772 results about "Tungsten alloy" patented technology

The invention belongs to the technical field of powder metallurgy, and particularly relates to a high-strength tungsten alloy wire and a preparation method thereof, lanthanum oxide is uniformly doped through a ball-milling mixing and microwave sintering method, the recrystallization temperature of tungsten crystal grains is reduced by coordinating logarithmic strain of a rotary hammer, an annealing process and the like, the tungsten crystal grains uniformly grow, and the high-strength tungsten alloy wire is prepared. The wire diameter of the high-strength tungsten alloy wire is smaller than 30 microns, the tensile strength of the high-strength tungsten alloy wire is larger than or equal to 6200 MPa, and the percent of pass of the high-strength tungsten alloy wire is larger than or equal to 80%.

The invention relates to the technical field of tungsten alloy, and discloses a tungsten alloy material and a preparation method thereof.The tungsten alloy material comprises, by mass, 90-100 parts of modified tungsten powder, 8-10 parts of nickel powder, 5-7 parts of iron powder, 4-6 parts of cobalt powder and 1-3 parts of modified carbon fibers. The nickel powder, the iron powder and the cobalt powder in the molten state permeate into the tungsten powder through pores evenly distributed in porous carbon on the surface of the modified tungsten powder to form a uniform and compact alloy material, and the situation that due to the large melting point difference between the tungsten powder and the nickel powder, the iron powder and the cobalt powder, the nickel powder, the iron powder and the cobalt powder are distributed unevenly in the tungsten alloy material, and the mechanical strength of the alloy material is reduced is avoided; the pretreated silicon carbide whiskers are adhered to the surface of the carbon fiber loaded with the graphene oxide to form modified carbon fiber, so that interface stress can be absorbed and dispersed, stress concentration is reduced, cracks and debonding phenomena at an interface are prevented, and the mechanical performance of the tungsten alloy material is enhanced.

The invention discloses a tungsten alloy material containing a silicon carbide reinforced Al2O3-SiO2-based multiphase ceramic coating and a preparation method of the tungsten alloy material, and belongs to the field of ceramic material preparation. The method comprises the following steps: ball-milling and mixing powder raw materials containing modified silicon carbide, aluminum oxide, silicon dioxide and lead oxide with a solvent, and defoaming to obtain ceramic slurry; the ceramic slurry is brushed on the surface of a tungsten alloy matrix subjected to surface pretreatment, and after drying, vacuum sintering is performed to obtain the tungsten alloy. The compact silicon carbide reinforced Al2O3-SiO2-based multiphase ceramic coating is introduced to the surface of a tungsten alloy matrix, the hardness, the high-temperature oxidation resistance and the high-temperature carburization resistance of a tungsten alloy material are remarkably improved, the stability of the coating can be improved through the silicon carbide distributed in a dispersed point shape, the thermal expansion coefficient of the coating is evenly reduced, and the hardness, the high-temperature oxidation resistance and the high-temperature carburization resistance of the tungsten alloy material are improved. The thermal expansion coefficient difference value between the multiphase ceramic coating and a tungsten alloy matrix is reduced, and the thermal shock resistance of the coating is improved.

The utility model discloses an ultra-high manganese steel jaw plate inlaid with alloy bars, which comprises a jaw plate body, a plurality of slots are arranged in the jaw plate body, and reinforcing components are arranged in the slots. The reinforcing assembly comprises an alloy bar body and an insertion rod. The alloy bar bodies are connected into a whole, the alloy bar bodies are made of tungsten alloy bars and have high hardness, corrosion resistance and thermal stability, the strength of the jaw plate body is improved, and the service life of the jaw plate body is prolonged; according to the jaw plate, through the arrangement of the T-shaped protruding blocks and the bolts, the T-shaped protruding blocks below the jaw plate body are aligned with the T-shaped grooves in the mounting plate, the T-shaped protruding blocks are clamped into the T-shaped grooves, and therefore primary mounting of the jaw plate body is completed, the first screw holes are aligned with the second screw holes, the jaw plate body can be fixedly mounted on the mounting plate through the bolts, and mounting is easy and convenient.

The invention relates to the field of high-temperature anti-oxidation coatings, in particular to a tantalum-tungsten alloy surface high-temperature anti-oxidation composite coating and a preparation method thereof.The coating is composed of two layers of coatings with different components, the thermal expansion coefficients of the coatings and a base body are matched, the thermal expansion coefficients of the coatings are matched, and residual stress and thermal stress are reduced. The coating is prepared by adopting an embedding boriding and slurry melting method, and the used material components comprise ZrB2, MoSi2, 8YSZ, B, La2O3, Al2O3, NaF, TaSi2 and the like. The preparation method specifically comprises the following steps: putting a substrate into embedding powder for boronizing treatment, then mixing a coating material with ethanol and a binder, putting the mixture into a ball mill for wet mixing to prepare coating slurry, spraying the coating slurry on the surface of the substrate, and putting the substrate into a vacuum tube furnace for sintering to prepare a coating, thereby obtaining the high-temperature anti-oxidation composite coating. The binding force between the developed coating and the tantalum-tungsten alloy matrix is strong, and the tantalum-tungsten alloy matrix can be protected from oxidation corrosion or the oxidation rate can be slowed down within 500-2500s at the high temperature (2000 DEG C or above).

The invention discloses a rare earth modified tungsten carbide alloy and a preparation method thereof, and belongs to the technical field of tungsten carbide alloys. The rare earth modified tungsten carbide alloy comprises 80 wt.%-90 wt.% of a hard phase and 10 wt.%-20 wt.% of a matrix, and the hard phase is uniformly distributed in the matrix; the hard phase comprises a rare earth modified tungsten carbide inner core, the rare earth modified tungsten carbide inner core is coated with a nano tungsten carbide shell, the rare earth modified tungsten carbide inner core accounts for 85-95 wt.% of the mass of the hard phase, and the nano tungsten carbide shell accounts for 5-15 wt.% of the mass of the hard phase. By the adoption of the rare earth modified tungsten carbide alloy and the preparation method thereof, the problem that an existing tungsten carbide alloy is poor in hardness and abrasion resistance can be solved, and the toughness of the tungsten carbide alloy can be improved.

The invention discloses a preparation method of a high-strength tungsten alloy wire with the length exceeding 150 km for photovoltaic silicon wafer cutting, and belongs to the technical field of tungsten wire manufacturing. The preparation method of the high-strength tungsten alloy wire comprises the following steps that ammonium paratungstate and lanthanum oxide are added into water to obtain a mixed solution, and the mixed solution is dried, calcined and reduced to obtain mixed tungsten powder; pressing the mixed tungsten powder into a rod shape, and sintering to obtain a sintered tungsten rod; annealing the sintered tungsten rod to obtain a completely recrystallized rod, and performing rotary swaging to obtain a rotary swaged tungsten rod; drawing the rotary swaged tungsten rod to obtain a tungsten filament with the diameter of 0.37-0.41 mm, and annealing to obtain a tungsten filament A; drawing the tungsten filament A to obtain a tungsten filament with the diameter of 0.16-0.18 mm, and annealing to obtain a tungsten filament B; and drawing the tungsten filament B to obtain a tungsten filament with the diameter of 36-38 microns, namely the high-strength tungsten alloy wire. The invention discloses an annealing process in a tungsten alloy wire drawing process, which can effectively reduce the generation of defects such as cracks in a machining process.

The medium-temperature radial forging method comprises the steps that pretreatment is conducted, specifically, a niobium-tungsten alloy extrusion bar blank is heated for 60-180 minutes at the temperature of 750-950 DEG C, rapid forging and straightening are conducted, and a medium-temperature radial forging bar blank is obtained and annealed for 60-120 minutes at the temperature of 1250-1450 DEG C; medium-temperature radial forging is conducted, specifically, a two-step method is adopted, in the first step, a bar blank is preheated to 80-100 DEG C and coated with Ta1350 high-temperature glass powder, heat preservation is conducted for 90-180 minutes at the temperature of 1050-1150 DEG C, and the bar blank is forged into a bar with the diameter of 70 + / -1 mm in the mode that the diameter is reduced by 7-10 mm every time; and in the second step, the heating and coating processes are repeated, the diameter is reduced by 5-7 mm every time, and the bar with the required specification is manufactured. By optimizing the medium-temperature forging and annealing process, the fine grain structure is controlled, the high-temperature mechanical property, creep resistance and oxidation resistance of the material are improved, and the material is suitable for aerospace engines and other high-temperature and high-pressure scenes. Compared with a traditional method, the technology improves the yield, shortens the production period, reduces the labor intensity, is suitable for large-scale production, reduces surface air suction, oxidation and burning loss, and improves the production efficiency and the finished product quality.

The present application relates to the technical field of tungsten alloy materials, and in particular to a tungsten alloy wire, a preparation method therefor, and a use thereof in cutting of a semiconductor material. The tungsten alloy is composed of the following elements in percentage by mass: 0.4-1.1 wt% of L, 0.001-0.25 wt% of Z, and the balance of tungsten and inevitable impurities, wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium, and Z comprises oxygen and carbon. The wire diameter of the wire is 20-60 μm, the wire contains linear L or a compound of L along the wire axis direction, and the radial average width D of L or the compound of L is smaller than or equal to 5 nm. According to the present application, the linear L element is doped between tungsten base bodies, and the radial average width of L is controlled to be smaller than or equal to 5 nm, so that the wire has the tensile strength of 5000 MPa or above under the wire diameter of 20-60 μm, and the machining performance of the tungsten alloy wire is enhanced.

The invention provides a preparation method of niobium-tungsten alloy spherical powder. The preparation method comprises the following steps: S1, proportioning and mixing: mixing raw material powder such as niobium powder, tungsten powder, molybdenum powder and zirconium carbide powder into mixed powder according to a proportioning table; s2, pressing and sintering, wherein the mixed powder is pressed into blocks in a mold through pressing equipment, and then the blocks are sintered into blanks in a vacuum state; s3, pulverizing and screening: pulverizing and screening the blank to obtain non-spherical powder with a proper particle size range; and S4, spheroidizing: spheroidizing the non-spherical powder to obtain spherical powder. According to the niobium-tungsten alloy spherical powder prepared through the method, the particle size range of the powder is 15-60 microns, the powder spheroidization rate is larger than or equal to 90%, the powder oxygen content is smaller than or equal to 150 ppm, and the Hall flowability is larger than or equal to 8.0 s / 50 g; the powder prepared by the process is low in oxygen content, appropriate in powder size distribution range and high in fine powder yield, the process flow is short, and a production line is convenient to build.

The present invention relates to the technical field of tungsten alloy materials, and in particular to a tungsten alloy wire, and a preparation method therefor and a use thereof. The tungsten alloy is composed of the following elements in percentage by mass: 0.45-0.9 wt% of L, 0.05-0.2 wt% of oxygen, and the balance being tungsten and inevitable impurities, wherein L is one or more of lanthanum, cerium, praseodymium, neodymium, gadolinium, and samarium, the wire has a wire diameter of 20-60 μm, in the wire, L or compounds of L exist in the axial direction of the wire in a linear shape, and the average width D of L or the compounds of L in the radial direction is less than or equal to 5 nm. The element L is controlled to be doped between the tungsten base materials in a linear shape, and the average width D of L in the radial direction to be less than or equal to 5 nm, so that cracks and wire breakage caused by second-phase particles in the subsequent pressure machining process are greatly reduced, thereby guaranteeing the mechanical strength of the tungsten alloy wire, and thus the wire has a tensile strength of 5000 MPa or above under a wire diameter of 20-60 μm, and the machining performance of the tungsten alloy wire is enhanced.

The invention provides a tantalum-tungsten alloy hot forging machining method. The method comprises the following steps that a tantalum-tungsten alloy prefabricated part is subjected to heat preservation and then subjected to hot forging machining; the tantalum-tungsten alloy prefabricated part comprises a tantalum-tungsten alloy inner core, glass powder and a metal sheath layer from inside to outside; the heat preservation temperature ranges from 900 DEG C to 1400 DEG C. According to the method, heat preservation and hot forging are conducted after the tantalum-tungsten alloy prefabricated part is formed, and in the heat preservation process, the glass powder and the metal wrapping layer effectively prevent oxygen from invading; the glass powder can automatically fall off in the hot forging process, so that the steps of hot forging processing are simplified; through the treatment, oxidation of the large-size tantalum-tungsten alloy in the heating process is prevented, and the boundary dimension and the surface effect of the blank subjected to hot forging have good controllability.

The invention relates to the technical field of anti-oxidation coatings, and particularly discloses a tantalum-tungsten alloy anti-oxidation coating and a preparation process thereof. The tantalum-tungsten alloy anti-oxidation coating comprises a transition layer, an inner layer, a barrier layer and an outer layer which are stacked in sequence, the transition layer is prepared from the following raw materials: an Ir target, a Ta target and an Re target are adopted for co-sputtering; the inner layer is prepared from the following raw materials in parts by mass: Si, MoSi2, Y and Ta-W alloy powder; the barrier layer is prepared from the following raw materials in parts by mass: Al2O3, Yb2O3 and 3YZrO2; the outer layer is prepared from the following raw materials in parts by mass: a compound: Yb2O3, La2O3, Gd2O3, SiC and B4C; and the multi-element borides comprise ZrB2 and HfB2. The tantalum-tungsten alloy anti-oxidation coating prepared in the invention has relatively good high-temperature oxidation resistance.

The invention discloses a low-cost tantalum-tungsten alloy powder preparation method which comprises the following steps: degassing treatment: uniformly mixing superfine tantalum powder and tungsten powder according to a required ratio to obtain mixed powder, putting the obtained mixed powder into degassing equipment, vacuumizing and heating to volatilize gas impurities in the mixed powder and discharging the gas impurities; and isostatic pressing forming is conducted, specifically, the powder obtained after degassing treatment is loaded into a rubber mold sheath, isostatic pressing forming is conducted in a high-pressure environment, the powder is densified, and an obtained formed blank is put into a vacuum sintering furnace to be sintered. According to the method, an effective way for manufacturing low-cost, low-oxygen and low-carbon alloy powder is provided for the refractory metal spherical powder for additive manufacturing, low-grade, high-oxygen and unqualified tantalum-tungsten alloy fine powder waste can be recycled and formed, and the tantalum-tungsten alloy spherical powder reaching or exceeding the industrial standard is produced; the powder preparation production cost is greatly reduced, time and labor are saved, and the working efficiency is improved.

The invention provides an extrusion processing method of a niobium-tungsten alloy cast ingot and a niobium-tungsten alloy extrusion processing product, the extrusion processing method comprises the following steps: carrying out stepped heating on the niobium-tungsten alloy cast ingot with an anti-oxidation coating by using a medium-frequency induction furnace to obtain a blank to be extruded, the lowest holding temperature of the stepped heating is 800 DEG C + / -20 DEG C, the highest holding temperature is 1200 DEG C-1300 DEG C, and the total duration of the stepped heating is 30 min-45 min; and the blank to be extruded is subjected to non-sheath extrusion machining in the extrusion cylinder, and the niobium-tungsten alloy extrusion machining product is obtained. The non-sheath extrusion processing method provided by the invention has the advantages that the production period is shortened, the production loss is reduced, and the surface quality, the straightness and the processing plasticity of an extrusion processing product are improved.

The invention discloses a tantalum-tungsten alloy surface layer thickness ratio gradient structure coating and a preparation method thereof, and belongs to the technical field of ultrahigh-temperature anti-oxidation coating preparation. A tantalum-tungsten alloy is used as a substrate, and the surface coating of the tantalum-tungsten alloy is prepared through the following steps: (1) solid-phase embedding boronizing; (2) a ZrB2-MoSi2-ZrSi2 layer is prepared through the combination of slurry fusion sintering and a solid infiltration method; and (3) the ZrB2-TaSi2-Zr6Ta2O17 composite coating slurry is prepared in a sintering mode. The total thickness of the prepared coating ranges from 120 micrometers to 200 micrometers, the thicknesses of all the layers are in an exponential gradient relation: tn = t1 * Kn-1 (t0 = 1, K = 1.2-1.3), the problems of uneven thermal stress distribution between the tantalum-tungsten alloy substrate and the coating and between the layers of the coating and ultra-high-temperature anti-oxidation protection of the tantalum-tungsten alloy are successfully solved, the prepared coating is good in binding force and free of defects such as holes and cracks, and the service life of the coating is prolonged. And the tantalum-tungsten alloy can keep a good anti-oxidation effect for a short time under the extreme high-temperature condition of 2000 DEG C.

The invention discloses a high-wear-resistance tungsten carbide alloy and a preparation method thereof, and belongs to the technical field of tungsten carbide alloys. According to the high-wear-resistance tungsten carbide alloy, spherical hard particles are evenly distributed in a matrix, the mass percent of the hard particles is 80 wt.%-90 wt.%, and the mass percent of the matrix is 10 wt.%-20 wt.%; the hard particles comprise the following components in percentage by mass: 75 to 80 weight percent of composite tungsten carbide particles, 5 to 10 weight percent of cobalt powder, 2 to 3 weight percent of titanium powder, 2 to 3 weight percent of zirconium powder, 0.5 to 1 weight percent of rare earth oxide and 5 to 10 weight percent of nano carbon black. By adopting the wear-resistant tungsten carbide alloy and the preparation method thereof, the problem that the wear resistance of the tungsten carbide alloy is affected due to the fact that the hardness and the toughness of the existing tungsten carbide alloy cannot be synergistically enhanced can be solved.

The invention provides a nickel-tungsten alloy electroplating solution, a preparation method thereof and a preparation method of a solar cell metal electrode, and particularly relates to the technical field of solar cell preparation. The nickel-tungsten alloy electroplating solution provided by the invention comprises nickel salt, tungstate, a complexing agent, a wetting agent and water. In the nickel-tungsten alloy electroplating solution provided by the invention, on the basis of nickel salt and tungstate, a uniform and compact nickel-tungsten alloy layer can be formed on the surface of a plated part, and the layer of alloy combines the electrical conductivity of nickel and the corrosion resistance and high hardness characteristics of tungsten, so that the comprehensive performance of the plated part is remarkably improved. And the complexing agent is added, so that the activity of nickel ions and tungsten ions and the electrodeposition process are effectively controlled, and the quality and the production efficiency of a plating layer are optimized. And the wetting agent is used, so that the wettability of the plating solution on the surface of a plating piece is improved, uniform deposition of an alloy layer is promoted, pores and defects are reduced, and the binding force and durability of a plating layer are enhanced.

The invention discloses a low-cost tantalum-tungsten alloy powder preparation method which comprises the following steps: degassing treatment: uniformly mixing superfine tantalum powder and tungsten powder according to a required ratio to obtain mixed powder, putting the obtained mixed powder into degassing equipment, vacuumizing and heating to volatilize gas impurities in the mixed powder and discharging the gas impurities; and isostatic pressing forming is conducted, specifically, the powder obtained after degassing treatment is loaded into a rubber mold sheath, isostatic pressing forming is conducted in a high-pressure environment, the powder is densified, and an obtained formed blank is put into a vacuum sintering furnace to be sintered. According to the method, an effective way for manufacturing low-cost, low-oxygen and low-carbon alloy powder is provided for the refractory metal spherical powder for additive manufacturing, low-grade, high-oxygen and unqualified tantalum-tungsten alloy fine powder waste can be recycled and formed, and the tantalum-tungsten alloy spherical powder reaching or exceeding the industrial standard is produced; the powder preparation production cost is greatly reduced, time and labor are saved, and the working efficiency is improved.

The invention discloses a niobium-titanium-tungsten alloy based on 3D printing, a gradient material of the niobium-titanium-tungsten alloy and a preparation method of the niobium-titanium-tungsten alloy. Mixed powder is used as a raw material, and short-process and low-cost preparation of the niobium-titanium-tungsten alloy can be achieved through multiple additive manufacturing methods. By utilizing the ratio of the pre-alloyed powder with different impurity contents, the performance of the niobium-titanium-tungsten alloy can be effectively regulated and controlled through various additive manufacturing methods; a niobium-titanium alloy coating is cladded on the surface of the niobium-titanium-tungsten alloy to form a gradient material, and the corrosion resistance of the niobium-titanium-tungsten alloy can be improved on the premise that the performance of a niobium-titanium-tungsten matrix is not obviously changed.

The invention relates to an integrated machining method for a niobium-tungsten alloy composite surface variable-wall-thickness thin-wall part, and belongs to the field of metal plate forming. Determining the size of a niobium-tungsten alloy plate according to the size of the composite surface; groove milling is conducted on the spinning clamping position of the niobium-tungsten alloy plate; the machined plate is arranged on a spinning tire, and a tail top is used for clamping and fixing; the variable wall thickness forming of the curved generatrix part is realized by adopting strong shearing spinning and common spinning deep drawing spinning; the equal-wall-thickness forming of the cylindrical part is realized by adopting multi-pass deep drawing and spinning; the tiny allowance of the outer wall is removed through precise turning cutting, and it is guaranteed that the wall thickness meets the product use requirement; polishing the inner and outer surfaces to reduce the surface roughness; the niobium-tungsten alloy plate is used for forming, the material utilization rate is increased, split connection weld joints are reduced through a highly-integrated forming method, and the structural reliability is improved.

The invention relates to an ultrafine high-strength multi-component composite reinforced tungsten filament and a preparation method thereof, the tungsten filament comprises W, rare earth oxide (any one of La2O3, Y2O3 and CeO2) and alloy elements (Al, Si, K and Zr), the content of the rare earth oxide in the tungsten filament is 0.1-1.0 wt%, and the content of Al in the alloy elements is 0.025-0.05 wt%, the content of Si is 0.1-0.2 wt%, the content of K is 0.28-0.56 wt%, the content of Zr is 0.1-0.5 wt%, and the balance is W. The wire diameter of the tungsten filament is 28-30 [mu] m; the tensile strength of the tungsten filament is more than 7100 MPa, and the length of a single tungsten filament is more than 150 thousand meters. According to the tungsten wire, through multi-phase composite doping, the purpose of synergistic strengthening such as nano-particle dispersion strengthening, fine grain strengthening and grain boundary strengthening is achieved, and the superfine high-strength tungsten alloy wire with good toughness can be obtained.

The invention discloses a tungsten alloy wire which is composed of a tungsten alloy bus and a self-lubricating composite coating, and the self-lubricating composite coating sequentially comprises a pre-coating and a composite coating from inside to outside. The method has the beneficial effects that on one hand, the tungsten alloy bus is subjected to etching treatment through concentrated hydrochloric acid or hydrofluoric acid, and meanwhile, the pre-plating layer is added, so that the binding force between the electroplated layer and the tungsten alloy wire is enhanced; meanwhile, the lubricating composite coating is prepared by adding solid lubricating particles into the electroplating liquid for composite electroplating, so that the die loss in the drawing process is effectively reduced, and the cost is saved; and on the other hand, a nickel aminosulfonate pre-plating process is changed, and impact nickel is used as a pre-plating bottom layer of the diamond wire, so that the binding force of the grinding composite coating and the diamond wire bus is improved, and the problems of wire breakage or silicon wafer scratching and the like caused by falling of the grinding composite coating in the cutting process of the diamond wire can be prevented.

The invention relates to a high-strength tungsten alloy ultra-fine wire drawing device, comprising a traction structure and a drawing structure, wherein the traction structure comprises an inner winding piston, an outer electromagnetic coil, a linear guide rail and a clamp; the drawing structure comprises a clamping jaw, an electromagnetic valve and an eye mold; the inner winding piston and the outer electromagnetic coil are both sleeved on the linear guide rail, and the outer electromagnetic coil is sleeved on the outside of the inner winding piston, and the outer electromagnetic coil is fixed on the linear guide rail through a clamp, and the inner winding piston is provided with an inner electromagnetic coil; the eye mold is arranged on one side of the linear guide rail, the clamping jaw is fixedly installed on the inner winding piston, and the clamping jaw is connected to the electromagnetic valve, the tungsten wire is fixedly clamped by the clamping jaw after passing through the eye mold, and the opening and closing of the clamping jaw is controlled by the electromagnetic valve. The purpose of the invention is to provide a high-strength tungsten alloy ultra-fine wire drawing device, aiming at the existing technology of online heating tower wheel type slip differential drawing, and solving the defect caused by the sliding friction between the tower wheel and the metal filament in the tower wheel type slip differential drawing.

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.

The invention relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire, a preparation method thereof and application of the tungsten alloy wire in semiconductor material cutting, and tungsten alloy is composed of the following elements of, by mass, 0.4-1.1 wt% of L, 0.001-0.25 wt% of Z and the balance tungsten and inevitable impurities. Wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; z comprises oxygen and boron; the wire rod has a wire diameter of 20-60 [mu] m, the wire rod has a linear L or L compound in the axial direction, and the radial average width D of the L or L compound is less than or equal to 5 nm. The linear element L is doped between the tungsten matrixes, and the radial average width of the element L is controlled to be smaller than or equal to 5 nm, so that the wire has the tensile strength of 5000 MPa or above under the wire diameter of 20-60 microns, and the machining performance of the tungsten alloy wire is enhanced.

The medium-temperature radial forging method comprises the steps that pretreatment is conducted, specifically, a niobium-tungsten alloy extrusion bar blank is heated for 60-180 minutes at the temperature of 750-950 DEG C, rapid forging and straightening are conducted, and a medium-temperature radial forging bar blank is obtained and annealed for 60-120 minutes at the temperature of 1250-1450 DEG C; medium-temperature radial forging is conducted, specifically, a two-step method is adopted, in the first step, a bar blank is preheated to 80-100 DEG C and coated with Ta1350 high-temperature glass powder, heat preservation is conducted for 90-180 minutes at the temperature of 1050-1150 DEG C, and the bar blank is forged into a bar with the diameter of 70 + / -1 mm in the mode that the diameter is reduced by 7-10 mm every time; and in the second step, the heating and coating processes are repeated, the diameter is reduced by 5-7 mm every time, and the bar with the required specification is manufactured. By optimizing the medium-temperature forging and annealing process, the fine grain structure is controlled, the high-temperature mechanical property, creep resistance and oxidation resistance of the material are improved, and the material is suitable for aerospace engines and other high-temperature and high-pressure scenes. Compared with a traditional method, the technology improves the yield, shortens the production period, reduces the labor intensity, is suitable for large-scale production, reduces surface air suction, oxidation and burning loss, and improves the production efficiency and the finished product quality.

The invention discloses a tungsten alloy wire and a product and a preparation method thereof, the tungsten alloy wire is composed of a tungsten alloy bus and a self-lubricating composite coating, and the self-lubricating composite coating sequentially comprises a pre-coating and a composite coating from inside to outside. On one hand, the tungsten alloy bus is etched through hydrofluoric acid, and meanwhile, the pre-plating bottom layer is added, so that the binding force between the electroplated layer and the tungsten alloy bus is enhanced. Meanwhile, the lubricating composite coating is prepared by adding solid lubricating particles into the electroplating liquid for composite electroplating, so that the die loss in the drawing process is effectively reduced, and the cost is saved; and on the other hand, a nickel aminosulfonate pre-plating process is changed, and impact nickel is used as a pre-plating bottom layer of the diamond wire, so that the binding force of the grinding composite coating and the diamond wire bus is improved, and the problems of wire breakage or silicon wafer scratching and the like caused by falling of the grinding composite coating in the cutting process of the diamond wire can be prevented.

The invention relates to the field of preparation of composite materials, in particular to a preparation method of a high-strength, high-energy-absorption and high-impact-resistance copper-tungsten composite material, which is suitable for preparing a copper-tungsten composite material with a three-dimensional interpenetrating characteristic. The method comprises the following steps: preparing a tungsten or tungsten alloy porous material; carrying out hot isostatic pressing sintering on the tungsten or tungsten alloy porous material and copper powder to prepare a copper-tungsten composite material; the composite material is formed by compositing a tungsten or tungsten alloy porous material with the porosity of 50-95% printed through an additive manufacturing technology and copper, and all composition phases are kept in respective communication and interspersed in a three-dimensional space. When the temperature is 20-500 DEG C, the compressive strength of the composite material reaches 678MPa, the absorption energy reaches 196MJ / m < 3 >, and the absorption energy is improved by more than 200% compared with that of tungsten and tungsten alloy frameworks. The method is simple in process step and low in production cost, and has good application prospects in the fields of national defense, aerospace, automobiles, energy and the like.

The invention provides an improved tungsten alloy sintering process which comprises the following steps: (1) weighing the following components in parts by mass: 92-95 parts of W, 4-8 parts of Ni, 3-6 parts of Fe, 1.2-1.6 parts of Cr, 0.3-0.8 part of Co and 1.4-1.9 parts of modified lanthanum trioxide; (2) mixing the components in the step (1), and carrying out ultrasonic dispersion treatment in a treatment modification liquid; (3) washing with water, drying, and performing cold isostatic pressing to obtain a blank; (4) feeding the blank into a sintering furnace for sintering, and cooling for later use after sintering is finished; (5) the temperature is increased to 550-650 DEG C, rotary forging machining is conducted, then the temperature is reduced to 300-350 DEG C, and heat preservation is conducted for 10-20 min; and water-cooling to room temperature, and drying to obtain the tungsten alloy. The tungsten alloy is excellent in comprehensive performance and has wide market prospects.