504 results about "Titanium powder" patented technology

The invention relates to the technical field of catalysts, in particular to a carbon monoxide oxidation catalyst and a preparation method thereof. The catalyst is prepared by the method. The method comprises the following steps: adding a required amount of platinum salt and assistant salt into water for dissolving to obtain a mixed solution; dropwise adding the mixed solution into a required amount of tungsten-titanium powder, and stirring while dropwise adding until a muddy substance is obtained; adding a binder into the mud, uniformly stirring and mixing, and extruding to obtain an integral honeycomb mud blank; sequentially carrying out first drying treatment and first roasting treatment on the integral honeycomb mud blank to obtain an integral honeycomb carrier; placing the integral honeycomb carrier in a tetrabutyl titanate alcoholic solution for soaking treatment; and sequentially carrying out second drying treatment and second roasting treatment on the soaked integral honeycomb carrier to obtain the carbon monoxide oxidation catalyst. According to the invention, the carbon monoxide oxidation catalyst with high catalytic activity, strong toxicity resistance and good stability can be prepared.

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 relates to the technical field of optical coating materials, and particularly discloses a trititanium pentoxide optical coating material and a preparation process thereof. The invention relates to a preparation process of a trititanium pentoxide optical coating material, which comprises the following specific steps: mixing titanium dioxide and titanium powder by using a dry method, then carrying out hydraulic pressure, then carrying out vacuum sintering, cooling, then taking out trititanium pentoxide sintered crystals, then carrying out surface modification on the trititanium pentoxide sintered crystals and a titanate coupling agent, and finally carrying out vacuum sintering to obtain the trititanium pentoxide optical coating material. Drying and crushing to obtain a trititanium pentoxide finished product; and mixing the trititanium pentoxide finished product with silicon dioxide and aluminum oxide, and sintering to form the trititanium pentoxide optical coating material. Under the synergistic effect of all processes and raw materials, prepared trititanium pentoxide finished product particles are promoted to form a more compact sintered body, a uniform and stable interface is formed in the coating process, and the bonding strength and wear-resistant stability of the coating material are improved.

The invention discloses a deoxidizer for metal smelting and a preparation process thereof, and belongs to the technical field of steel for high-strength fasteners, and the deoxidizer comprises aluminum powder, silicon powder, titanium powder, zirconium powder and carbon-coated lanthanum nano powder in a mass ratio of (45-50): (20-25): (15-20): (8-12): (0.2-0.4). In a sol crystallization stage, lanthanum nitrate and a composite ligand form a directionally growing metal organic framework under the assistance of an external field, and a regular pore structure of the metal organic framework provides a nano-scale template for subsequent carbon coating, so that the decomposed organic ligand is gradually carbonized in a segmented heating process and forms a gradient structure; the low-temperature section promotes the carbon layer to be converted from an amorphous state to an ordered state so as to enhance the electron conduction capability, and the high-temperature section forms a through mesoporous network through external energy etching, so that excessive agglomeration of lanthanum nanoparticles is limited, and a controllable release channel is constructed. The preheating and pre-pressurizing process provides support for the nanostructure on the macroscopic scale, and the aluminum powder is softened through low-temperature plastic deformation to fill gaps of the titanium-zirconium powder, so that a compact initial blank structure is formed.

The invention discloses a preparation method of a steel pipe, which comprises the following steps: carrying out powdering treatment and surface modification on high-purity chromium powder, nickel powder, molybdenum powder, manganese powder, silicon powder, titanium powder, niobium powder, copper powder and iron powder according to a mass ratio, and uniformly mixing to obtain alloy powder; the alloy powder is subjected to compression molding and directional local strengthening, and a blank is obtained; carrying out sintering and multi-stage heat treatment on the green body to obtain a sinter; the sinter is subjected to multi-pass drawing and upsetting treatment, and a steel pipe is formed; straightening and rounding the steel pipe and polishing the inner and outer surfaces; the microstructure and performance of the alloy are optimized, defects and impurities in the alloy are reduced, and the uniformity and compactness of the alloy are improved, so that heat is transferred more effectively; stress concentration points and microdefects are reduced by changing the lattice structure and the chemical bond type in the alloy; compared with the prior art, excessive stress concentration of part of the prepared steel pipe is reduced, the uniformity of the alloy is improved, and the stress distribution of the steel pipe is more uniform.

The invention relates to the technical field of metal materials, and discloses a composite metal material based on micro-nano porous copper powder, which is composed of the following components: a matrix is micro-nano porous copper powder with the particle size of 50-500 nanometers, the porosity is 30-80%, and the pore diameter is 20-200 nanometers; the metal additive comprises 5-20 wt% of aluminum powder and 3-15 wt% of nickel powder; the functional additive comprises 1 to 8 weight percent of titanium powder, 0.5 to 5 weight percent of graphene and 0.3 to 3 weight percent of a carbon nano tube; a nickel-titanium alloy coating with the thickness of 50-500 nanometers is formed on the surface of the micro-nano porous copper powder through electrochemical deposition. Through the graded hole design of the micro-nano porous copper powder, a main hole channel provides a rapid electron transmission path, the powder gap stress is eliminated in the low-temperature pre-pressing stage, and atom diffusion and densification are promoted in the high-temperature and high-pressure stage, so that the resistance can be effectively reduced, the loss of energy in the transmission process is reduced, and the energy transmission efficiency of the whole system is improved.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention discloses high-strength stainless steel for a wheel hub cover and a machining process of the high-strength stainless steel, and relates to the technical field of stainless steel machining. The specific processing technology comprises the following steps: weighing a stainless steel raw material, smelting under nitrogen pressurization, carrying out protective pouring to obtain a cast ingot, carrying out hot forging and hot rolling to obtain a hot-rolled plate, carrying out solution treatment and water quenching, sequentially carrying out multi-pass cold rolling and single-pass liquid nitrogen heat preservation cold rolling, annealing and aging treatment to obtain a stainless steel base material, and sequentially carrying out grinding, polishing, oil removal and acid activation to obtain the stainless steel plate. And then placing in an electroplating solution for electro-deposition of an alloy plating layer, cleaning after electro-deposition is finished, then carrying out laser cladding, finally carrying out heat treatment, and cutting a thin layer to obtain the high-strength stainless steel. Wherein cladding powder adopted for laser cladding comprises cobalt powder, chromium powder, nickel powder, aluminum powder, molybdenum powder, titanium powder, zirconium powder, nano carbon-nitrogen metal and tungsten carbide.

The invention discloses a gradient pressing and pore interlocking titanium-aluminum composite profile preparation method which comprises the following steps: S1, density differential pressing of titanium powder, unequal-thickness powder filling is carried out in a cavity, and a gradient density titanium material layer is formed through pressing; s2, primary sintering is conducted, specifically, the titanium material layer with the gradient density in the step S1 is sintered; s3, aluminum powder is pressed, specifically, aluminum alloy powder is added into the mold for secondary pressing compounding to form an aluminum material layer, and the aluminum powder permeates to the surface of the loose layer; and S4, secondary sintering permeation enhancement is carried out, vacuum sintering and pressure sintering are carried out, the aluminum material layer is in a semi-molten state in the sintering process, and on the basis of the capillary action principle, the aluminum material permeates and fills pores in the loose layer to form pore interlocking. The gradient structure with the compact outer side and the porous inner side is formed on the titanium layer through an unequal-thickness mold and step-by-step pressing, directional pores preset in the porous layer provide channels for aluminum permeation, and the permeation depth reaches 150 microns and is increased by three times compared with a conventional process.

The invention discloses a copper-based friction plate of a wind power high-speed shaft brake and a manufacturing method, the friction plate comprises a friction material, the friction material comprises a friction layer and a friction layer, the friction layer comprises the following raw materials in percentage by weight: 65-72% of copper powder, 1-6% of iron powder, 3-10% of high-carbon ferrochrome powder, 8-15% of copper-tin-titanium powder and 15-20% of graphite powder; 1 to 5% of TiB2; and the transition layer comprises the following raw materials in percentage by weight: 70-75.4% of iron powder, 23-28% of copper powder, 1-3% of graphite powder and 0.6-1.2% of copper welding powder. The friction plate in the technical scheme is low in cost, does not contain harmful elements such as lead, meets the environmental protection requirement, integrates the advantages of a copper-based friction plate and an iron-based friction plate, has a stable friction factor and good wear resistance, and has the friction performance superior to that of an imported friction plate.

The invention discloses a low-cost high-polishing titanium alloy plug housing injection molding method, and belongs to the technical field of metal injection molding. The method comprises the following steps: powder preparation, raw material weighing, internal mixing, granulation, injection molding, acid degreasing, thermal degreasing and vacuum sintering, and polishing. Titanium alloy powder used in the method is composite powder formed by adding 0-50 [mu] m non-spherical powder into 0-60 [mu] m spherical powder prepared through a plasma atomization method (PDPA). The cost of the non-spherical titanium powder is far lower than that of spherical titanium powder, and the production cost is relatively reduced by more than 80%; the 0-60 [mu] m spherical powder prepared by the plasma atomization method is high in powder permeability, and sintering densification is facilitated; the sintering shrinkage coefficient of the porous titanium alloy part with the complex shape prepared through vacuum sintering is accurately controlled to be 1.20-1.350, and extra shaping matched equipment is not needed; according to the high-polishing titanium alloy product part manufactured through the method, the density is larger than or equal to 4.45 g / cm < 3 >, the tensile strength is larger than or equal to 950 MPa, the elongation after fracture is larger than or equal to 12%, and the hardness is larger than or equal to 350 (HV).

The invention relates to an agglomerated ceramic abrasive which is prepared from the following raw materials in percentage by weight: 25-30% of a ceramic bond, 65-70% of diamond micro-powder, 1-3% of titanium powder, 2.5-5% of nitrate, 0.3-0.5% of nickel sulfate and 1-3% of aluminum zirconate, and is prepared by the following steps: adding water into the raw materials, uniformly mixing, and grinding; and then carrying out spray granulation, impurity drying and sintering to obtain the agglomerated ceramic abrasive material. Compared with a common ceramic bond diamond agglomerated abrasive material, the agglomerated ceramic abrasive material prepared by the method has the advantages of high hardness, uniform particle distribution, good grinding performance and the like. When the agglomerated ceramic abrasive is used for polishing marble tiles, no obvious scratches appear on the surfaces of the tiles, the surface consistency is good, and the polishing efficiency of the marble tiles is high.

The invention discloses a titanium fibrofelt composite material and a PEM electrolytic tank containing the titanium fibrofelt composite material, and relates to the technical field of PEM electrolytic tanks. The titanium powder mixture is filled in the titanium fibrofelt base material on one side of the second surface of the titanium fibrofelt base material, and the particle size of the first titanium powder, the particle size of the second titanium powder, the mass ratio of the first titanium powder to the second titanium powder, and the porosity and the average pore size of the titanium fibrofelt base material are controlled to be within a proper range; the titanium fibrofelt composite material has the advantages that the titanium fibrofelt base material can be well filled with the titanium powder, and a pore structure with proper pore diameter and pore diameter distribution can be formed in the titanium fibrofelt base material, so that when the titanium fibrofelt composite material is used as an anode gas diffusion layer of a PEM electrolytic tank, the cooperative transmission effect of water and oxygen is good, the mass transfer loss in the operation process of the electrolytic tank is low, and the service life of the electrolytic tank is prolonged. The internal temperature of the electrolytic tank is easy to control.

The invention discloses an anode porous transmission layer for PEM water electrolysis hydrogen production and a preparation method of the anode porous transmission layer. The preparation method comprises the steps that firstly, a porous titanium plate and a titanium mesh are washed and dried after being subjected to acid pickling; secondly, absolute ethyl alcohol, polyvinyl butyral and titanium powder are evenly mixed to be prepared into slurry, and the slurry is sprayed to the two sides of the dried titanium mesh; and 3, stacking the porous titanium plate and the titanium mesh sprayed with the slurry, and forming metallurgical bonding through vacuum diffusion welding to obtain the anode porous transmission layer. The porous titanium plate and the titanium mesh are metallurgically bonded to prepare the anode porous transmission layer, the platinum plating amount is effectively reduced and the catalyst utilization rate is improved by regulating and controlling the thickness and the pore structure of the porous titanium plate and the plate-mesh stacking mode, and the gas-liquid transmission efficiency of the anode porous transmission layer is improved; and the anode porous transmission layer with strong mechanical support and high gas-liquid transmission efficiency is obtained, is suitable for PEM water electrolysis hydrogen production, and meets the development requirements of high efficiency and low cost of hydrogen production through renewable energy source and PEM water electrolysis coupling.

The invention belongs to the technical field of laser additive manufacturing, and discloses a preparation process for additive manufacturing of a pure titanium part, the pure titanium part and application. The preparation process for additive manufacturing of the pure titanium part comprises the steps that a three-dimensional model diagram of the pure titanium part is created, and an STL file is generated; the STL file is imported into data processing software to be subjected to hierarchical slicing processing, and a scanning path is generated; pure titanium powder is adopted as raw material powder, laser powder bed melting additive manufacturing is carried out, and a blank is obtained; the blank is subjected to heat treatment and surface treatment, and the additive manufacturing pure titanium part is obtained; wherein the heat treatment sequentially comprises first-stage heat treatment and second-stage heat treatment; the surface treatment comprises surface polishing. According to the preparation process for additive manufacturing of the pure titanium part, internal defects can be reduced, grains are refined, residual stress is reduced, and the surface quality is improved, so that the plasticity (elongation after fracture) and the fatigue performance of the pure titanium part are remarkably improved.

The invention discloses a gas diffusion layer with a gradient pore structure and a preparation method of the gas diffusion layer. The preparation method comprises the following steps: 1, immersing a titanium diamond net into liquid paraffin; 2, absolute ethyl alcohol, tributyl phosphate, polyvinyl butyral and two kinds of spherical titanium powder with different granularities are evenly mixed to prepare second slurry containing coarse-grained spherical titanium powder and first slurry containing fine-grained spherical titanium powder, and the second slurry and the first slurry are sequentially sprayed to the surface of the titanium rhombus net filled with paraffin; and 3, degreasing and sintering the sprayed titanium diamond net for one-step forming to obtain the gas diffusion layer with the gradient pore structure. According to the method, the slurry containing the spherical titanium powder with the coarse granularity and the spherical titanium powder with the fine granularity is sequentially sprayed on the titanium diamond net and sintered, the gas diffusion layer with the gradient hole structure is obtained, it is guaranteed that the gas diffusion layer has the high catalyst utilization rate, high mechanical strength and good gas-liquid transmission, and the structure can be adjusted according to the actual working condition so as to regulate and control the performance of the gas diffusion layer; the method is suitable for the field of PEM electrolytic hydrogen production.

The invention relates to a preparation method of a titanium-based composite material based on high-entropy boride ceramic modification, and belongs to the technical field of titanium-based composite material powder metallurgy. The high-entropy boride ceramic is (ZrHfTaTi) B2 in an equal molar ratio. The preparation method comprises the following steps that firstly, high-entropy boride ceramic powder and pure titanium powder are evenly mixed through ball-milling mixing, then the mixed powder is subjected to rapid hot pressing sintering, a sintered block is subjected to hot rolling treatment, and finally the titanium-based composite material is obtained. The composite material has excellent room-temperature and high-temperature comprehensive mechanical properties, the performance is greatly improved compared with commercial pure titanium, and the composite material can be used for manufacturing high-performance parts in the fields of aerospace and the like.

The invention discloses a solder for a copper-clad ceramic substrate. The solder comprises mixed metal powder and an organic carrier, the mixed metal powder is composed of Cu powder, titanium powder, nickel powder and nano CeO2; the organic carrier is prepared from the following components in percentage by weight: 2 to 5 weight percent of organic thickening agent, 3 to 18 weight percent of organic mixed solvent and 0.2 to 3 weight percent of degreasing accelerant; the solder is formed by mixing mixed metal powder and an organic carrier according to the mass ratio of 85: 15-90: 10. An existing soldering paste formula is optimized, the degreasing accelerant is added, the degreasing capacity of the soldering paste is improved, and the porosity after brazing is reduced.

The invention discloses a self-healing basalt fiber reinforced copper-based friction material and a preparation method thereof, and relates to the technical field of friction materials, the self-healing basalt fiber reinforced copper-based friction material comprises the following raw material components by mass: 0-1.5 wt.% of graphene, 0-2 wt.% of boron, 0-4 wt.% of diboron trioxide, 0-10 wt.% of graphite, 0-5 wt.% of titanium powder, 0-4 wt.% of copper-plated basalt fiber and 84.75-94.75 wt.% of copper powder. And preparing the self-healing basalt fiber reinforced copper-based friction material by adopting a vacuum hot pressing sintering process. In a preparation process and a use scene of the material, temperature rise enables the self-healing components to be melted and softened, so that the self-healing components are filled in pores or cracks between a reinforced phase and a matrix, the material generates a self-healing effect of self-repairing, and meanwhile, the material has very good mechanical properties and friction properties.

The invention provides a near-net-shape preparation method of an ultrahigh-strength wear-resistant aluminum alloy drill rod, and relates to the technical field of drill rod preparation. The near-net-shape preparation method comprises the following steps: carrying out ball-milling mixing on titanium powder and aluminum powder in a protective atmosphere, and calcining in a nitrogen atmosphere to obtain composite powder; the method comprises the following steps: ball-milling aluminum alloy powder of drill rod components, filling the ball-milled aluminum alloy powder into a U-shaped silica gel sheath with a hollow core part, and carrying out cold isostatic pressing to form a hollow aluminum alloy round billet; the billet is placed in the center of a U-shaped silica gel sheath, the periphery of the billet is filled with the composite powder, and an aluminum alloy hollow composite billet is obtained through cold isostatic pressing after compaction and vacuumizing; sintering and densifying the composite billet to obtain a sintered ingot; the sintered ingot is subjected to hot extrusion, and the full-compact wear-resistant aluminum alloy hollow pipe is obtained; and the hollow pipe is subjected to heat treatment and then machined, and finally the ultrahigh-toughness aluminum alloy drill rod with the wear-resistant layer is obtained. The method is short in production process flow, high in material utilization rate and beneficial to industrial large-scale production, popularization and application.

The invention provides a binder system for beryllium-titanium alloy powder injection molding and application, and relates to the technical field of metal powder injection molding. The adhesive system consists of the following components in percentage by weight: 76 to 84 percent of polyformaldehyde, 7 to 9 percent of high-density polyethylene, 5 to 7 percent of ethylene-vinyl acetate copolymer, 3 to 5 percent of paraffin, 0.1 to 0.5 percent of stearic acid, 0.1 to 1.5 percent of polyethylene glycol and 0.1 to 1 percent of BASF antioxidant. The feed preparation method based on the system comprises the steps of powder pretreatment, binder preparation, banburying mixing and cooling granulation, and uniform coating and dispersion of beryllium-titanium powder can be achieved. According to the system, the problems that in beryllium-titanium alloy injection molding, powder is prone to oxidation, poor in fluidity and low in size precision are solved, the viscosity of the prepared feed at 180 DEG C is 88-101 Pa.S, and the oxygen content is smaller than or equal to 0.24 wt%; the relative density of a finished product is larger than or equal to 96.5%, the size precision is + / -1% / in-+ / -2% / in, and the method is suitable for industrial production of beryllium-titanium alloy complex parts in the fields of spaceflight and nuclear energy.

The invention discloses an oxygen control process for injection-molded titanium alloy based on oxygen-free solvent degreasing, which belongs to the technical field of powder metallurgy materials and comprises the following steps of: banburying and cooling pre-alloyed titanium powder and a binder matrix, granulating and injection-molding, and degreasing, drying and sintering by using an oxygen-free solvent. According to the method, a full-process oxygen control process chain of vacuum pre-drying of pre-alloyed titanium powder, preparation of an oxygen-free binder, extraction and degreasing of an oxygen-free solvent, vacuum thermal degreasing and graphite furnace temperature control sintering is constructed, invasion of impurity elements such as carbon, oxygen and nitrogen is blocked from the source to a finished product, and the core bottleneck that the oxygen content of the powder metallurgy titanium alloy is difficult to control is solved; and the consistency of the strength and plasticity of the product is guaranteed through stable impurity control, and performance fluctuation caused by out-of-control of the oxygen content is avoided.

The invention relates to the technical field of metal material connection, in particular to a magnesium alloy low-temperature diffusion welding method and a magnesium alloy connector, and the magnesium alloy low-temperature diffusion welding method comprises the steps that metal powder is adopted to conduct cold spraying on the surfaces of two magnesium alloys to be welded, a metal coating is formed on the surface of each magnesium alloy to be welded, and the metal powder comprises at least one of copper powder, nickel powder, titanium powder and silver powder; carrying out surface self-nanocrystallization treatment on the metal coating of each magnesium alloy to be welded; and diffusion welding is conducted on the two to-be-welded magnesium alloys subjected to surface self-nanocrystallization treatment through the spark plasma sintering technology. The method aims at solving the problem that the welding effect of the magnesium alloy is affected due to the existence of an oxidation film.

The invention relates to a high-heat-resistance PPS protective material and a preparation process thereof. The protection material is prepared from the following components in parts by weight: PPS resin, modified glass fiber, surface modified boron nitride, element doped modified silicon carbide, an ABS-g-MAH and POE-g-MAH compound, nano aluminum oxide, an antioxidant, an interface modifier and a synergistic stabilizer in a specific proportion. Wherein the modified glass fiber is prepared by reacting glass fiber with an ethanol solution, potassium hydroxide and the like; the surface modified boron nitride is obtained by treating nano boron nitride, a sodium hydroxide solution and the like; the element-doped modified silicon carbide is prepared by reacting silicon carbide powder with nano titanium powder and the like. The preparation process sequentially comprises the following steps: carrying out ultrasonic pretreatment and vacuum drying to obtain a mixture 1, mixing by a high-speed mixer to obtain a mixture 2, carrying out extrusion granulation and vacuum devolatilization by a twin-screw extruder, carrying out water-cooling granulation, drying to obtain granules, preparing a standard sample through injection molding, testing the performance and the like, wherein each step has corresponding specific parameters. The material has high heat resistance, the heat distortion temperature can reach 280 DEG C or above, and the material can be used as a protection material in the field needing high heat resistance.

The invention belongs to the technical field of proton exchange membrane electrolytic cells, and particularly relates to a microporous titanium-based diffusion layer for a proton exchange membrane electrolytic cell and a preparation method of the microporous titanium-based diffusion layer. The preparation method comprises the following steps: mixing titanium powder, a binder and a solvent, coating a titanium-based substrate with the mixture, and carrying out degumming and sintering to obtain the microporous titanium-based diffusion layer for the proton exchange membrane electrolytic cell. By adopting the method disclosed by the invention, the surface structure of the gas diffusion layer of the titanium-based substrate can be optimized in batches, so that the purposes of reducing roughness, increasing the contact area with a membrane electrode, reducing contact resistance, increasing mass transfer efficiency and improving the electrochemical performance of an electrolytic tank in an electrolytic bath are achieved; the technical defects of a gas diffusion layer obtained by a preparation method in the prior art are overcome.

A method including fabricating a prosthesis core from UHMWPE; positioning the prosthesis core within a pressure vessel; filling the pressure vessel with titanium powder having a D50 particle size that is from 200 to 250 microns to a fill level of at least 110% of the height of the prosthesis core within the pressure vessel; sealing the pressure vessel by positioning a pressure plate in contact with the titanium powder; maintaining the pressure vessel at a heated temperature that is from 150 to 200 degrees Celsius and a pressure that is from 10 to 50 MPa for a time that is from 10 to 600 minutes; cooling the pressure vessel to room temperature including a controlled cooling phase to a step-down temperature at a controlled rate of from 0.1 to 10 degrees Celsius per hour, thereby producing a prosthesis including the prosthesis core and a coating including the titanium powder.

The invention relates to a preparation method of a double-layer high-temperature adhesive for connecting brass and aluminum oxide, which comprises the following steps: reacting aluminum hydroxide, zirconium hydroxide and dilute phosphoric acid to prepare an aluminum zirconium phosphate adhesive base solution, and compounding silicon powder, boron carbide, titanium powder, nickel powder and the adhesive base solution to prepare a special adhesive for coating a brass surface. And compounding silicon powder, boron carbide, titanium powder, nickel powder, aluminum oxide and the gum base solution to prepare the special adhesive for aluminum oxide surface coating. The brass surface coating special glue is brushed on the brass surface and cured, then the aluminum oxide surface coating special glue is brushed on the aluminum oxide surface, the brass coated with the adhesive and the aluminum oxide coated with the adhesive are attached together in the mode that the bonding surfaces are opposite, and the brass / aluminum oxide double-layer bonding piece is obtained after pressing and curing and can serve in the high-temperature environment. The method has the advantages that the special glue for brass surface coating and the special glue for aluminum oxide surface coating have high thermal expansion coefficient matching with brass and aluminum oxide, and thermal stress can be relieved; the double-layer adhesive can provide the bonding strength which can reach 1.3 MPa at the temperature of 500 DEG C.

The invention relates to a preparation method of a molybdenum-titanium alloy target material, which comprises the following steps: mixing molybdenum powder and titanium powder in a protective gas atmosphere to obtain mixed powder; the mixed powder is subjected to cold isostatic pressing, sheath degassing, hot isostatic pressing and vacuum annealing in sequence, and then the molybdenum-titanium alloy target material is obtained; the average particle size of the molybdenum powder is 3-5 [mu] m, and the average particle size of the titanium powder is 100-150 [mu] m; according to the preparation method, the molybdenum-titanium alloy target material which only contains a pure molybdenum phase and a molybdenum-titanium alloy phase and is high in density and low in content of gas impurity elements is prepared by selecting raw materials with specific particle sizes and matching specific procedures; wherein the proportion of the molybdenum-titanium alloy phase is preferably as high as 50% or above, the density is preferably as high as 99.9% or above, the hydrogen content is preferably as low as 3 ppm or below, the oxygen content is preferably as low as 576 ppm or below, and the problem that the product yield is low due to the fact that an existing molybdenum-titanium target is likely to be abnormal in the sputtering process is effectively solved.

The invention discloses a welding wire for delta-TRIP steel and a tailored blank laser welding method, and belongs to the technical field of tailored blank laser welding. The welding wire comprises, by mass, 0.08%-0.2% of C, 0.4%-1.2% of Si, 0.8%-1.8% of Mn, 3%-10% of modified titanium powder, smaller than or equal to 0.005% of S, smaller than or equal to 0.02% of P and the balance Fe and inevitable impurities. Wherein the titanium element is added in the form of modified titanium powder, and the modified titanium powder is prepared by mixing titanium powder, rare earth oxide and boron powder and then performing high-energy ball milling. According to the tailored blank laser welding method, annular light spot welding is adopted, a composite induction preheating-post-heating process is matched, and compressed air is used as shielding gas. According to the method, the volume fraction of the Ti (C, N) strengthening phase in the weld joint can be remarkably increased to 5.5%-7.5%, the weld joint structure is effectively refined, generation of thick columnar crystal delta-ferrite is inhibited, and a welded joint has excellent strength, plasticity and forming performance.

The invention belongs to the field of vanadium-aluminum alloy smelting. The invention discloses a preparation method of a high-density low-defect vanadium-aluminum alloy. The method comprises the following steps: crushing raw materials; drying the raw materials; aluminum is prepared according to the amount of residual aluminum in the alloy accounting for 106%-108% of the theoretical amount of aluminum participating in the oxidation-reduction reaction, and the dried raw materials are evenly mixed; the mixed materials are put into a smelting furnace, and the composite flux is flatly laid on the materials; tiling titanium powder on the composite flux; igniting the titanium powder to carry out thermit reaction on the furnace charge in the furnace; gradient extreme cooling is conducted on the alloy, and sequential solidification from bottom to top is achieved at the temperature gradient of 50-100 DEG C / h; and after solidification, disassembling the furnace, carrying out water quenching, and cooling to obtain the vanadium-aluminum alloy. According to the method, the problems of surface oxidation, internal cracking, bottom loosening and the like of the vanadium-aluminum alloy can be synchronously solved, and the compactness and quality of the vanadium-aluminum alloy are remarkably improved.