610 results about "Vacuum sintering" patented technology

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

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 technical field of solid waste recycling and functional building materials, in particular to a wave-absorbing wall material based on a waste glass fiber wind power blade and a preparation method of the wave-absorbing wall material. The wave-absorbing wall material based on the waste glass fiber wind power blade is mainly prepared from the following raw materials in parts by mass: 60-68 parts of waste glass fiber wind power blade granules, 30-35 parts of silicon-aluminum solid wastes, 2-5 parts of a wave-absorbing reinforcing agent and 6-10 parts of water. According to the invention, waste wind power blades and silicon-aluminum solid wastes are used as raw materials, a high-strength porous carbon skeleton structure is formed in the material through a vacuum pugging molding and vacuum sintering process, and meanwhile, a ferrite wave-absorbing reinforcing agent is mixed to form a composite wave-absorbing electromagnetic structure of a carbon aggregate-dielectric loss material and a ferrite particle-magnetic loss material; collaborative optimization of the electromagnetic wave absorption performance and the material mechanical property is achieved, and good ecological value and economic benefits are achieved.

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 relates to the technical field of silicon carbide boat support manufacturing, and particularly discloses a silicon carbide boat support and a manufacturing method thereof.The manufacturing method comprises the following steps that S1, the boat support is designed through three-dimensional modeling software; s2, uniformly mixing the silicon carbide powder with various particle sizes; s3, slurry preparation: stirring and mixing the powder and a curing agent to obtain slurry; s4, the three-dimensional model slices of the boat support are printed and formed through a 3D printing device, and glue is smeared between every two layers of slices; s5, performing hot air drying on the blank in a drying oven; s6, in a vacuum sintering furnace, the blank is subjected to vacuum sintering and glue discharging; s7, the blank is subjected to polishing, machining, sand blasting, purification, ultrasonic cleaning and drying process treatment; compared with traditional injection molding, the silicon carbide boat support is manufactured through 3D printing, mold production and manufacturing can be omitted, and the production cost is reduced; and various forming parameters are visualized, so that the forming difficulty is reduced, and the yield of the silicon carbide boat support is improved.

The invention relates to the technical field of electrical material preparation, in particular to a preparation method of a graphene reinforced tungsten-copper composite material. Comprising the following steps that 40-50 parts by volume of graphene powder and 50-60 parts by volume of copper powder are weighed, stirred and mixed, and premixed graphene copper composite powder is obtained; 25-35 parts by volume of the premixed graphene copper composite powder and 2-4 parts by volume of absolute ethyl alcohol are weighed, mixed and ball-milled, then isostatic pressing forming, vacuum sintering, machining and powdering are conducted, and graphene copper composite powder is obtained; 60-80 parts by mass of tungsten powder, 32-36 parts by mass of copper powder, 4-8 parts by mass of graphene copper composite powder and 5-8 parts by mass of paraffin are weighed, mixed ball milling, cold press molding, vacuum sintering, re-pressing and re-sintering and cooling are conducted, and the graphene reinforced tungsten copper composite material is obtained. According to the preparation method disclosed by the invention, the graphene tungsten copper composite material with excellent mechanical property and electrical property is obtained by combining the graphene copper composite powder with a re-pressing and re-sintering process.

The invention provides a semiconductor grade silicon dioxide vacuum sintering furnace which comprises a furnace body, a heating cavity is formed in the middle of the furnace body, and a rear door body is arranged at the first end of the furnace body; the material dragging trolley is arranged in the furnace body in a sliding mode, and a workpiece is placed on the material dragging trolley; the front door body is arranged on one side of the material dragging trolley, and when the material dragging trolley slides into the heating cavity, the front door body seals the second end of the furnace body; the device has the beneficial effects that through the arrangement of the pressing and rotating assembly, a workpiece on the material dragging trolley can be fixed from the two ends, it is ensured that the workpiece is always kept stable in the heating process, and the workpiece can be driven to rotate by the pressing and rotating assembly. In the heating process, the workpieces can be heated more uniformly through rotation of the workpieces, the heating effect and the product quality are improved, the workpieces can be automatically assembled and disassembled through arrangement of the material dragging trolley, the labor intensity of workers is reduced, and the working efficiency is improved.

The invention discloses a SiC power module sintering packaging method, and relates to the technical field of power module packaging, and the method comprises the steps: sequentially carrying out the ultrasonic cleaning, plasma activation and drying of a SiC chip and a ceramic substrate, and obtaining an activated ceramic substrate and a SiC chip; the surfaces of the activated ceramic substrate and the SiC chip are spin-coated with nano-silver paste, and a nano-porous silver layer is formed through pre-curing and low-temperature sintering; aligning the graphene / nano-porous silver composite layer chip with the ceramic substrate, performing segmented pressure sintering in a vacuum sintering furnace, and outputting a SiC power module; the SiC power module is subjected to epoxy resin packaging glue coating, ultraviolet light curing and annealing treatment, internal stress is eliminated, and the corrosion resistance is enhanced; and screening a SiC power module, performing XRD and SEM detection, coating a high-temperature-resistant silica gel sealing layer, performing curing, and outputting a finished product. Through the epoxy resin packaging adhesive coating and thermal-acoustic combined annealing technology, the residual stress of the packaging interface is released, the service life of the SiC power module is prolonged, and the adaptability of the SiC power module is improved.

The invention discloses a recrystallized silicon carbide ceramic tube. The recrystallized silicon carbide ceramic tube is prepared from silicon carbide powder comprising three components of recrystallized silicon carbide powder, 100F powder and powder with D50 of 20-25 microns through the processes of mixing, aging, pugging, extrusion forming, microwave drying and vacuum sintering. Compared with a two-component recrystallized silicon carbide ceramic, the multi-component silicon carbide powder can reach the maximum bulk density, so that the mechanical property of the recrystallized silicon carbide ceramic is improved. Compared with two-component recrystallized silicon carbide ceramics, the recrystallized silicon carbide ceramic tube prepared by the invention has the advantages that the high-temperature bending strength is averagely improved by 128 MPa, and the improvement rate is 177%; the compressive strength is averagely improved by 152MPa, and the improvement rate is 104%; the heat conductivity coefficient is averagely improved by 99W / m.K, and the improvement rate is 69%. And the material is especially suitable for key equipment in semiconductor and photovoltaic production processes. And the preparation process is mature and is beneficial to industrialization.

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 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 AMB copper-clad ceramic substrate and a welding method thereof.The welding method comprises the steps that metal powder containing inactive elements Ag and Cu and an active element Ti is mixed with an organic carrier, and active soldering paste is obtained; and coating the active soldering paste on the surface of a ceramic substrate, stacking copper foils on the surface, coated with the active soldering paste, of the ceramic substrate, and performing vacuum sintering to obtain the AMB copper-clad ceramic substrate. According to the AMB copper-clad ceramic substrate and the welding method thereof provided by the invention, the process is improved when the AMB realizes metallization of the ceramic substrate, so that the obtained AMB copper-clad ceramic substrate has the characteristics of high interface bonding force, low warping degree and voidage, excellent cold and hot impact resistance and the like.

The invention discloses a tungsten-zirconium active material and a preparation method thereof. The method comprises the following steps: 1, mixing tungsten powder, nickel powder, iron powder and zirconium hydride powder to prepare mixed powder; 2, carrying out one-time compression molding on the mixed powder by adopting a cold isostatic press to obtain a pressed blank; 3, performing vacuum dehydrogenation treatment on the pressed blank by adopting a vacuum degumming furnace to obtain a pre-sintered blank; and 4, carrying out vacuum sintering on the pre-sintered blank by adopting a vacuum sintering furnace to prepare the tungsten-zirconium active material. The powder metallurgy method is adopted, densified sintering is achieved at the low sintering temperature, the problems of tungsten component sedimentation and zirconium powder oxidation are avoided, the tungsten content and the structure uniformity in the tungsten-zirconium active material are improved, the tungsten-zirconium active material with the tungsten mass content as high as 80% is obtained, the material has the remarkable damage effect, armor piercing after-effect is provided for damaged bullet seeds, and the application range of the tungsten-zirconium active material is widened. The method is suitable for the weapon manufacturing field.

The invention provides a Y-rich rare earth permanent magnet and a preparation method and a magnetic performance improving method thereof, and the performance improving method comprises the steps: uniformly mixing to-be-diffused metal powder containing Dy and / or Tb elements with an organic solvent to obtain to-be-diffused alloy liquid; the alloy liquid to be diffused is attached to the surface of the Y-rich rare earth permanent magnet, and the Y-rich rare earth permanent magnet is placed in a vacuum sintering furnace; the Y-rich rare earth permanent magnet is subjected to grain boundary diffusion heat treatment through the vacuum sintering furnace, so that Dy and / or Tb elements are diffused into the surface layer of a main phase lattice of the Y-rich rare earth permanent magnet; and carrying out tempering treatment on the Y-rich rare earth permanent magnet. The problems that the coercive force of an existing Y-containing magnet is difficult to effectively improve, and residual magnetism is easily reduced can be effectively solved.

The invention relates to the technical field of cable preparation, in particular to a superconducting semi-rigid cable made of high-purity aluminum and a preparation method thereof.The method comprises the steps that the high-purity aluminum is adopted as an inner conductor, and the inner conductor is preprocessed; coating the surface of the pretreated inner conductor with a PTFE mixture by using a pushing machine at normal temperature to obtain a normal-temperature pushing core wire; the qualified normal-temperature pushing core wire is wound on a cable reel and then placed in a vacuum high-temperature furnace to be subjected to vacuum sintering so as to obtain an inner conductor wrapped with an insulating layer; and the inner conductor wrapped with the insulating layer penetrates into the processed pure aluminum outer conductor tube, and the outer conductor is wrapped with PTFE to form an outer protective sleeve. According to the invention, the performance stability of the superconducting semi-rigid cable preparation can be improved.

The invention belongs to the field of aluminum-based composite material recycling, and particularly relates to an aluminum-based composite material machining chip recycling method which comprises the steps that oil stains and floating dust on the surfaces of machining chips are removed, and the machining chips are crushed into sheets; carrying out alkali washing and acid washing cleaning to remove an oxide layer; determining a reinforced phase mass fraction through pickling; stirring the flaky material, and performing gravity settling to obtain particles arranged in parallel; performing low-temperature vacuum sintering to obtain a billet; and the aluminum-based composite material with high interface bonding strength and good uniformity is prepared through high-temperature plastic deformation. And the particle reinforced aluminum matrix composite material processing chips are recycled, so that the machining loss is reduced. And the oxide layer is removed, and the particle sintering difficulty is reduced. And the processing chips are arranged in parallel, so that the problems that the sheet-shaped aluminum-based composite material particles are not dense in hot pressing and easy to generate pores due to high strength are solved, and a new scheme is provided for recycling and reusing the composite material.

The utility model relates to a graphite heating device for a vacuum sintering furnace, which comprises a cuboid graphite heater, a cuboid heater outer frame and a cuboid furnace tube, the heater outer frame and the cuboid furnace tube are fixedly arranged in a hearth of the vacuum furnace, and the graphite heater is arranged between the heater outer frame and the cuboid furnace tube; the graphite heater is of an integrated structure, a penetrating groove is formed in the graphite heater in the length direction of the hearth, an annular groove perpendicular to the length direction of the hearth is formed in the graphite heater, only one end of the annular groove is communicated with the penetrating groove, and the portions, on the two sides of the annular groove, of the graphite heater are symmetrically arranged. Electrodes are fixedly arranged on the graphite heater and located on the two sides of the end of a penetrating groove communicated with the annular groove, and a channel is formed between the two electrodes through the graphite heater. The cuboid graphite heater can effectively improve the space utilization rate of a heating area, the heater outer frame and the furnace tube provide effective protection for the graphite heater, and the integrated graphite heating body is good in thermal shock resistance and electric shock resistance, uniform in heating and long in service life.

The utility model relates to the technical field of vacuum sintering machines, and discloses a vacuum sintering machine with a tray module, which comprises a vacuum sintering machine main body and a sealing cover, linear guide rails are fixedly mounted on the front side and the rear side of the vacuum sintering machine main body, guide sleeves are fixedly mounted on sliding tables of the linear guide rails, and polish rods are slidably mounted on the guide sleeves. The right end of the polished rod and the sealing cover are fixedly assembled, a supporting base is fixedly installed at the bottom of the left side of the sealing cover, a tray module is placed on the upper side of the supporting base, and a driving assembly used for lifting the guide sleeve is installed on the upper side of the vacuum sintering machine body. Through the tray module which is detachably used on the supporting seat, the annular parts can be conveniently placed on the tray module after being stamped and installed in the sealing cover, gaps can be reserved between the annular parts, and the heating uniformity and the yield are improved; and structures such as a driving assembly and a guide sleeve are arranged, so that the sealing cover can conveniently carry out translation and lifting movement with the tray module, and the labor amount of workers is greatly reduced.

The invention provides a preparation method of a large-size alloy tantalum blank, which belongs to the technical field of tantalum alloy processing, and comprises the following steps: firstly, selecting tantalum powder and doped powder, and fully and uniformly mixing to obtain alloy tantalum powder; then carrying out cold isostatic pressing molding on the alloy tantalum powder to obtain a square fillet alloy blank; the square fillet alloy blank is placed in a vacuum sintering furnace, direct current is introduced for vertical sintering, the vacuum degree ranges from 1.0 * 10 <-2 > Pa to 1.0 * 10 <-3 > Pa, the sintering temperature ranges from 2400 DEG C to 2600 DEG C, and the heat preservation time ranges from 2 h to 3 h; in the direct current sintering process, non-uniform heating of the interior of the sintered material caused by intermittence is avoided, and the grain structure in the blank is more uniform; and after sintering is completed, inert gas is firstly introduced for rapid cooling in a gradient cooling mode, non-uniformity of crystal grains in the blank caused by overgrowth of the crystal grains due to the fact that the blank is in a high-temperature stage for a long time can be avoided, and then the blank is naturally cooled to the room temperature, so that the large-specification alloy tantalum blank with the mass of 10-15 kg is obtained, and the production efficiency is improved.

The invention discloses a cerium-containing high-abundance rare earth sintered neodymium iron boron permanent magnet which does not contain heavy rare earth and does not need a grain boundary diffusion process and a preparation method thereof. The magnet is formed by crushing and mixing three alloy casting pieces, the three alloy casting pieces are an Nd / Pr-rich phase, a Ce-La-rich phase and a Y-Nd-rich phase respectively, and Ce accounts for more than or equal to 30wt% of the total amount of all rare earth elements; the trace elements (Al, Cu, Ga, Nb, Zr and the like) are uniformly introduced in the smelting stage of each main phase, and grain boundary reconstruction is induced through in-situ hydrotreating to form a thin and continuous rare earth-rich grain boundary phase; and after orientation compression molding, vacuum sintering and multi-stage heat treatment, a sintered magnet with excellent magnetic performance is obtained. According to the product, the intrinsic coercive force Hcj is larger than or equal to 15 kOe, the residual magnetism Br is larger than or equal to 13.7 kG, and the maximum magnetic energy product (BH) max is larger than or equal to 39 MGOe. The problems that a high-Ce magnet is low in coercive force, discontinuous in grain boundary phase and the like are solved, the method does not need to depend on Dy / Tb heavy rare earth and a grain boundary diffusion technology thereof, the cost is reduced by 30% or above, and the method is suitable for the fields of new energy automobiles, wind power generation and the like and has a good industrialization prospect.

The utility model discloses a titanium alloy product sintering device capable of reducing sintering friction, which belongs to the technical field of titanium alloy processing and comprises a mounting base, a conveying device for transportation is mounted on the mounting base, and a plurality of groups of oxide ceramic plates for placing titanium alloy green bodies are arranged on the conveying device. A first mounting frame is mounted on the conveying device, a discharging assembly used for discharging and scraping off sintering powder on the oxide ceramic plate is mounted on the conveying device, and a continuous vacuum sintering furnace is fixedly connected to the upper end of the first mounting frame. Through the mode, the sintering material is sprayed between the contact surfaces of the oxide ceramic plate and the titanium alloy green body through the spraying equipment, so that the friction between the titanium alloy green body and the oxide ceramic plate during sintering can be effectively reduced; cleaning of the oxide ceramic plate, stripping of sintered products and continuous sintering treatment are achieved, and the production efficiency is improved.

The invention discloses a preparation method of a neodymium-yttrium-iron-boron magnet with core-shell heterostructure crystal grains. The method comprises the following steps: preparing neodymium-yttrium-iron-boron rapid-quenching amorphous strips with different yttrium contents through a melting rapid-quenching technology; carrying out crystallization annealing on the amorphous rapid quenching belt at different temperatures, and preparing powder particles with the particle size of 2-5 microns through hydrogen demolishing and jet milling; and the neodymium-yttrium-iron-boron magnet with the core-shell heterostructure is prepared through high-temperature vacuum sintering after orientation forming and cold isostatic pressing of the neodymium-yttrium-iron-boron magnet in a magnetic field. According to the method, dynamic adjustment of distribution of yttrium in a crystal grain core-shell area is achieved by controlling the crystallization temperature of an amorphous rapid quenching zone, and therefore the coercive force of the magnet is improved.

The utility model discloses a powder vacuum sintering furnace, which relates to the technical field of powder vacuum sintering furnaces, and comprises a vacuum sintering furnace body, a temperature control mechanism, a heat dissipation mechanism and a sealing cover, the vacuum sintering furnace body is communicated with the temperature control mechanism through a pipeline, and the heat dissipation mechanism is arranged on the vacuum sintering furnace body. A sealing cover is rotatably connected to the vacuum sintering furnace body, a sintering support is fixedly connected into the vacuum sintering furnace body, a magnet strip is fixedly arranged on the sintering support, and heating rings are evenly arranged on the inner wall of the vacuum sintering furnace body. The groove is formed in the inner wall of the sintering furnace, the exhaust holes are evenly formed in the groove so that the sealing cover can be conveniently opened in the completely-sealed environment, meanwhile, the exhaust holes can be completely matched with a mechanism on the sealing cover, safe sealing in the sintering process of the sintering furnace can be guaranteed, and the sealing performance is improved.

The invention discloses a copper metal complex and a preparation method thereof. The copper metal complex is prepared by mixing copper powder and refractory metal powder, adding a dispersing agent and graphite and carrying out compression and vacuum sintering. The outer layer of the complex structure is copper foil, the inner layer is uniform alloy powder, the complex structure can be used as intermediate alloy for subsequent smelting, the smelting temperature is remarkably reduced, element oxidation is inhibited, and the component uniformity is improved; the method is suitable for preparing the copper-based complexes of various high-melting-point and easily-oxidized elements.

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation process of a core-shell structure enhanced neodymium iron boron magnet. Through a multi-component composite formula of high-abundance rare earth and a small amount of heavy rare earth and in combination with a magnesium interface catalytic pretreatment and grain boundary diffusion technology, a Dy-rich shell layer is formed on the surface of a main phase grain, a core-shell structure is constructed, and the coercivity and the high-temperature stability are remarkably improved. An integrated continuous production technology is adopted in the preparation process and comprises the steps of vacuum melting, continuous ingot casting, jet milling, magnetic field forming and continuous sintering, laser-electrochemical integrated machining is integrated, and high-precision cutting and surface corrosion prevention are achieved. The invention further relates to special equipment, such as a multi-zone intelligent temperature control vacuum sintering furnace and double-shaft stirring-composite magnetic field powder equipment, so that the temperature uniformity and the powder orientation degree are ensured. According to the process, heavy rare earth dependence is reduced, the coercive force reaches 24 kOe or above, the high-temperature magnetic performance attenuation is smaller than or equal to 5%, the production cost is reduced, the efficiency is improved, and the process is suitable for the fields of motors, electronics and the like.

The invention discloses an in-situ generated Ti3SiC2 reinforced YT15 hard alloy and a preparation method thereof, and relates to the technical field of hard alloy preparation, the method comprises the following steps: taking WC powder, Co powder, TiC powder and Si powder as raw materials, carrying out ball-milling mixing, adding absolute ethyl alcohol as a process control agent, drying, carrying out compression molding, sintering in a pressure sintering furnace, and carrying out vacuum sintering to obtain the Ti3SiC2 reinforced YT15 hard alloy. Ti3SiC2 is synthesized in the YT15 hard alloy through an in-situ reaction generated in the sintering process, and the in-situ generated Ti3SiC2 reinforced YT15 hard alloy is obtained. In the sintering process, Ti3SiC2 is generated through in-situ reaction in the YT15 hard alloy, the hardness, the fracture toughness, the density, the thermal stability and the machining performance of the YT15 hard alloy can be improved, and therefore the comprehensive performance of the YT15 hard alloy is optimized.

The invention discloses a preparation method of a composite reinforced TC4 titanium alloy feed and a titanium alloy material. The method comprises the following steps: 1, ball-milling and uniformly mixing TC4 titanium alloy powder, LaB6 powder, Si powder and C powder to obtain mixed powder; 2, mixing the mixed powder with an adhesive, and granulating to obtain a granular composite reinforced TC4 titanium alloy feed; 3, injection molding to obtain an injection green body; 4, performing catalytic degreasing on the injection green body to obtain a brown blank; and 5, the brown blank is subjected to thermal degreasing and vacuum sintering, and the injection-molded TC4 titanium alloy material is obtained. According to the method, trace LaB6 powder, Si powder and C powder are added into TC4 titanium alloy powder to prepare feed, oxygen solid solution in a matrix is reduced, the density of a sintered part is improved, a reinforced phase is generated in situ, the grain boundary bonding strength is improved, composite strengthening is achieved, the mechanical property of the TC4 titanium alloy material is improved, the method is simple, convenient and feasible, the process stability is high, and the method is suitable for industrial production. The invention is suitable for the fields of aerospace and medical instruments.

The invention discloses a part powder metallurgy production process based on regenerated stainless steel powder, and relates to the technical field of part powder metallurgy production. The high-performance stainless steel part is manufactured through the steps of mixing and grinding, forming agent adding, granulating and drying, formula preparing, precise pressing forming, vacuum sintering, finished product detecting and the like. The core is that the particle size and uniformity of the powder are controlled through a unique pretreatment process, the national standard component requirement is met by adopting accurate formula regulation and control, the combination of cracking degreasing and powder metallurgy of the forming agent is synchronously realized in the vacuum sintering process, and an independent degreasing procedure is not needed; compared with a traditional process, the method has the advantages that the energy consumption is greatly reduced, the mechanical property and the corrosion resistance meet the requirements of brands such as 304 / 316, and the method has the advantages of resource recycling and environmental protection and is suitable for production of various products such as valves, fasteners and structural members.

The application provides a preparation method of a high-performance porous titanium-based intermetallic compound filter and relates to the technical field of filter preparation.The method comprises sequentially performing titanium raw material hydrogenation, micron-sized titanium hydride powder preparation, mixed powder preparation, mixed powder dehydrogenation alloying, micron-sized alloy powder preparation, cold isostatic forming mold preparation of the porous titanium-based intermetallic compound filter, titanium-based filter compact preparation and porous titanium-based intermetallic compound filter preparation.The application uses off-grade titanium as a matrix raw material, adds alloying elements such as aluminum and iron, combines the hydrogenation-dehydrogenation process with high-energy ball milling, and then realizes near forming of the porous titanium-based intermetallic compound filter through cold isostatic pressing and vacuum sintering.The prepared filter has high porosity, uniform pore size distribution and excellent corrosion resistance, can be used stably for a long time in a high-temperature and strong-corrosion environment, can realize efficient and high-precision purification of titanium tetrachloride, and is beneficial to industrial large-scale production and popularization.

The invention discloses binding-phase-free TiC-based spherical laser cladding powder and a preparation method thereof, and belongs to the technical field of cladding powder. The preparation raw materials of the binding-phase-free TiC-based spherical laser cladding powder comprise TiC and compound carbide M, the preparation method comprises the following steps: mixing TiC and M with a forming agent, and then carrying out ball milling to obtain mixed slurry; drying and granulating through a centrifugal spray tower to obtain spherical agglomerated powder; and then the spherical agglomerated powder is subjected to vacuum sintering, and finally the sintered material is crushed and screened, so that the binding-phase-free TiC-based spherical laser cladding powder is obtained. The problems that in the prior art, TiC-based spherical powder is low in production efficiency, the wettability of a hard phase and a binding phase is poor, and coating components are not uniform are solved.