elements: Mg, Mn, Li, Cu, Ag, Ca, Sr, Fe, Zr, Ti, Al, C, Ga, Si. The yield strength of the alloy is ≥250MPa, the tensile strength is ≥320MPa, the elongation is ≥25%, the mechanical property change in room temperature storage within 1 year is ≤5%, the maximum bending force is ≥2kN, the stress corrosion sensitivity factor is ≤15%, the corrosion pit size is ≤15μm after immersion for 60 days, and the standard deviation of the corrosion pit size is ≤3μm. The alloy is suitable for the preparation of degradable stents, bone implant devices, intestinal, vascular or neural anastomosis devices or staples, vascular clips, guided bone and tissue regeneration membranes, artificial heart valves, meningeal repair membranes, soluble bridge plugs for oil drills, fracturing balls, zinc alloy die castings, electrogalvanized materials, construction zinc materials, zinc materials for batteries, zinc materials for printing, and zinc-based alloy solders.

The invention discloses a reed with good durability and a preparation method thereof, and relates to the technical field of reeds. The preparation method of the reed with good durability comprises the following steps: taking raw materials, smelting the raw materials in an argon atmosphere, and casting and cooling the raw materials to obtain a cast ingot; the cast ingot is subjected to homogenization treatment, surface milling is conducted after furnace cooling, and then blooming is conducted; annealing is carried out after primary rolling, finish rolling is carried out, a thin strip is obtained, stamping cutting and annealing are carried out, and a rough reed is obtained; the rough reed is taken, cleaned, dried and polished and then placed in a passivation solution to be soaked, and the finished reed is obtained; the passivation solution comprises the following raw materials in percentage by mass: 1-4% of benzotriazole, 0.3-0.5% of a surfactant, 2-5% of a corrosion inhibitor, 12-15% of phytic acid, 1-2% of citric acid, 2-5% of ethanol and the balance of deionized water. The finally prepared reed has a hydrophobic surface and good corrosion resistance.

The invention provides a 7-series aluminum alloy backward extrusion automobile bar production method which comprises the steps of burdening, casting, cast bar homogenization, extrusion, bar quenching, stretching and cutting, aging treatment and the like, a first-stage homogenization system and a second-stage homogenization system are adopted in cast bar homogenization, in the extrusion process, a backward extrusion die comprises a rear chamber and a working belt which are connected in sequence, and the working belt is provided with a first-stage homogenization system, a second-stage homogenization system and a second-stage homogenization system. The rear chamber comprises a first conical area, a cylindrical area and a second conical area which are sequentially connected. By optimizing the alloy components, improving the casting process, adjusting the structural design of the die and accurately controlling the extrusion process parameters, the continuous online quenching production is realized, the surface quality defects are obviously reduced, the rejection rate and the production cost are reduced, and the production efficiency is improved.

A kind of low cracking tendency mandrel steel adopting continuous casting big square billet rolling and its manufacturing method, its component mass percentage is as follows: C 0.33~0.38%, Mn 0.40~0.60%, Si 0.80~1.25%, Cr 4.75~5.25%, Mo 1.10~1.20%, V 0.30~0.40%, Nb 0.035~0.06%, Ti 0.012~0.020%, H≤2.0ppm, the rest is Fe and other inevitable impurities.The application is designed by Nb-Ti microalloying and lower H content, combined with high-temperature heating and long-time holding, effectively ensures that the deformation amount in rolling process does not fall within the range of critical deformation amount, avoids the formation of local abnormal coarse structure caused by insufficient local recrystallization, avoids the formation of low plasticity and toughness structure, thereby reduces the cracking tendency under residual tensile stress and the cracking tendency of hydrogen-induced delayed cracking, at the same time, the interval time between rolling and annealing is greatly extended from original 24h to 72h, greatly reduces the cracking proportion in the process of waiting annealing after rolling, improves the yield, is beneficial to save cost, reduce energy consumption, improve efficiency.

The invention relates to the technical field of engine parts, and discloses a cam shaft, a preparation method thereof and an engine. The cam shaft comprises a shaft body and a cam arranged on the shaft body; the shaft body is made of aluminum alloy, and the aluminum alloy is prepared from the following components in percentage by mass: 0.20 to 0.40 percent of Mn, 0.25 to 0.45 percent of Cu, 0.02 to 0.10 percent of Ti, 0.07 to 0.18 percent of Zr, 5.20 to 7.20 percent of Zn, 1.20 to 2.20 percent of Mg, 0.07 to 0.35 percent of Re and the balance of aluminum; the cam is made of steel or aluminum alloy; when the cam is made of aluminum alloy, the cam and the shaft body are the same in component, the shaft body and the cam are integrally formed, a hard anodic oxidation layer is arranged on the surface of the cam, and tiny holes are formed in the hard anodic oxidation layer and blocked by Teflon. The camshaft provided by the invention has the characteristic of light weight on the premise of meeting the use requirements of an engine.

The present invention relates to the field of metal processing, and provides a horizontal continuous casting production process for double-hole copper bars of large rotor windings, which significantly improves product quality and production efficiency through innovative design and optimization. The process mainly includes steps such as raw material preparation, smelting, heat preservation, horizontal continuous casting, ingot forming, cold rolling, drawing, post-processing and quality inspection. Among them, the raw material preparation stage optimizes the material properties by accurately controlling the alloy element ratio, such as adding 0.03-0.1% silver, 0.02-0.05% magnesium, 0.03-0.08% zirconium and 0.02-0.06% chromium. Dual-frequency induction technology is used in smelting to ensure uniformity. The innovation of the horizontal continuous casting link is particularly prominent. The crystallizer body made of high thermal conductivity copper alloy is combined with a high-purity isostatic graphite double-hole mold to achieve precise segmented cooling control. The most distinctive feature is the middle cooling structure, which effectively solves the problem of uneven cooling during the solidification process of the double-hole copper bar by setting a jet outlet in the rear half of the mold rod and using high-frequency pulse jet technology.

The invention provides high-strength and high-hole-expansion steel. The high-strength and high-hole-expansion steel comprises, by mass, 0.04%-0.12% of carbon, smaller than or equal to 0.1% of silicon, 1.3%-1.7% of manganese, smaller than or equal to 0.002% of sulfur, smaller than or equal to 0.015% of phosphorus, 0.01%-0.03% of niobium, 0.0014%-0.06% of vanadium, 0.1%-0.15% of titanium, 0.08%-0.18% of molybdenum, 0.02%-0.05% of acid-soluble aluminum and smaller than or equal to 0.006% of nitrogen. The high-strength and high-hole-expansion steel prepared by the preparation method disclosed by the invention has relatively good hole expansion property while considering the strength, and is high in practicability and worthy of popularization.

The invention belongs to the technical field of aluminum-based materials, and particularly relates to a high-strength and high-elongation 1100D aluminum foil and a preparation method thereof. Through composite addition of multiple elements such as RE and Zr and fine process control, the material strength is remarkably improved while good plasticity and machinability of the aluminum foil are guaranteed, the prepared aluminum foil overcomes the problem that the strength of a traditional 1100 series alloy is low or the ductility is sharply reduced after the strength is improved, and the comprehensive mechanical property of the aluminum foil is superior to that of a conventional product.

The application discloses a two-dimensional nitrogen-doped carbon material loaded rhenium-based alloy nanoparticle electrocatalyst, and a preparation method thereof. The preparation method comprises the following steps: dissolving a rhenium-based metal salt, a transition metal salt, a purine small molecule and an inorganic salt in water to perform a hydrothermal reaction, so as to obtain a two-dimensional structure precursor; and calcining the two-dimensional structure precursor under the protection of an inert gas, so as to obtain the electrocatalyst. The high-melting-point rhenium metal is used to form alloy nanoparticles with the transition metal, so that the defects of sintering of the transition metal-based catalyst in a high-temperature synthesis process can be effectively avoided, the aggregation and growth of the alloy nanoparticles in the high-temperature synthesis process are prevented, the alloy nanoparticles are uniformly and highly densely loaded on the surface of a two-dimensional carbon nitride carrier, the proportion of surface metal atoms is greatly increased, and finally, the prepared electrocatalyst has good hydrogen evolution reaction catalytic activity and catalytic stability.

The invention relates to the field of metal materials, in particular to a niobium-containing 304 austenitic stainless steel plate for nuclear power and a preparation method of the niobium-containing 304 austenitic stainless steel plate for nuclear power, and the niobium-containing 304 austenitic stainless steel plate comprises the following components in percentage by mass: 0.02%-0.06% of C, 1.00%-2.00% of Mn, 0.20%-0.75% of Si, 0-0.030% of P, 0-0.005% of S, 18.00%-19.50% of Cr, 8.00%-10.50% of Ni, 0.2%-0.8% of Nb, 0-0.10% of Cu, 0-0.10% of Co, 0-0.10% of N and the balance of Fe and other inevitable impurities. The 304 austenitic stainless steel is improved, and the niobium element is added, so that stable production of the 304 austenitic stainless steel plate for nuclear power can be ensured, the 304 austenitic stainless steel plate has excellent grain size, intergranular corrosion resistance and mechanical property, and the design requirements of steel for nuclear power are met.

The present invention discloses a high-strength and tough die-cast aluminum alloy material without heat treatment and a preparation method thereof, belonging to the technical field of aluminum alloy materials. The weight percentage of each component in the die-cast aluminum alloy is Si: 6.0-12%, Mg: 0.1-0.45%, Mn: 0.3-0.85%, Cr: 0.05-0.2%, Sr: 0.05-0.15%, Zr: 0.05-0.12%, Ni: 0.03-0.07%, Fe<0.2%, the total amount of other impurities is ≤0.5%, and the balance is Al. The die-cast aluminum alloy phase includes a matrix α-Al solid solution, Si and ZrNi phases; the ZrNi phase is uniformly distributed near the grain boundary of the die-cast aluminum alloy, and has a strength of 5×10 ‑4 Pa hydrogen absorption equilibrium pressure and hydrogen adsorption capacity exceeding 200ml / g, and no melting occurs when heated to 1010℃, the hydrogen content of aluminum liquid is ≤0.04ml / 100g Al, and the slag content is ≤0.008mm 2 / kg, the obtained heat-treatment-free die-casting aluminum alloy has excellent strength and toughness and high resistance to hydrogen embrittlement.

The invention provides a production method of a rear floor boundary beam profile for an automobile, which comprises the steps of burdening, casting, cast rod homogenization, extrusion, bar quenching, stretching and cutting, aging treatment and the like, specifically, the total content of Mn and Cr is strictly controlled within the range of 0.40%-0.50%, the recrystallization temperature is increased, grain growth in the extrusion process is effectively inhibited, and the yield of the profile is improved. The problems that the size precision of a long-cantilever large-opening profile is difficult to control and the comprehensive welding performance is poor are solved by adjusting extrusion process parameters such as the ingot casting heating temperature and the mold temperature, the large-size profile can be integrally formed, repeated welding is not needed, and the production cost is reduced. The overall mechanical property of the profile is improved, the production efficiency is improved, the production cost is reduced, the tensile strength, the yield strength, the ductility and the exfoliation corrosion resistance of the profile can all meet the standard, the comprehensive performance is excellent, and the requirements of the aluminum profile for automobiles for integration, high performance and high precision are met.

The present invention discloses a low-Cr and highly corrosion-resistant FeCrAl-based alloy and a preparation method thereof, belonging to the technical field of new structural materials. The lower Cr content in the FeCrAl-based alloy disclosed in the present invention can enhance the toughness of the alloy and significantly reduce the radiation embrittlement phenomenon of the fuel cladding tube under high-intensity neutron irradiation. At the same time, the high-density solid solution second phase in the FeCrAl-based alloy has the characteristics of capturing radiation defects and inhibiting radiation damage, and has very excellent high-temperature radiation damage resistance. The low-Cr and highly corrosion-resistant FeCrAl-based alloy prepared by the present invention has better uniform corrosion performance under normal working conditions and high-temperature corrosion resistance in a high-temperature water vapor environment than existing service materials. The alloy prepared by the present invention has very high mechanical properties and thermal stability of the structure at high temperatures.

The invention relates to an easy-to-weld molybdenum-rhenium alloy and a preparation process thereof, ammonium tetramolybdate, Re powder and ZrC powder are uniformly mixed and then calcined, then hydrogen reduction is performed to obtain alloy composite powder, and the alloy composite powder is sequentially subjected to cold isostatic pressing, pressureless sintering, hot isostatic pressing sintering, high-temperature rolling and annealing to obtain a high-density easy-to-weld molybdenum-rhenium alloy plate. The ZrC particles are added into the molybdenum-rhenium alloy, the prepared molybdenum-rhenium-zirconium carbide composite powder particles are submicron and nearly spherical, the powder sintering activity is effectively improved, grain growth in the sintering process is effectively hindered through introduction of secondary phase zirconium carbide, and grains can be refined. Zirconium carbide is dispersed and distributed in a high-density and easy-to-weld molybdenum-rhenium alloy matrix, in the welding process, zirconium carbide can absorb oxygen at an alloy grain boundary, purify the grain boundary and generate zirconium oxide in situ, recrystallization embrittlement caused by rapid growth of grains in the welding process is inhibited, the strength, plasticity and toughness of the molybdenum-rhenium alloy can be effectively improved, and the welding performance of the molybdenum-rhenium alloy is improved.

This invention belongs to the technical field of welding materials and discloses a high-temperature resistant multi-element high-entropy alloy brazing filler metal and its preparation method. By mass fraction, it comprises the following components: Co 15%–25%, Ni 15%–25%, Cr 15%–25%, Fe 15%–25%, Cu 15%–25%, Mn 0.1–3%, Si 0.1–6%, B 0.1–5%, Sc 0.5–0.9%, and Y 0.1–1%. The preparation method of this invention is simple to operate, low in cost, highly efficient, and highly adaptable, showing great application potential. The high-entropy alloy brazing filler metal of this invention can be used in high-temperature, high-pressure, and corrosion-resistant environments after welding.