472 results about "Tungsten alloy" patented technology

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 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 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 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 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 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 discloses a 10KV sulfur hexafluoride switch cabinet which comprises a cabinet body, a gas box is arranged in the cabinet body, a mechanism chamber is arranged on the gas box, an electric control chamber is arranged on the mechanism chamber, an operating mechanism is arranged in the mechanism chamber, a three-phase high-voltage switch assembly is arranged in the gas box, and the three-phase high-voltage switch assembly is connected with the operating mechanism. A wire inlet sleeve and a wire outlet sleeve which are matched with each phase of high-voltage switch assembly are arranged on the gas box, the wire inlet sleeve is arranged on the gas box in an inverted mode, a first cylindrical contact is fixedly arranged in the wire inlet sleeve in a sleeved mode, copper-tungsten alloy of a spiral structure is embedded in the inner circumferential wall of the first cylindrical contact, a copper wire inlet rod is vertically inserted in the first cylindrical contact, and a wire outlet rod is arranged on the wire inlet sleeve. A heat dissipation box is arranged at the upper end of the gas box, a pressure relief device is arranged at the upper end of the heat dissipation box, the heat dissipation box and the gas box are internally communicated to form a closed cavity, the closed cavity is filled with sulfur hexafluoride gas, an inflation and measurement integrated pressure gauge is mounted on the gas box, and heat dissipation fins are paved on the outer surfaces of the gas box and the heat dissipation box. The heating value can be reduced, efficient heat dissipation is achieved, and the reliability of the switch cabinet is improved.

The invention provides a graphene reinforced copper-tungsten alloy material, a preparation method, an electrical contact and application. The preparation method comprises the steps that raw materials are prepared, specifically, tungsten powder, first graphene powder and first copper powder are weighed to prepare a plurality of grades of tungsten framework mixtures according to different proportions, and copper paste prepared by mixing second copper powder and second graphene powder according to a set proportion is weighed; molding and compounding treatment: sequentially loading the tungsten skeleton mixtures of multiple grades into a mold, carrying out layered cold pressing to obtain a preformed blank, and carrying out hot-pressing compounding treatment on the preformed blank in a protective atmosphere to obtain a tungsten skeleton pressed blank; infiltrating treatment: injecting copper slurry into the tungsten skeleton pressed blank, and carrying out vacuum infiltrating to obtain an infiltrated alloy body; and densification treatment is conducted, specifically, the infiltrated alloy body is placed in the protective atmosphere to be subjected to hot pressing treatment, and the graphene reinforced copper-tungsten alloy material is obtained. The mechanical property, the conductivity, the frictional wear resistance and the arc ablation resistance of the tungsten alloy material are synergistically improved, so that the material has excellent comprehensive performance.

The invention belongs to the technical field of tungsten alloy, and particularly discloses a tungsten alloy electrode material and a preparation method thereof.The tungsten alloy electrode material comprises, by weight, 0.1%-0.2% of lanthanum boride, 0.2%-0.5% of zirconium oxide, 0.2%-0.6% of boron carbide, 0.4%-0.8% of cerium oxide, 0.5%-1.2% of tantalum carbide, 1.4%-1.8% of modified carbon nanotubes and the balance tungsten powder. The lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes are added into the tungsten powder, under the combined action of the lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes, the tensile strength and the electrical conductivity are effectively improved, and the high-temperature stability tungsten powder has excellent high-temperature stability and wide application prospects.

The invention relates to the technical field of tantalum-tungsten alloy surface treatment, in particular to a tantalum-tungsten alloy material with a tantalum carbide infiltrated layer and a preparation method of the tantalum-tungsten alloy material. The tantalum-tungsten alloy material with the tantalum carbide infiltrated layer is prepared through a pulse carburizing method, the tantalum carbide infiltrated layer of the product is combined to the surface of a tantalum-tungsten alloy matrix and comprises a TaC phase and a Ta2C phase, a first infiltrated layer with the Ta2C phase as the main part and the TaC phase as the auxiliary part and a second infiltrated layer with the TaC phase as the main part and the Ta2C phase as the auxiliary part are sequentially arranged on the surface of the matrix, the side, making contact with the matrix, of the first infiltrated layer is in a spine shape, and the other side, making contact with the matrix, of the second infiltrated layer is in a spine shape. The total volume of the TaC phase accounts for 66%-75% of the volume of the infiltrated layer, and the Ta2C phase accounts for 25%-34% of the volume of the infiltrated layer. Through reasonable design and control of components of the infiltrated layer, the wear resistance and hardness of the carbide infiltrated layer are effectively improved, the surface hardness of the carbide infiltrated layer can reach 15 GPa to 45 GPa, and the corrosion rate in high-temperature molten metal cerium is 0.01000 mu m / h to 0.05500 mu m / h.

The present invention discloses a method for preparing a black decorative film for application on plastics, comprising electroplating, cleaning, baking, glow cleaning, and physical vapor deposition (PVD) steps. The PVD process deposits a chromium-tungsten alloy layer on a plastic substrate using medium-frequency magnetron sputtering. Acetylene reaction gas is then introduced and doped with the carbon element in the acetylene reaction gas using medium-frequency magnetron sputtering, thereby forming a CrWC black film. The present invention utilizes a novel alloy target material and medium-frequency magnetron sputtering to deposit the CrWC film on the surface of the plastic substrate. This method eliminates the need for workpiece heating and utilizes a staged sputtering process to deposit the alloy target, resulting in a more stable black decorative film.

The invention provides a high-temperature-resistant creep-resistant tungsten alloy, and relates to the technical field of powder metallurgy, the tungsten alloy comprises, by mass, 3-8 wt% of Re, 0.2-1 wt% of carbide, 0.1-0.5 wt% of boride, and the balance tungsten and inevitable impurities; the carbide is selected from one or more of TiC, ZrC, TaC and HfC; the boride is selected from one or more of TiB2 (titanium diboride), HfB2 (hafnium diboride) and ZrB2 (zirconium diboride). The high-temperature-resistant creep-resistant tungsten alloy is prepared by adding low-content rhenium, carbide and boride into pure tungsten and adopting a unique preparation method, and the technical defects that an existing tungsten-rhenium alloy is insufficient in strength and creep resistance at the ultrahigh temperature (larger than or equal to 2000 DEG C), and a traditional multi-pass processing technology is complex are overcome.

The utility model relates to an X-ray tube anode target disc fixing structure which comprises a rotor, and an anode target disc, a fixing nut, an anti-loose gasket and a locking cover are sequentially installed on the rotor. The locking cover tightly presses the anti-loose gasket, so that the anti-loose gasket generates elastic deformation between the fixing nut and the locking cover; the anti-loose gasket is a wave-shaped gasket; an anti-rotation structure is arranged between the rotor and the anode target disc, the anti-loose gasket is provided with 4-6 waveforms and is made of molybdenum alloy or tungsten alloy, and the rotor is in clearance fit with the anode target disc. The utility model has the advantages of high reliability, long service life and low assembly requirement, eliminates the gas retention risk of the internal closed cavity, and realizes the directional dredging of the gas by establishing a communication channel between the cavity and the external high vacuum environment.

The invention provides an ultrathin-wall niobium-tungsten alloy and titanium alloy dissimilar metal electron beam welding method which comprises the following steps: step 1, cleaning the to-be-welded parts of niobium-tungsten alloy and titanium alloy by using absolute ethyl alcohol, and then drying; step 2, assembling; the niobium-tungsten alloy and the titanium alloy part are in butt joint and fixed; 3, vacuum electron beam welding is used for positioned welding; and 4, formal welding is conducted. After welding, the surface of a welding seam is formed well, good metallurgical fusion is achieved, and the welding seam welded through a vacuum electron beam meets the QJ 20622-2016 I-level standard; under the room temperature condition, the tensile strength of the welding seam reaches 80% of that of titanium alloy base metal; a hydraulic strength test is carried out on a welding seam, and the welding seam is free of leakage and deformation when the pressure is maintained for 5 minutes under 4.1 MPa. An airtight test is carried out on a welding seam, the requirement that air leakage is avoided under the pressure of 3 MPa for 5 min is met, and the design structure size is promoted to continuously break through in the miniaturization and precision direction.

The invention discloses an electrode assembly for a high-power pulse xenon lamp and a preparation method of the electrode assembly, and aims to overcome the technical defects that a traditional electrode is large in mass and poor in reliability and stability. The electrode assembly is mainly composed of an electrode tip, an electrode stem and a lead seat which are made of cerium-tungsten alloy, niobium and stainless steel. The electrode tip and the electrode rod are stably connected in a mode of combining brazing with interference connection, and the electrode rod and the lead seat adopt a multi-connection structure of brazing, threaded mechanical connection and micro interference connection; the assembled electrode assembly is subjected to degassing, brazing connection and electrode activation treatment at a time in a high-temperature and high-vacuum environment, and the problem of electrode material pollution caused by repeated heating is effectively avoided. The electrode assembly is simple in overall structure, reliable in preparation, excellent in current passing ability, capable of bearing impact force under extreme working conditions and outstanding in burning loss resistance, reliability and stability are remarkably improved, and the long-term stable working requirement and large-scale mass production of the high-power pulse xenon lamp are met.

The invention provides a niobium-tungsten alloy and a preparation method thereof. The preparation method comprises the following steps: 1) performing vacuum reduction sintering on a powder blank comprising niobium powder, first tungsten powder, first molybdenum powder and yttrium powder to obtain a niobium-tungsten-molybdenum alloy strip; (2) carrying out aluminothermic reaction on powder comprising niobium oxide, aluminum powder, second tungsten powder and second molybdenum powder to obtain a niobium-tungsten-molybdenum-aluminum alloy block; (3) the niobium-tungsten-molybdenum-aluminum alloy block is subjected to vacuum electron beam melting, and a niobium-tungsten-molybdenum alloy plate is obtained; 4) forming a smelting electrode by using the zirconium sheet niobium-tungsten-molybdenum alloy strip, the niobium-tungsten-molybdenum alloy plate and the niobium wire; and (5) the smelting electrode is subjected to vacuum electron beam smelting, and the niobium-tungsten alloy is obtained and comprises, by mass, 4.5%-5.5% of tungsten, 1.5%-2.5% of molybdenum, 1.4%-2.2% of zirconium, smaller than or equal to 0.08% of yttrium, 0.002%-0.02% of carbon, smaller than or equal to 0.2% of tantalum, smaller than or equal to 0.023% of oxygen, smaller than or equal to 0.015% of nitrogen, smaller than or equal to 0.002% of hydrogen and the balance niobium and inevitable impurities, and the inevitable impurities must contain yttrium.

The invention belongs to the field of tungsten alloys, and particularly relates to an energetic tungsten alloy and a preparation method thereof.The energetic tungsten alloy comprises a tungsten phase formed by tungsten and a solid solution phase formed by active metal; the mass content of the tungsten phase is not less than 75%; the active elements comprise zirconium, titanium and niobium. The tungsten content in the energetic tungsten heavy alloy manufactured in combination with laser additive manufacturing exceeds 75 wt%, on the premise that the tungsten content reaches up to 85 wt%, excellent compactness and excellent mechanical performance can still be guaranteed, the process is simple, and the production efficiency is high.

The application discloses a catalyst for preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate and a preparation method thereof. The catalyst comprises an active component, an auxiliary component and a carrier. The active component is a single substance or an oxide of Cu, the auxiliary component is a single substance or an oxide of W, the high active site is a Cu-W alloy interface and single Cu and W metals, and the carrier is one or more than two of silicon dioxide, aluminum oxide, zirconium oxide, zinc oxide, magnesium oxide and cerium oxide. The copper-tungsten alloy catalyst provided by the application has the advantages of structural stability, high mechanical strength, good heat conduction performance, high substrate conversion rate and high product selectivity. The preparation method is simple in steps, easy in raw material acquisition, low in cost, green in pollution, good in preparation repeatability and easy in scale production. The catalyst has extremely high stability and catalytic activity in the reaction of preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate, high ethanol or methyl acetate yield and high active component utilization rate.

The invention discloses a high-temperature-resistant passive strain gauge for gas turbine blade monitoring and a preparation method and application thereof, and belongs to the technical field of gas turbine health monitoring. The high-temperature-resistant passive strain gauge comprises a strain gauge substrate, an insulating layer, a snakelike sensitive grid, a fiber bragg grating (FBG) and a yttria-stabilized zirconia (YSZ) protective layer. The strain gauge has the beneficial effects that aiming at the limitation of a traditional sensor in a high-temperature (greater than or equal to 1200 DEG C), high-frequency vibration and corrosion environment, the strain gauge adopts the high-temperature-resistant platinum-tungsten alloy snakelike sensitive grid, the single crystal aluminum oxide ceramic substrate and the sapphire fiber bragg grating to transmit a strain signal through wavelength shift, and an external power supply is not needed; and the Ir-Re alloy is brazed and fixed to the microgroove in the surface of the blade, the shearing strength is high, and the service life is long. The method overcomes the technical bottleneck of strain measurement in a high-temperature environment, is suitable for scenes of aero-engines, gas turbine blades and the like, and remarkably reduces the maintenance cost and improves the monitoring reliability.

The invention relates to the technical field of electroplating, and particularly discloses a high-resistance sulfur-tungsten alloy electroplating corrosion prevention process which comprises the following steps: adding nano aluminum oxide into an ethanol solution, then adding a silane coupling agent, and performing ultrasonic treatment to obtain sol; and under the protection of inert gas, aerosol formed by ultrasonic atomization of the sol, methane and a nano-silica coated nickel-tungsten alloy coating are subjected to a carbon thermal reduction reaction to obtain a product, and the product is cooled to obtain the high-sulfur-resistance tungsten alloy electroplated coating. According to the method, after the nano silicon dioxide is synthesized on the surface of the nickel-tungsten alloy in situ, the nano aluminum oxide is introduced in the carbon thermal reduction process, and the interface bonding force of the silicon carbide and the nickel-tungsten alloy coating is improved.

The application provides a molybdenum-tungsten alloy composite rotary target repairing method, which comprises six steps of target disc defect inspection, mechanical treatment, preliminary filling, electron beam cladding, stress relief annealing and post-treatment. The molybdenum-tungsten alloy composite rotary target repairing method of the application analyzes the information such as defect type, form, size, material composition and content of the waste molybdenum-tungsten composite rotary target disc or the molybdenum-tungsten composite rotary target with defects in the production process, adopts different filling methods, performs local cladding through an electron beam, and finally obtains the repaired molybdenum-tungsten alloy composite rotary target. The molybdenum-tungsten alloy composite rotary target repaired by the method has high density and high strength of the combined part, and the quality is equivalent to that of the original product, which can fully meet the use requirements of the X-ray tube, and effectively realizes the reuse of the waste molybdenum-tungsten composite rotary target disc or the molybdenum-tungsten composite rotary target with defects in the production process.

The invention discloses a copper-tungsten alloy waste cleaning and recycling method based on hydrogen reduction, belongs to the technical field of non-ferrous metal waste cleaning metallurgy and resource circulation, and aims at solving the problems that a traditional recycling method is high in energy consumption, complex in process, heavy in secondary pollution, difficult to consider both the metal recycling rate and the metal purity, large in high-temperature operation safety risk and the like. According to the method, the tungsten-copper alloy waste is sequentially subjected to primary crushing, oxidation, primary reduction, separation, secondary reduction, screening, tertiary reduction, secondary crushing, airflow pulverization, acid pickling and impurity removal and other procedures, cooperative operation is carried out in cooperation with special equipment such as an oxidation reaction tank and a reduction reaction kettle, and meanwhile mixture separation and a hydrogen internal circulation system are integrated; efficient cleaning, separation and extraction of tungsten and copper are achieved, and the energy utilization and resource circulation level is improved. Tungsten and copper are separated thoroughly, the product purity is high, energy consumption is low, the metal recovery rate is high, no three wastes are discharged in the whole process, the green low-carbon circular economy concept is met, the recovery rate of the obtained tungsten powder and copper powder is larger than or equal to 99%, the oxygen content is smaller than 0.05 wt%, and the particle size uniformity is excellent.

The invention belongs to the technical field of nickel-tungsten alloy preparation, and particularly discloses a medium-density high-strength high-plasticity-toughness nickel-tungsten alloy bar and a preparation method thereof, and the preparation method comprises the steps of cast ingot preparation, high-temperature homogenization, cogging forging, intermediate forging, finished product forging and heat treatment. Firstly, a cast ingot is prepared through vacuum induction melting and vacuum consumable arc melting, after high-temperature homogenization, cogging forging adopts combination of a hard sheath and a soft sheath and upsetting deformation, intermediate forging reduces the temperature and adopts upsetting, edge surface alternation and octagonal deformation, and finished product forging is subjected to room-temperature cold deformation after solution treatment. And finally, Ni4W phase precipitation is promoted through aging heat treatment. The prepared nickel-tungsten alloy bar has the density of 10.9 g / cm < 3 >-11.6 g / cm < 3 > and the tensile strength of 1600 MPa, has the characteristics of uniform structure, fine grains, medium density, high strength and high plasticity and toughness, and is suitable for the fields of industrial manufacturing, mechanical engineering and the like.

The invention belongs to the technical field of tungsten alloys, and particularly discloses a tungsten alloy catalyst and a preparation method thereof.The preparation method comprises the steps that tungsten powder, iron powder, cobalt powder, manganese powder, yttrium oxide powder and titanium oxide powder serve as raw materials, graphene serves as an activating agent, the raw materials are blended, then special pore forming of ammonium bicarbonate and rubidium hydroxide and corrosion of nitric acid are conducted, and the tungsten alloy catalyst is obtained. The tungsten alloy catalyst with excellent catalytic activity is obtained by coating a tin compound (changed into tin oxide through heat treatment), finally carrying out three times of heat treatment, eliminating internal stress in the alloy through the first time of heat treatment, inducing generation of metastable intermetallic compounds through the second time of heat treatment and finally carrying out high-temperature sintering, and the tungsten alloy catalyst can be used for catalytic hydrogen production.

A tungsten alloy wire is to be used in an environment in which the tungsten alloy wire at least once undergoes a thermal effect at a temperature of at least 1100 degrees Celsius. The tungsten alloy wire includes rhenium with a content of at least 5 wt % and at most 26 wt %.

A cooling device includes a tungsten alloy cooling pad (10), a first substrate (20), a second substrate (30) and multiple connecting columns (40). The tungsten alloy cooling pad (10) is used for being attached on the heat source (H). The first substrate (20) is parallelly superposed on the tungsten alloy cooling pad (10). The second substrate (30) corresponds to the first substrate (20) to be parallelly arranged. Each connecting column (40) is perpendicularly connected between the first substrate (20) and the second substrate (30). Each connecting column (40) is arranged in a matrix. Accordingly, the tungsten alloy cooling pad (10) can rapidly disperse and transfer the heat of the heat source (H) to the first substrate (20) and transfer to the second substrate (30) through each connecting column (40) for cooling to avoid heat accumulation leading to overheat.

The present invention relates to a composite hydrogen filtration membrane with an amorphous nickel-tungsten alloy as an intermediate diffusion layer and a preparation method thereof. The composite hydrogen filtration membrane is composed of a porous alumina ceramic support, an amorphous nickel-tungsten layer, and a pure palladium layer. First, the porous ceramic support is pretreated, and its surface is sensitized and activated by a dilute hydrochloric acid solution of SnCl2 and PdCl2, and then a layer of pure palladium is plated by electroless plating. Then, an amorphous nickel-tungsten layer is obtained by electroplating, and finally, a pure palladium layer is electrolessly plated on the surface. The pure palladium layer provides the dissociation and desorption of hydrogen. On the one hand, the amorphous nickel-tungsten layer provides better strength and ductility, ensuring the long-term stable operation of the composite membrane. On the other hand, it replaces part of the palladium material with a material of lower price, reducing the manufacturing cost of the composite hydrogen filtration membrane. Since the tungsten element with a lower hydrogen retention amount is used as an alloying element and has a unique amorphous structure, the amorphous nickel-tungsten alloy layer prepared by the present invention is not prone to hydrogen embrittlement caused by the accumulation of hydrogen atoms during the diffusion process of hydrogen atoms.

The utility model relates to a kind of tungsten carbide alloy high-pressure forming device of molding equipment technical field, including extruder, and the extruder is equipped with forming head, the forming head is matched with cutter, the cutter is connected with telescopic link, the forming head is matched with material receiving subassembly, the material receiving subassembly includes support platform, moving platform and carrier plate, the carrier plate is placed on moving platform, the both ends of moving platform bottom are respectively fixedly connected with sliding block, matching slide groove is equipped on the support platform of the sliding block correspondence, screw rod is equipped in the slide groove, and one end of screw rod is connected with forward and reverse motor after penetrating slide groove, two the sliding block slidingly arranged in slide groove and with screw rod thread cooperation.The utility model is formed and cutting synchronous, reduces process, saves cost, and the continuity of forming operation is strong, and efficiency is high, the material after forming can be stably carried, reduces deformation, improves the effect of forming, is conducive to production.