195 results about "Niobium alloy" patented technology

The invention discloses a method for preparing a copper-chromium-niobium alloy high-thermal-conductivity part based on green laser SLM, and relates to the technical field of copper-chromium-niobium alloys. Comprising the following steps that copper-chromium-niobium alloy powder is pretreated; the pretreated copper-chromium-niobium alloy powder is laid on a base plate, green laser is adopted for selective laser melting printing, at least two layers of printing parameters with different energy densities are set in a layered energy gradient control mode, layered printing is carried out, a pore structure with the porosity in continuous gradient distribution is formed, and a pre-machined part is obtained; wherein the wavelength of the green laser is 500 nm to 550 nm, and the spot diameter of the green laser is 15 [mu] m to 30 [mu] m; and the pre-machined part is subjected to heat treatment, and the high-heat-conduction part is obtained. The copper-chromium-niobium alloy part is prepared through the green laser SLM technology, the layered energy density gradient control technology is adopted, and the problems that in copper-based alloy additive manufacturing, the reflectivity is high, the structure is limited, and the performance is insufficient are systematically solved.

The invention relates to the technical field of joint prostheses, in particular to an ankle joint prosthesis implantation system based on zirconium-niobium alloy, which comprises a tibia prosthesis (10), a talus prosthesis (30) and a liner (20), the tibia prosthesis (10) and the talus prosthesis (30) are both made of zirconium-niobium alloy material and are integrally formed by 3D printing, the tibia prosthesis (10) comprises a tibia body (101), and the liner (20) is arranged on the tibia body (101). The first bone contact layer (100) is integrally formed on the tibia body (101), and the first bone contact layer (100) is of a porous structure of which the pore diameter is gradually reduced from outside to inside; the talus prosthesis (30) comprises a talus body (301) and a second bone contact layer (300) integrally formed on the talus body (301), and the second bone contact layer (300) is of a porous structure with the aperture gradually reduced from outside to inside.

The invention belongs to the field of metal materials, and particularly relates to a niobium alloy material which mainly comprises the following elements in percentage by weight: 4%-8.5% of tantalum, 4%-8.5% of tungsten, 1%-3% of molybdenum, 0.8%-2.5% of zirconium, 0-0.2% of carbon and the balance of niobium. The invention further relates to a method for preparing the niobium alloy material. The compactness of the niobium alloy material and the tensile property at the room temperature and the high temperature are obviously improved.

The invention relates to a method for improving the high-temperature creep resistance of a TiAl alloy containing a B2 phase, which is characterized in that the microstructure of the high-niobium TiAl alloy is cooperatively regulated and controlled through phase diagram calculation, directional solidification and a heat treatment process, so that the alloy obtains a directional columnar crystal structure and a fine and dispersed B2 phase, and the high-temperature creep resistance of the TiAl alloy is enhanced. The problem that a B2 phase in an existing novel TiAl alloy is not beneficial to high-temperature creep resistance is solved.

The utility model relates to a niobium alloy surface treatment device which comprises a machine frame, and an intermittent feeding mechanism, a polishing mechanism and a material receiving mechanism are arranged on the machine frame. The polishing mechanism comprises a fixed support, and a first rotating roller is arranged at the upper end of the fixed support; a second rotating roller is arranged at the upper end of the linear sliding table, the linear sliding table can drive the second rotating roller to be close to or far away from the first rotating roller, when the second rotating roller is close to the first rotating roller, the blank can be placed between the second rotating roller and the first rotating roller and rotate, and when the second rotating roller is far away from the first rotating roller, the blank falls off between the second rotating roller and the first rotating roller, and discharging is completed; the polishing wheel set can be close to or far away from the first rotating roller and the second rotating roller; the material receiving mechanism is located below the first rotating roller and the second rotating roller and is arranged in an inclined mode relative to the machine frame. The first rotating roller is matched with the second rotating roller, automatic clamping and releasing of blanks are achieved through driving of the linear sliding table, and the problems that feeding and discharging are blocked and incoherent in a traditional polishing machine are solved.

The invention provides a high-strength niobium alloy processing method, which relates to the technical field of alloy processing, and comprises the following steps: step 1, ingot casting preparation: niobium, tungsten, tantalum, molybdenum, zirconium and carbon are subjected to powder mixing and ingot casting to obtain a first alloy product; step 2, extrusion processing: heating the first alloy product by adopting a medium-frequency induction furnace, and carrying out extrusion treatment by adopting an extrusion ingot supply device to obtain a second alloy product; step 3, forging: performing intermediate annealing treatment on the extruded second alloy product twice by adopting a first annealing process in the forging process to obtain a third alloy product; wherein free forging treatment is carried out on the alloy product between the two times of intermediate annealing treatment; and (4) finished product processing: carrying out finished product annealing treatment on the third alloy product by adopting a second annealing process to obtain the final high-strength niobium alloy. Wherein in the second annealing process, the temperature is increased to 1200-1450 DEG C at the speed of 18-20 DEG C / min, and heat preservation is conducted for 60-120 min. According to the scheme, the strength of the niobium alloy can be improved.

The invention provides a niobium alloy longitudinal seam tailor-welding method which at least comprises the following steps that a male die is manufactured, a copper pipe provided with a vent hole is arranged in a groove in the outer surface of the male die, and the vent hole faces the interior of the groove; the scalloped segments to be welded are fixed to the outer surface of the male die, the adjacent scalloped segments are close to each other to form a welding seam, and the welding seam is arranged at the opening of the groove; a wide pressing plate is applied to the position, close to the weld joint, of the outer surface of the scalloped segment and fixed, so that the inner surface of the scalloped segment is tightly attached to the outer surface of the male die, and the weld joint gap meets the spot welding requirement; after ventilation is conducted in the groove through the copper pipe for a certain time, spot welding is conducted along the weld joint; after spot welding is completed, the wide pressing plates on the two sides of the welding seam are replaced with narrow pressing plates and fixed; welding equipment is used for welding the welding seams, and the adjacent scalloped segments are welded and fixed; and after welding is finished, the narrow pressing plate is removed, and the welded scalloped segment is taken down.

The invention provides a composite current collector and a preparation method thereof, an electrode plate and a secondary battery. The composite current collector comprises a base film; the transition layer is arranged on the surface of at least one side of the base film; the transition layer is made of any one or a combination of at least two of metal niobium, metal tantalum, niobium alloy, tantalum alloy, niobium-based compound or tantalum-based compound; and the conductive layer is arranged on the surface of one side, relatively far away from the base film, of the transition layer. The transition layer with good compactness, stability and corrosion resistance is arranged between the base film and the conducting layer, on one hand, the binding power between the base film and the conducting layer can be improved, formation of holes in the conducting layer is reduced, and corrosion of electrolyte and a high-temperature environment are resisted; therefore, the charge-discharge cycle performance of the battery based on the composite current collector is improved; on the other hand, due to the arrangement of the transition layer, a closed loop formed by conduction of the positive and negative current collectors and thermal runaway of the battery caused by the closed loop are avoided, and the safety performance of the battery is improved.

The invention discloses a preparation method of a niobium and niobium alloy capillary tube, which comprises the following steps of: 1, filling high-purity argon into an inner hole of a seamless tube, and sealing two ends by argon arc welding; 2, performing surface oxidation on the pipe by adopting an electromagnetic induction constant-temperature oxidation device to obtain a pipe to be cold-drawn; 3, cold drawing to obtain a capillary tube; and 4, cleaning the outer surface of the capillary tube, cutting off the sealing head, carrying out finished product heat treatment, and straightening to obtain a finished tube. According to the method, the inner hole of the pipe is filled with argon, the two ends of the pipe are welded and sealed, an existing surface oxidation technology is changed, only the outer surface of the drawn pipe is oxidized, and the inner hole can be prevented from being oxidized during surface oxidation; meanwhile, the trouble brought to later cleaning due to the fact that oil stains pollute the inner hole in the cold drawing process can be avoided; the electromagnetic induction constant-temperature oxidation device is adopted, the thickness of an oxidation layer is very uniform, the yield can reach 100% in the later cold drawing process, and the yield is increased.

The invention relates to the technical field of alloys, in particular to a high-strength and high-toughness molybdenum-niobium alloy target material and a preparation method and application thereof, and the alloy target material comprises the following components in parts by weight: 12.23%-24.55% of niobium, 2.87%-6.54% of chromium, 3.45%-6.58% of titanium, 4.12%-7.52% of silicon, 5.32%-12.14% of zirconium, 14.12%-22.45% of aluminum hydroxide doped carbon nanotubes and the balance of molybdenum. The molybdenum-niobium alloy target material provided by the invention has excellent mechanical properties, and the electrical properties of the molybdenum-niobium alloy target material are improved greatly.

The invention discloses a method and a device for simulating the mechanical property of a zirconium-tin-niobium alloy under an irradiation condition, and mainly aims to solve the problems of lack of microstructure simulation of the irradiated zirconium-tin-niobium alloy and high cost, long period and low safety coefficient of mechanical property inspection of the irradiated zirconium-tin-niobium alloy. Comprising the following steps: establishing a microstructure model of the zirconium-tin-niobium alloy by adopting a phase field method, and introducing a rate theoretical model of irradiation defect evolution into the model to obtain a microstructure evolution model of the zirconium-tin-niobium alloy under the irradiation condition; the defect concentration under the irradiation condition is determined based on the model; the zirconium element concentration and the niobium element concentration under the irradiation condition are obtained, and the nonlinear elastic energy density of the zirconium-tin-niobium alloy is determined based on the obtained concentration values; determining a total free energy density function of the zirconium-tin-niobium alloy based on the nonlinear elastic energy density, the defect concentration, the zirconium element concentration and the niobium element concentration of the zirconium-tin-niobium alloy under the irradiation condition; and performing derivation processing on the total free energy density function to obtain a target stress tensor component.

A coating system includes a diffusion coating on a refractory metal or refractory metal alloy. The coating can be applied to a component such as a rocket engine component that includes a substrate including the refractory metal and is useful to protect the substrate from high temperature oxidation. The diffusion coating process employs an activator that includes a compound of the metal to be diffused into the surface of the substrate and is a vapor phase process in which the vapor includes metal from the activator and additional from the metal source being activated. Aluminum trifluoride can be used to activate an aluminum metal source to form an aluminide coating on a refractory metal-based alloy, such as a niobium alloy.

The invention discloses an electron beam welding method for a molybdenum alloy / niobium alloy dissimilar material with a preset middle layer. The electron beam welding method aims at solving the problem that solid crack defects exist in existing electron beam welding for the molybdenum alloy / niobium alloy dissimilar material. The electron beam welding method comprises the steps that firstly, the to-be-welded faces of the to-be-welded molybdenum alloy part, the to-be-welded niobium alloy part and the to-be-welded Re middle layer are mechanically polished and cleaned after being polished; secondly, the Re middle layer is placed between the to-be-welded faces of the clean molybdenum alloy part and the niobium alloy part to form a welding assembly; thirdly, welding parameters are set; and fourthly, electron beam welding is conducted. According to the method, the Re intermediate layer is adopted to carry out electron beam welding on the molybdenum alloy / niobium alloy, the characteristic that Re can improve the toughness of the molybdenum alloy is utilized, the metal brittleness of a weld joint is reduced, the crack tendency of a joint is greatly reduced, and a crack-free and high-strength molybdenum alloy / niobium alloy dissimilar material electron beam welding joint is obtained.

The invention discloses an aluminum-titanium-boron-carbon-niobium-rare earth intermediate alloy refiner and a preparation method and application thereof, and relates to the technical field of refiners, the refiner comprises the following components in percentage by mass: 4.5-5.5% of titanium, 0.8-1.2% of boron, 0.1-0.3% of carbon, 0.1-1.5% of niobium, 0.2-0.5% of rare earth and the balance of aluminum. The preparation method comprises the following steps: ball-milling and mixing a titanium source, a carbon source and aluminum powder, and hydraulically pressing into a precast block; heating an aluminum ingot until the aluminum ingot is completely molten, and then pressing the mixed powder precast blocks into an aluminum melt in batches to obtain a mixed melt; and sequentially adding an aluminum-boron alloy, an aluminum-niobium alloy and rare earth into the melt for melting, then adding carbon hexachloride for deslagging and refining, and then pouring into a mold for cooling. According to the refining agent, the grain structure of the aluminum-silicon alloy can be remarkably improved, the recession resistance and poison resistance of the high-silicon-content aluminum-silicon alloy are effectively improved through introduction of niobium and rare earth, and an effective refining effect on the aluminum-silicon alloy can be achieved.

This invention discloses a method for preparing a uniform microstructure on the surface of a containerless solidified niobium alloy for a space station, relating to the field of containerless materials science experimental technology. The method first screens for highly supercooled samples suitable for preparing a uniform microstructure using this method in containerless space station experiments; calculates or experimentally determines the primary phase dendrite growth rate, the cooling rate coefficient of radiative heat dissipation during the cooling stage, and the primary phase nucleation rate; and conducts containerless space station experiments to allow the niobium alloy to undergo deep supercooling and rapid solidification within a determined suitable supercooling range, thus obtaining a solidified alloy sample with a uniform surface microstructure. This invention actively controls the distribution of dendrites and eutectic phases, resulting in a surface microstructure with uniformly distributed dendrites and interdendritic eutectic phases.

The invention relates to the technical field of coating preparation, in particular to a niobium alloy surface thermal spraying coating, a preparation method and application, according to the method, a silicide coating is prepared on the niobium alloy surface, halide reaction embedding siliconizing treatment is conducted, and the niobium alloy surface thermal spraying coating is obtained; the silicide coating is prepared on the surface of the niobium alloy through the thermal spraying technology, the rough surface can be formed, anchoring sites are provided for follow-up halide reaction embedding siliconizing treatment, in the follow-up halide reaction embedding siliconizing treatment process, silicon is diffused to a base body to react to form a siliconizing diffusion layer, and metallurgical bonding of a coating-base body interface is achieved. In addition, a continuous transition area is formed between the siliconizing diffusion layer and the silicide coating, stress concentration caused by component mutation is reduced, the risk of interface cracking is effectively reduced, the service life of the coating is prolonged, and the problems that in the prior art, the interface bonding force between a thermal spraying MoSi2-based silicide coating and a base body is poor, and the service life is short are solved.

The invention relates to a preparation method of a molybdenum-niobium thermocouple wire, according to the method, dispersion strengthening and toughening are adopted, the problem of uniformity of molybdenum-niobium alloy components is solved through a method of combining high-energy ball milling, vacuum gradient sintering and electron beam melting, and the prepared molybdenum-niobium alloy thermocouple wire is high in thermoelectric stability and precision through drawing and surface treatment. The high-temperature-resistant strength and the neutron irradiation-resistant performance are good.

This invention discloses a plasma arc welding method for titanium / steel with pre-filled powder, belonging to the field of arc welding. The invention involves a bevel on the steel plate side of the weld joint, where a multi-element alloy powder is pre-filled. This multi-element alloy powder is a copper-titanium-iron-nickel-niobium alloy powder, with the following mass percentages: Cu: 35-45 wt%, Ti: 15-20 wt%, Fe: 15-20 wt%, Ni: 15-20 wt%, Nb: 3-5 wt%, to optimize the metallurgical properties of the titanium-steel interface. The upper part of the bevel is tightly fitted with the titanium, leaving a gap at the bottom for the multi-element alloy powder. During welding, the pre-filled multi-element alloy powder forms an alloy transition layer with the titanium-steel interface. After the welding wire melts, it fills the weld joint, forming the weld area together with the pre-filled powder. This method maintains the stability of the multi-element alloy powder and prevents it from being dispersed by the gas flow. This method overcomes the shortcomings of filler materials in traditional welding, avoids the high cost of laser coaxial powder feeding, and significantly reduces powder loss and particle size limitations in arc powder feeding.

The invention provides a method for preparing a high-purity niobium ingot by utilizing multistage refining and the high-purity niobium ingot, and the method comprises the following steps: (1) taking aluminum particles, niobium pentoxide, a heat generating agent and a slag former as raw materials, preparing an aluminum-niobium alloy ingot by adopting an exothermic method outside a furnace, and then carrying out surface treatment and crushing treatment to obtain aluminum-niobium alloy particles; (2) the aluminum-niobium alloy particles are subjected to horizontal electron beam smelting, and a smelted niobium plate is obtained; (3) stacking a plurality of smelting niobium plates, and then sequentially performing vacuum diffusion welding and vacuum arc smelting to obtain a primary niobium ingot; and (4) the primary niobium ingot is placed in a double-gun electron beam smelting furnace to be smelted, and the high-purity niobium ingot is obtained. The stable production of the high-RRR value high-purity niobium is realized by adopting a multi-stage refining process coupling system of an aluminothermy method, horizontal electron beam melting, diffusion welding, electric arc melting and double-gun electron beam melting, and the technical problems of high energy consumption, high cost, low production efficiency and the like in the traditional process are effectively solved.

The application relates to a connecting structure applied to a high-temperature and high-pressure heat exchanger, which comprises a tube sheet flange and a tube sheet flat cover, the tube sheet flange and the tube sheet flat cover are connected through a plurality of fixing members, a sealing film gasket is arranged between the tube sheet flange and the tube sheet flat cover, one side of the sealing film gasket is attached to the tube sheet flat cover, the other side of the sealing film gasket is outwardly provided with a boss, a sealing surface is formed between the boss and the tube sheet flange, a sawtooth groove is arranged on the sealing surface of the boss, the sawtooth groove is filled with graphite, and a low-carbon nickel-chromium-molybdenum-niobium alloy build-up welding layer is built up and welded on the sealing surface of the tube sheet flange, so that the sealing performance of the connecting structure is greatly improved, and medium leakage is avoided.

The invention belongs to the field of metal material surface engineering, and provides a high-strength wear-resistant shell alloy material and a preparation method thereof. According to the invention, a synergistic process route of alloy component optimization design, surface mechanical rolling and gas nitriding composite strengthening is adopted, and a double-layer gradient structure of a gradient nanocrystalline strengthening area and a nitriding diffusion area is constructed on a carbon-manganese-silicon-chromium-molybdenum-nickel-vanadium-niobium alloy matrix; gradient matching of surface layer superhardness and core part toughness with the surface Vickers hardness being 850-1100 HV0.1 and the core part Vickers hardness being 350-550 HV1 is achieved, the thickness of a gradient nanocrystalline strengthening area is 50-300 microns, the thickness of a nitriding diffusion area is 0.30-0.60 mm, the room-temperature tensile strength is 1100-1600 MPa, the percentage elongation after fracture is 8-20%, and the hardness of the surface layer superhardness and the core part toughness is not larger than 100%. The cross-domain coupling contradictions that extremely high hardness and overall toughness of the surface of a shell type wear-resistant material are difficult to consider at the same time and the residual stress gradient and the dimensional stability are difficult to control are solved, and the method has wide application value in manufacturing of wear-resistant parts such as shells, shells and protective covers under the high-strength wear working condition.

The present application relates to the technical field of welding material, in particular to a Nb-Ti-Zr-V brazing filler metal for Nb alloy honeycomb brazing, a brazing filler metal coating and a preparation method thereof. The Nb-Ti-Zr-V brazing filler metal for Nb alloy honeycomb brazing comprises 10-25% of Nb, 42-52.5% of Ti, 9-11.25% of Zr and 9-11.25% of V in terms of mass percentage. The purpose of the Nb-Ti-Zr-V brazing filler metal for Nb alloy honeycomb brazing, the brazing filler metal coating and the preparation method thereof is to solve the problem of poor welding rate when Ti-Zr-V brazing filler metal is used for honeycomb brazing.

A laser welding method of Nb alloy and nickel-based superalloy lap joint, in the method, the to-be-welded regions of the Nb alloy, titanium interlayer, rhenium interlayer and nickel-based superalloy are respectively subjected to fine grinding with sandpaper, polishing, distilled water cleaning, acetone immersion ultrasonic cleaning and drying; the Nb alloy, titanium interlayer, rhenium interlayer and nickel-based superalloy are sequentially stacked together in order to form a to-be-welded workpiece; the to-be-welded workpiece is placed in a low vacuum environment protected by inert gas, the stacked to-be-welded workpiece is tightly pressed by a pressing plate, and the vacuum degree of the low vacuum environment is 100 Pa to 500 Pa; laser lap welding of the to-be-welded workpiece is completed, and in the welding process, laser is vertically incident on the surface of the Nb alloy, sequentially passes through the Nb alloy, titanium interlayer, rhenium interlayer and nickel-based superalloy, so that the metals of the titanium interlayer and the rhenium interlayer are mutually fused with the Nb alloy and the nickel-based superalloy on both sides to form a lap joint.

The present invention relates to the technical field of medical orthopedic bionic materials, specifically a printed metal and polyethylene integrated knee joint prosthesis and a preparation method. Any one of tantalum, titanium, titanium alloy, zirconium-niobium alloy, and cobalt-chromium alloy is used to print a 3D printed metal component. The 3D printed metal component is integrally formed by 3D printing, and from top to bottom, there are a porous structure 1, a solid structure, and a porous structure 2. The porous structure 2 is combined with the polyethylene component by injection molding or hot pressing. The middle is the solid structure, and the bottom layer is the porous structure 2. The porous structure 2 is combined with the polyethylene. The polymer polyethylene material is ball milled to make the solid powder of the polymer polyethylene after molding more evenly distributed and the gap smaller, thereby improving the mechanical properties and internal wear properties of the material, and avoiding adverse events such as ion poisoning caused by metal wear debris.

The invention discloses a metallographic etchant for a Ti45Nb alloy and a corrosion method, and relates to the technical field of titanium-niobium alloys. The metallographic etchant for the Ti45Nb alloy comprises the following raw material components in percentage by volume: 73 to 77 percent of hydrofluoric acid and 23 to 27 percent of nitric acid. The corrosion method comprises the following steps of sample treatment, metallographic phase corrosion liquid preparation and metallographic phase corrosion. The problem that a large-deformation extrusion state and annealing state Ti45Nb alloy metallographic specimen is difficult to corrode can be solved, and the corroded metallographic structure is clear and easy to distinguish and analyze. The metallographic etchant is simple in component, and the corrosion method is convenient to operate, stable, reliable and good in corrosion effect.

The invention provides silicon-chromium-titanium-zirconium-hafnium alloy powder and a preparation method thereof, belongs to the technical field of high-temperature coatings, and aims to optimize the comprehensive performance of a niobium alloy spray pipe and increase the use temperature of the niobium alloy spray pipe. The invention provides silicon-chromium-titanium-zirconium-hafnium alloy powder which comprises the following components in percentage by weight: 50 to 73 weight percent of silicon, 15 to 25 weight percent of chromium, 5 to 10 weight percent of titanium, 5 to 10 weight percent of zirconium, 1 to 5 weight percent of hafnium and less than 0.315 weight percent of impurities. According to the high-temperature anti-oxidation coating obtained through the method, a quinary alloy system can generate a high-entropy effect, and the generated composite coating has excellent thermal stability and is good in binding force with a niobium alloy matrix. The alloy system has good high-temperature strength and oxidation resistance, and is suitable for protective coatings of high-temperature parts such as spaceflight rocket engines, aero-engines, nuclear energy equipment and the like.

The invention discloses a method for preparing a compact zirconium-niobium alloy based on hot pressing of coarse-grained spherical powder, which comprises the following steps: selecting the coarse-grained spherical zirconium-niobium alloy powder as a sintering raw material, then loading into a high-temperature-resistant mold, pre-pressing and forming, and then carrying out hot pressing under a vacuum condition to obtain the compact zirconium-niobium alloy. Hot pressing comprises a degassing pre-sintering stage and a high-temperature densification sintering stage, and pressure is synchronously applied in the heating process after the degassing pre-sintering stage is completed, so that powder particles are densified and sintered under the synergistic effect of high temperature and external pressure, and the compact zirconium-niobium alloy material is obtained. According to the method, coarse-grained zirconium-niobium alloy spherical powder is selected as a sintering raw material, coarse-grained spherical powder resources are effectively utilized, the powder preparation and forming cost is reduced, hot pressing including the degassing pre-sintering stage and the high-temperature densification sintering stage is matched, and the sintering quality is improved. And diffusion connection and pore closing among powder particles are promoted under the combined action of the temperature and the external pressure, and densification preparation of the zirconium-niobium alloy is achieved.

The application relates to the technical field of alloy materials, and discloses a high-temperature-resistant ternary nickel-based titanium-niobium alloy with a service temperature of 2500 DEG C and a preparation method thereof, which takes nickel, titanium and niobium as core components, and the atomic percentage composition is as follows: 44-46% of nickel, 43-45% of titanium and 9-11% of niobium; and 0.1-0.5% of one or more trace elements of oxygen, aluminum and chromium can be further added. Through optimization of component design, the alloy is thermodynamically stable under an ultrahigh-temperature environment of 2500-2900 DEG C. The preparation method adopts vacuum consumable arc melting or electron beam melting (vacuum degree >= 10 ‑3 Pa), melting, and solves problems such as component segregation and poor machining performance. The alloy is suitable for aerospace and nuclear industry ultrahigh-temperature parts, and the process is stable and easy to mass-produce.

The invention discloses a preparation method of a SiC whisker reinforced niobium-based composite material, which comprises the following steps: 1) performing high-energy ball milling treatment on SiC whiskers and niobium alloy powder according to a formula ratio to obtain niobium alloy-SiC whisker composite powder; (2) forming and printing the niobium alloy-SiC whisker composite powder by adopting a laser directional energy deposition technology to obtain a SiC whisker reinforced niobium-based composite material; the method further comprises the step that the SiC whisker reinforced niobium-based composite material obtained in the second step is subjected to heat treatment. According to the method, impurity pollution in the ball milling process is avoided by adopting the agate ball milling tank, and alternate rotation is performed by adopting planetary ball milling, so that the risk of whisker breakage is reduced while uniform mixing of SiCw and niobium alloy matrix powder is ensured; and in combination with the rapid solidification characteristic of laser directed energy deposition (L-DED), whisker agglomeration and interface reaction are effectively inhibited, the high survival rate of SiCw in a niobium alloy matrix and tough interface construction are achieved, and then the mechanical property of the composite material is effectively improved.

The invention relates to a niobium alloy surface treatment device which comprises a bottom frame. The two polishing mechanisms are arranged on the bottom frame and are perpendicular to each other; the turn-over mechanism is arranged between the two polishing mechanisms; the polishing mechanism comprises a supporting panel fixed to the top of the bottom frame, and a long groove is formed in the plate face of the supporting panel in the blank advancing direction. The polishing wheel set is arranged above the supporting panel and is used for polishing the top surface of the blank; the left side baffle and the right side baffle are arranged on the two sides of the bottom frame and used for guiding and polishing the two side faces of the blank; the feeding mechanism is used for driving the blank to advance on the supporting panel; according to the device, polishing treatment of the six surfaces of the niobium alloy plate can be automatically completed in the one-time clamping process, the risk of time waste and surface scratching caused by multiple times of turning over and positioning is fundamentally eliminated, and the machining efficiency and the product consistency are greatly improved.