656 results about "Titanium powder" patented technology

The invention relates to the field of friction materials, and discloses a high-reliability friction material for an electromagnetic brake and a preparation method of the high-reliability friction material. Raw materials of the friction material comprise benzoxazine, phenolic resin, butyronitrile rubber powder, modified basalt fibers, PBO pulp, ceramic fibers, plant fibers, carbon fiber powder, potassium titanate lamellar crystals, barite, light calcium carbonate, friction particles, wollastonite powder, aluminum-titanium powder, feldspar powder, aluminum oxide, zircon powder, garnet powder, crystalline flake graphite, artificial graphite, flexible graphite and composite metal sulfide. And polymer lubricating material micro powder. The friction material provided by the invention is suitable for a high-temperature and high-humidity environment, the stability of the braking performance of a brake is improved, and the phenomenon that the brake slips due to attenuation of braking torque is reduced.

The invention discloses a TiB2 / TiC reinforced high-silicon heat-resistant aluminum-based composite material and a preparation method thereof, and belongs to the technical field of metal-based composite materials. Aluminum powder, titanium powder and metal oxide powder are mixed and then centrifugally sprayed to be prepared into small balls; mixing the small balls with aluminum powder, boron oxide powder and carbon powder, and pressing into a prefabricated body; smelting the intermediate alloy A, adding the preform and a covering agent for heat preservation, cooling, adding the intermediate alloy B, and stirring to obtain a mixed melt; and degassing and removing impurities from the mixed melt, refining and slagging, and then pouring to obtain the TiB2 / TiC reinforced high-silicon heat-resistant aluminum-based composite material. According to the preparation method, the TiB2 / TiC reinforced phase is generated in situ in the aluminum substrate through two-stage reaction, the reinforced micro-nano TiC and TiB2 ceramic particles are high in bonding capacity with a metal-based interface, a transition interface is free of impurities, and the mechanical property of the material is greatly improved. And the ceramic particles produced by the preparation method have the advantages of good dispersion degree in the matrix, less agglomeration, faster reaction process, fast particle generation speed and no generation of harmful gas.

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 belongs to the technical field of crystallizer copper plate surface treatment, and discloses a crystallizer copper plate surface coating preparation method, which comprises: 1) carrying out ball milling mixing on nickel powder and tungsten powder to obtain first mixed powder; (2) adding titanium boride powder and copper powder into the first mixed powder, and uniformly stirring to obtain second mixed powder; 3) performing vacuum hot pressing sintering or vacuum hot isostatic pressing sintering on the second mixed powder, and then crushing a sintered product to obtain coating composite powder; and (4) after the surface of the crystallizer copper plate base material is pretreated, the coating composite powder is sprayed to the surface of the crystallizer copper plate base material through supersonic flame spraying or plasma spraying, and the surface coating is formed. The surface coating has high hardness and wear resistance, and the interior of the surface coating and the surface coating and a crystallizer copper plate base material have good bonding performance, so that the service life of the crystallizer copper plate is greatly prolonged.

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 preparation method of an iron-silicon-based composite soft magnetic powder core, which comprises the following steps: compounding and uniformly mixing iron-silicon-titanium powder and iron-silicon powder, and carrying out heat treatment in an air atmosphere; and then performing insulation coating on the surface of the magnetic powder by using a polyvinyl alcohol aqueous solution and a nano oxide, and performing compression molding and heat treatment to prepare the iron-silicon-based composite soft magnetic powder core. Compared with a conventional iron-silicon powder core, the iron-silicon-based composite soft magnetic powder core prepared through the method has the advantages that the direct-current bias performance under the condition of 100 Oe is higher than 76%, the volume loss Pcv under the conditions of 50 kHz and 100 mT is lower than 500 mW / cm < 3 >, and the loss performance is obviously improved.

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 a PEM gas diffusion layer for hydrogen production by electrolyzing water, the gas diffusion layer is formed by metallurgical bonding of a titanium microporous layer and a titanium substrate layer, the total thickness of the gas diffusion layer is 110-490 [mu] m, the thickness of the titanium microporous layer is 10-100 [mu] m, the average aperture of the titanium microporous layer is 1-8 [mu] m, the thickness of the titanium substrate layer is 100-480 [mu] m, the average aperture of the titanium substrate layer is 10-25 [mu] m, and the thickness of the titanium substrate layer is 10-30 [mu] m. The invention also discloses a preparation method of the gas diffusion layer, which comprises the following steps: pressing titanium powder to obtain a green body thin strip, then spraying slurry on the green body thin strip, and finally degreasing and sintering. The pore diameter of the titanium substrate layer is regulated and controlled by controlling the particle size of the titanium powder, the feeding speed and the rotating speed of the roller, the pore diameter of the titanium microporous layer is regulated and controlled by controlling the slurry ratio, the particle size of the small-particle titanium powder and the pressure of the spray gun, and the gas diffusion layer for PEM water electrolysis hydrogen production, which ensures the gas-liquid transmission efficiency and effectively reduces the catalyst loading capacity, can be prepared only through one-step sintering.

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 non-shedding high-toughness anticorrosive coating composition and a preparation method and application thereof, and belongs to the technical field of flue anticorrosive coating compositions.The non-shedding high-toughness anticorrosive coating composition is prepared from novolac epoxy resin, nano titanium powder, silicon carbide, cardanol glycidyl ether, glass flakes, a cardanol modified polyamine curing agent and other auxiliaries. The long-chain structure of the cardanol modified polyamine curing agent and the synergistic effect of the cardanol modified polyamine curing agent and the novolac epoxy resin enable a cured product to have a larger degree of freedom under the action of external force, so that the toughness of the cured product is improved, and the corrosion resistance of the cardanol modified polyamine curing agent is improved due to the addition of the nano titanium powder, silicon carbide and glass flakes. The cardanol modified polyamine curing agent and the cardanol modified polyamine curing agent jointly form an effective anti-corrosion system, the corrosion resistance is remarkably improved, a sheet structure of the glass flakes can form a mechanical locking effect, and the flexibility and reactive functional groups of the cardanol modified polyamine curing agent are beneficial to formation of good chemical bonding with a base material, so that the adhesive force of a cured product is enhanced.

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 discloses an in-situ generated TiB2 reinforced GH3230 high-temperature alloy and a preparation method of the in-situ generated TiB2 reinforced GH3230 high-temperature alloy. The in-situ generated TiB2 reinforced GH3230 high-temperature alloy comprises a GH3230 high-temperature alloy component and a TiB2 component, the content of the TiB2 component is 0.3 to 1.5 weight percent; the TiB2 reinforced GH3230 high-temperature alloy is prepared by mechanically and uniformly mixing GH3230 high-temperature alloy powder, titanium powder and Fe2B powder and carrying out selective laser melting forming technology. The TiB2 component is generated in situ in the selective laser melting forming process. The TiB2 enhanced GH3230 high-temperature alloy is prepared through selective laser melting forming, and TiB2 is generated in situ in the forming process; the method is easy to operate, high in practicability and suitable for industrial production, the economic cost and the time cost can be reduced, and the tensile strength, the yield strength and the ductility of the alloy material can be improved.

The invention relates to a titanium-aluminum composite material and a preparation method and application thereof, and the preparation method comprises the following steps: ball-milling and mixing titanium powder and aluminum powder, sequentially carrying out die filling, sheath welding and hot isostatic pressing treatment, and then sequentially carrying out sheath removal and machining to obtain the titanium-aluminum composite material, the diameter of the titanium-aluminum composite material ranges from 250 mm to 350 mm, and the thickness of the titanium-aluminum composite material ranges from 450 mm to 550 mm. The titanium powder and the aluminum powder are uniformly mixed through ball-milling mixing, the material is subjected to hot isostatic pressing forming through the sheath, the cost is low, the density improvement effect is remarkable, the large-size titanium-aluminum composite material can be prepared through hot isostatic pressing, batch production of the material is facilitated, the preparation period is greatly shortened, and the production cost is reduced. The problems that titanium-aluminum composite material particles are prone to agglomeration, difficult to form, low in density and uneven in structure are solved.

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 object of the present invention is to provide an anatase type titanium oxide powder having a large specific surface area and high dispersibility, and a method for producing the same. The titanium oxide powder has a BET specific surface area of ​​300 m2 / g or more and 480 m2 / g or less as measured using a nitrogen adsorption method, an anatase content of the crystal phase of 90% or more as measured using XRD measurement, and a spin-spin relaxation time T2 of 46 ms or more and 103 ms or less as measured by pulse NMR of a 5% by mass suspension prepared in ion-exchanged water.

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 high-strength 6082 aluminum alloy, and relates to the technical field of alloys. When the high-strength 6082 aluminum alloy is prepared, firstly, aluminum chloride, titanium tetrachloride, chromium chloride, cerous nitrate and lanthanum nitrate serve as precursors, carbon fibers are doped, a reinforced phase A is prepared after heat treatment, secondly, aluminum powder, titanium powder, copper powder, chromium powder and manganese powder are prepared into high-entropy alloy to serve as a reinforced phase B, and finally, the high-strength 6082 aluminum alloy is prepared. And the reinforced phase A, the reinforced phase B and the aluminum alloy powder are mixed to prepare the aluminum alloy. The high-strength 6082 aluminum alloy prepared through the method has the good mechanical property.

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 utility model provides a titanium powder porous felt board, and belongs to the technical field of metal powder sintering. Comprising a supporting net and a titanium powder layer arranged on at least one face of the supporting net, a plurality of net holes are formed in the supporting net, the net holes are filled with titanium powder, the supporting net is made of pure titanium materials, and the titanium powder layer and the supporting net are formed and fixed through a sintering process. According to the titanium plate, the supporting net made of the pure titanium material is arranged in the traditional titanium powder sintered titanium plate, the titanium powder is filled into the net holes in the supporting net, and the sintered titanium plate is supported by the supporting net, so that the structural stability of the titanium plate is higher than that of the traditional titanium plate, the manufacturing area of the titanium plate can be enlarged, lengthened and thinned, and the effect of improving the toughness and strength of the titanium plate is achieved.