261 results about "Vacuum sintering" patented technology

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 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 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 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 present application relates to thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with diaphosphorus pentoxide and zirconium oxide powder to obtain mixed powder; the mixed powder is put into a closed ball mill tank and mixed with zirconium oxide balls, then a dispersing agent is added and mixed and ball milled; then a binder is added to the ball mill tank and ball milled; the synthesized powder after ball milling is sieved through a 500 mesh sieve, the sieved synthesized powder is poured into a vibrating mold, pressed, and a die pressed blank is formed; the blank is put into a cold isostatic pressing machine and pressed and pressure maintained, to obtain a zirconium magnesium phosphate solid electrolyte target material blank after cold isostatic pressing; the zirconium magnesium phosphate solid electrolyte target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, after multi-stage heat preservation, the furnace is naturally cooled to room temperature, to obtain a thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material. The composition of the solid electrolyte target material of the present application is uniform, facilitating thin film deposition.

The invention discloses a manufacturing method for a meat grinder blade. The manufacturing method comprises the following steps that S01, 440C cutter steel powder is selected; s02, an injection mold corresponding to the meat grinder blade is selected, the injection mold comprises a front mold body and a rear mold body, and the front mold body and the rear mold body are heated; s03, the 440C cutter steel powder is fed into an injection molding machine to form a blank; step S04, trimming the blank piece; s05, the blank is placed on the ceramic plate, the ejector pin face of the blank faces upwards, and the sprue face of the blank faces downwards; s06, the blank obtained after workpiece placing is completed is transferred into a vacuum degreasing furnace to be degreased; s07, the blank is transferred into a vacuum sintering furnace to be sintered; s08, the sintered blank is transferred to a flat grinding machine to be subjected to flat grinding; s09, the blank piece obtained after plane grinding is checked, and the blank piece which is checked to be qualified is subjected to magnetic polishing; the concentricity of the shaft hole of the meat grinder blade and the blade body can be improved, and the coaxiality of the assembled meat grinder blade is correspondingly improved.

The invention belongs to the technical field of insulator processing equipment, particularly relates to high-temperature vacuum sintering processing equipment and method suitable for tantalum insulator preparation, and aims to solve the problems of nonuniform cooling and low efficiency caused by door collision due to mutual correlation errors in multi-source driving of the equipment and difficulty in breaking a heat boundary layer by fixed blowing. The furnace mainly comprises a furnace body, and a furnace pipe is arranged in the furnace body and fixed through a supporting rod. The pushing structure comprises a pushing plate, a driving rod and a transmission shaft, the driving rod is meshed with a worm gear I and a worm gear II, the worm gear I is connected with a rotating shaft to control opening and closing of the furnace cover, and the worm gear II drives a rotating plate and a pin rod through the transmission shaft to enable the pushing plate to move, so that automatic pushing after sintering is achieved, and high-temperature gas damage is avoided; the atmosphere control structure comprises a vacuum pump and a negative pressure pipe for vacuumizing, and a pipe body and a U-shaped gas pipe for injecting argon to form a low-vacuum inert atmosphere; the cooling structure is composed of a U-shaped pipe, a fixing cylinder and a purging assembly. According to the equipment, the operation safety and the sintering efficiency are improved.

The application relates to the technical field of magnetic materials, in particular to a preparation method of high-performance heavy-rare-earth-free neodymium iron boron magnets; the preparation method comprises the following steps: rapidly quenching a main phase alloy into a flake, obtaining coarse powder after hydrogen breaking; immersing the coarse powder in an ethanol mixed solution containing lanthanum nitrate and cerium nitrate, drying the pretreated coarse powder after ultrasonic-magnetic stirring cooperative treatment; adding an antioxidant and a lubricant into the pretreated coarse powder, preparing fine powder with an average particle size of 2-3.5 microns through airflow milling; performing magnetic field orientation compression molding on the fine powder under nitrogen protection, improving the density through cold isostatic pressing; finally, performing vacuum sintering and step-by-step tempering treatment to obtain the high-performance heavy-rare-earth-free neodymium iron boron magnets; wherein the main phase alloy is composed of the following components with mass percentage: 28-31wt.% Pr25Nd75, 0.88-1.2wt.% B, 0-0.1wt.% Al, 0.05-0.3wt.% Ti, 0.05-0.4wt.% Cu, 0.5-1.4wt.% Co, 0.1-0.4wt.% Ga, and the balance is Fe; the prepared neodymium iron boron magnet has the dual characteristics of high coercivity and high remanence, and effectively guarantees the performance and quality.

The present application relates to thin film magnesium battery magnesium-aluminum-cobalt cathode target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with three cobalt tetraoxide and aluminum oxide powder to obtain mixed powder; the mixed powder is put into a ball mill tank and mixed with zirconium oxide balls, then a dispersing agent is added and the mixing and ball milling are continued; then a binder is added to the ball mill tank and the ball milling is continued; the synthesized powder after ball milling is sieved through a 500 mesh sieve, the sieved synthesized powder is weighed and then poured into a vibrating mold, is pressed to form a molded blank; the blank is put into a cold isostatic pressing machine and is pressed and pressure maintained to obtain a cold isostatic pressed magnesium-aluminum-cobalt cathode target material blank; the magnesium-aluminum-cobalt cathode target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, after multi-stage heat preservation and multi-stage cooling, the furnace is naturally cooled to room temperature, and a thin film magnesium battery magnesium-aluminum-cobalt cathode target material is obtained. The composition of the thin film magnesium battery magnesium-aluminum-cobalt cathode target material of the present application is uniform, and the thin film deposition is facilitated.

This invention relates to the field of metal matrix composite material preparation technology, and discloses a method for preparing a bundled vanadium carbide reinforced steel matrix composite material, comprising: immersing vanadium wire in a pretreatment chemical isolation liquid and drying it to form a precursor solid film on the surface; fabricating a preform from the vanadium wire with the solid film on the surface using a three-dimensional orthogonal weaving process; placing the preform in a vacuum sintering furnace and heating it to complete solid-phase pre-alloying; fixing the preform in a mold and preheating it under a protective atmosphere; melting a high-carbon steel matrix material until it is completely liquefied, injecting it into the mold to immerse the preform, and cooling it to obtain a composite preform block; subjecting the composite preform block to in-situ reaction diffusion heat treatment to obtain the composite material. This invention prevents the thermal loss of vanadium wire during liquid casting and, through in-situ diffusion reaction, allows the generated vanadium carbide to inherit the initial weaving morphology, achieving a three-dimensional bundled uniform distribution of the reinforcing phase within the steel matrix.

The invention relates to the technical field of ecological protection engineering, in particular to a tail gas green treatment device of a vacuum sintering furnace. Comprising a support, the support is fixedly connected with a spraying tank, a plurality of spraying modules are fixedly connected in the spraying tank, filler supporting plates with the same number as the spraying modules are fixedly connected in the spraying tank, and two pushing frames are rotationally connected between the filler supporting plates and the corresponding spraying modules in a sealed mode in the spraying tank. The spraying tank is provided with a driving assembly used for driving all the pushing frames to rotate. The two pushing frames at the filler drive the filler to move, in the tail gas treatment stage, the filler moves to continuously change the distribution condition of the filler, the external area is fully utilized, gas-liquid contact and mass transfer are enhanced, the tail gas purification efficiency is remarkably improved, and in the filler cleaning stage, the two pushing frames reversely rotate to generate a strong scrubbing effect on the filler, so that the tail gas purification effect is improved. And external attached impurities are effectively stripped.

The invention discloses a preparation method of a high-porosity aluminum nitride powder precursor, and belongs to the technical field of electronic ceramics, and the preparation method comprises the following steps: S1, raw material mixing: uniformly stirring and mixing water, an aluminum source, a carbon source, aluminum sol and a thickening agent in proportion to form slurry; s2, stirring and foaming: adding a foaming agent into the uniformly mixed slurry in the step S1, and stirring and foaming until the volume of the slurry is increased to 2.5 times or more; s3, injection molding and solidification: adding a curing agent into the foamed slurry in the step S2, continuously stirring, then performing injection molding and solidification on the slurry to obtain an aluminum nitride precursor, and drying to obtain a high-porosity aluminum nitride powder precursor; s4, the dried high-porosity aluminum nitride powder precursor in the step S3 is put into a vacuum sintering furnace to be subjected to a carbon thermal reduction nitridation reaction, and the aluminum nitride powder is obtained.According to the method, the gas replacement circulation effect in the nitridation process can be optimized, the situation that a gas path is blocked due to collapse of precursor blocks is effectively prevented, and then the nitridation reaction stability and the powder quality are guaranteed.

This invention discloses a neodymium iron boron (NdFeB) magnet and its preparation method, belonging to the field of NdFeB technology. The NdFeB magnet comprises a NdFeB alloy and a dopant, wherein the dopant includes WC-Pr-based alloy composite micropowder. The NdFeB alloy is melted, spun into powder, hydrogen-cured, and milled using air jet milling to obtain alloy powder. The alloy powder is then mixed with the dopant and oriented and pressed in a magnetic field. The resulting blank undergoes isostatic pressing, vacuum sintering, and tempering heat treatment to obtain the NdFeB magnet. The WC-Pr-based alloy composite micropowder prepared by ball milling combined with low-temperature diffusion annealing forms a composite structure of a hard WC core and a ductile Pr-based alloy shell. This structure can both utilize the grain boundary pinning and dispersion strengthening effect of WC particles to inhibit abnormal growth of the main phase grains and optimize the distribution and composition of the grain boundary phase with the help of the Pr-based alloy, enhancing grain boundary continuity and ductility. This significantly improves the remanence, coercivity, and maximum energy product of the magnet.

The invention relates to a high-temperature alloy-Ti (C, N) composite metal ceramic material and a preparation method thereof, and belongs to the technical field of metallurgy. The preparation method comprises the following steps that S1, high-temperature alloy powder and Ti (C, N) ceramic powder are subjected to dry grinding, ultrasonic dispersion, wet grinding and drying, and metal ceramic powder is obtained; and S2, the metal ceramic powder is subjected to two-way pressing, vacuum sintering and cooling, and the high-temperature alloy-Ti (C, N) composite metal ceramic material is obtained. The high-temperature alloy-Ti (C, N) composite metal ceramic material prepared by the method has excellent high hardness, obdurability and high-temperature resistance, has outstanding room-temperature and high-temperature mechanical properties, and can meet the strict requirements of extreme working conditions and high-speed cutting on the comprehensive properties of the material.

The invention belongs to the field of preparation of high-performance metal structure materials, and particularly relates to a method for preparing a Ti2AlNb alloy based on spherical titanium alloy powder. Commercial spherical titanium alloy pre-alloyed powder containing at least two elements of Al, Zr, Mo and V and pure niobium powder are selected as base materials, the spherical powder, the pure niobium powder and pure aluminum powder are evenly mixed according to the designed atomic proportion, a densification path of vacuum sintering or spark plasma sintering after cold isostatic pressing is adopted for preparing a consumable electrode blank, and the consumable electrode blank is prepared into a self-consumable electrode. And finally, a Ti2AlNb-based alloy cast ingot is obtained through vacuum self-consuming electric arc melting. According to the invention, not only is the technical bottleneck of inevitable gravity segregation in the smelting process of the Ti-Al intermetallic compound with high Nb content broken through, but also a brand new material preparation technical route with low cost, high performance and high stability is constructed; an industrialization feasible scheme is provided for solving the bottleneck problem of short-time high-temperature light structural materials in the aerospace field.

This invention belongs to the field of cardiac stent technology, specifically relating to a cobalt-chromium MP35N implantable tube for cardiac stents and its preparation method. The preparation method includes the following steps: raw material preparation and pretreatment, cold isostatic pressing, sintering and densification, multi-directional alternating deformation and tissue regulation, and finishing and shaping treatment to obtain the cobalt-chromium MP35N implantable tube for cardiac stents. This invention constructs a low-impurity, fully dense homogeneous tube blank substrate through cold isostatic pressing, vacuum sintering, hot isostatic pressing, and multi-directional alternating deformation, reducing the risk of subsequent cracking. The multi-directional alternating deformation, through alternating stress of axial tension and radial rotary forging, breaks the directional grain arrangement, and combined with gradient recrystallization heat treatment, ultimately obtains an ultrafine-grained, isotropic structure with both high strength and good toughness.

The invention discloses a preparation method of a composite stacked abrasive grinding wheel for thinning a silicon carbide wafer, which comprises the following steps: uniformly mixing a diamond abrasive, a soft abrasive and a first ceramic bond according to a first mass ratio to obtain a mixed dry material; uniformly mixing the mixed dry material with a thickening agent, a dispersing agent and purified water according to a second mass ratio to obtain slurry; continuously and uniformly mixing the slurry, granulating, drying and sintering to obtain a composite stacked abrasive material; preparing a forming material based on the composite stacked abrasive, a second ceramic bond, a pore forming agent and a wetting agent; carrying out cold press molding on the molding material and then carrying out vacuum sintering to obtain the grinding wheel grinding block; and the composite stacked abrasive grinding wheel can be obtained by adhering the grinding wheel grinding block to the grinding wheel base body. The composite stacking abrasive grinding wheel prepared according to the method is better in self-sharpening performance and lower in machining energy consumption, the grinding machining stability is improved, and meanwhile the quality of a machined wafer is improved.

This invention discloses an antioxidant porous TiAl alloy, the raw materials of which include: a mixed powder, nano-B4C, nano-NiO, and nano-SiO2. The mixed powder comprises TiH2 powder and aluminum powder; the Ti content in the mixed powder is 51-53 wt%; the weight ratio of nano-B4C, nano-NiO, and nano-SiO2 to the mixed powder is 2-3:0.5-1.5:2-3:100. This invention also discloses a method for preparing the above-mentioned antioxidant porous TiAl alloy, comprising the following steps: mixing TiH2 powder and aluminum powder to obtain a mixed powder, then adding nano-B4C, nano-NiO, and nano-SiO2 and mixing, pressing into shape, vacuum sintering, soaking in an alkaline solution, and washing with water to obtain the antioxidant porous TiAl alloy. This invention also discloses the application of the above-mentioned antioxidant porous TiAl alloy in filtering high-temperature flue gas. This invention exhibits excellent antioxidant and filtration performance.

The invention relates to the technical field of composite material preparation, in particular to an efficient preparation process of a continuous fiber reinforced silicon carbide ceramic matrix composite material, which comprises the following steps: selecting silicon carbide powder and phenolic resin powder, putting into a sodium carboxymethyl cellulose aqueous solution, and stirring; in the stirring process, a non-uniform index is obtained according to the change condition of the pixel reflectivity in the hyperspectral image of the mixed slurry, and then the local distribution difference degree is obtained; the method comprises the following steps: acquiring a particle aggregation characterization value at each moment based on fluctuation of a local distribution difference degree, calculating a stirring effective degree to control a stirring speed, putting continuous carbon fiber plain cloth into resin matrix slurry, dipping, drying and curing to obtain a resin matrix composite material biscuit, and carbonizing to obtain the continuous fiber reinforced porous carbon matrix composite material. And putting the mixture into a vacuum sintering furnace for melt siliconizing treatment to obtain the continuous fiber reinforced silicon carbide ceramic matrix composite material. The compact uniformity of the continuous fiber reinforced silicon carbide ceramic-based composite material is improved.

The application provides a fine high ring anti-cracking sintering method through laser selective pre-strengthening, which comprises the following steps: firstly, pressing powder for preparing a fine high ring into a green body with a fine high ring shape; then, strengthening the green body through laser scanning under an argon protective atmosphere; firstly, scanning the inner and outer edges of the lower port and the upper port of the green body and scanning a plurality of elementary line regions uniformly distributed in the circumferential direction of the inner wall curved surface of the green body in the axial direction by using point laser scanning, so that the green body powder is micro-melted and rapidly cooled to form a strengthened ring and a plurality of reinforcing ribs; then, scanning the inner wall curved surface and the outer wall curved surface of the green body by using line laser scanning, and the scanning intensity and the scanning temperature of the line laser are both lower than those of the point laser; finally, gradient sintering the green body by using a vacuum sintering furnace, and the sintering density temperature is higher than the scanning temperature of the point laser, and argon is used for atmosphere protection during sintering. The application strengthens the structural strength of the fine high ring green body through laser pre-strengthening, reduces the cracking problem of the fine high ring during sintering, and improves the yield of the fine high ring.

The invention discloses a preparation method of an aluminosilicate-MgO-YSZ quaternary composite ceramic material, and the preparation method comprises the following steps: 1) according to formula requirements, after Al2O3, SiO2, MgO and YSZ are preliminarily mixed, a wet ball milling process is adopted for ultrafine treatment, and mixed slurry is obtained; (2) carrying out spray granulation on the ball-milled mixed slurry, and preparing a corresponding molded blank by adopting an isostatic pressing molding process; 3) placing the molded blank in a vacuum sintering furnace, and sintering by step heating to obtain a sintered body; and 4) carrying out gradient cooling treatment on the sintered body to obtain the composite ceramic material. According to the preparation method provided by the invention, the aluminosilicate-MgO-YSZ quaternary composite ceramic material which is low in production cost and has intrinsic high whiteness and high strength characteristics is prepared by limiting the mass ratio of MgO / YSZ and limiting the molar ratio of Al / Si, combining a stepped sintering process in a sintering process and finally performing a gradient cooling process.

The utility model relates to sealing connecting device technical field especially relates to a kind of vacuum sintering furnace sealing connecting device.Its technical scheme includes furnace body, rotates and installs on the cover of furnace body, further include cooling cavity being located on the cover, sealing body being fixedly installed in cooling cavity, the flow-through groove being equipped with in sealing body and cooling cavity intercommunication, input pipe and output pipe being fixedly installed on the cover and with cooling cavity intercommunication, hydraulic balance component being installed on the cover, the hydraulic balance component includes the detection cylinder being fixedly installed on the cover and with cooling cavity intercommunication, detection plate being slidably installed in the detection cylinder and moving according to the hydraulic pressure size inside cooling cavity.The utility model is directly contacted with the design of sealing body by water cooling device, cooling liquid and sealing body high-efficiency heat exchange, rapidly export high-temperature heat load, strictly control sealing interface temperature in material tolerance threshold, completely avoid rubber carbonization, metal creep and other thermal failure.

The preparation method comprises the following steps: S1, high-abundance boric acid, an organic carbon source and polytetrafluoroethylene are uniformly mixed according to a certain ratio, and the ratio of the high-abundance boric acid to the organic carbon source to the polytetrafluoroethylene is (5-8): 1: (0.05-0.2); s2, the raw materials in the S1 are subjected to a carbon thermal reduction reaction in a vacuum sintering furnace at the high temperature, and the high-abundance boron carbide powder is prepared. According to the technical scheme, the near-spherical superfine high-abundance boron carbide powder can be prepared, the raw material utilization rate is high, and the near-spherical superfine high-abundance boron carbide powder can be directly used as a superfine powder raw material for a subsequent sintering process.

The invention discloses a preparation method and application of a high-dispersity alcohol-based binder based on lanthanum hexaboride, and belongs to the technical field of titanium alloy additive manufacturing. The binder is composed of the following substances. The coating is prepared from lanthanum hexaboride nanoparticles, PVP, isopropanol, glycerol and deionized water. A suspension system with the particle size D90 smaller than or equal to 500 nm and stable rheological property is prepared through powder drying pretreatment, PVP-isopropanol solution wetting and coating, ultrasonic pre-dispersion and wet high-energy ball milling, the viscosity and surface tension reach 7.23 mPa.s and 29.0 mN / m respectively by regulating and controlling the content of water and glycerin, the requirement for the sprayability of a sprayer is met, and meanwhile long-term stable storage can be achieved. The binder can uniformly wet the surface of TC4 powder along with liquid drops in the forming process, weaken oxygen hazards in the degreasing and vacuum sintering stages, generate precipitated phases such as TiB in situ, refine grains and perform dispersion strengthening, so that the density and comprehensive mechanical properties of a component are improved, and collaborative optimization of toughening, strengthening and oxidation resistance in the titanium alloy binder spray forming process is achieved.

A platinum-based composite material with low residual gas content and a preparation method thereof belong to the technical field of platinum-based composite materials, and the preparation method comprises the following steps: S1. Pt, Zr and Y pure metal raw materials are subjected to smelting under vacuum conditions, and then Pt-Zr-Y alloy ingots are obtained by pouring; S2. The Pt-Zr-Y alloy ingots prepared in S1 are made into alloy particles, and the alloy particles are made into alloy powder; S3. The alloy powder prepared in S2 is soaked in high-purity water, then hydrogen peroxide solution is added for activation, and the mixture is sealed and placed for a period of time, then anhydrous ethanol is added and stirred uniformly, and then dried to obtain pre-prepared alloy powder; S4. The pre-prepared alloy powder prepared in S3 is placed in a pure oxygen atmosphere for heating and heat preservation oxidation treatment to obtain oxidized pre-prepared alloy powder; S5. The oxidized pre-prepared alloy powder prepared in S4 is subjected to vacuum sintering treatment to obtain a platinum-based composite material blank; and S6. The platinum-based composite material blank prepared in S5 is subjected to vacuum hot pressing treatment to obtain a platinum-based composite material.

The invention relates to the technical field of rare earth permanent magnet material preparation, and discloses a grain boundary regulation type high-abundance lanthanum-cerium-iron-boron permanent magnet and a preparation method, the permanent magnet is prepared from a lanthanum-cerium-iron-boron rapid-hardening casting sheet and modified prefabricated powder, and the modified prefabricated powder is obtained by premixing neodymium iron boron waste powder, a rare earth modifier and an organic anchoring agent. The preparation method comprises the following steps: carrying out layered charging on raw materials, carrying out hydrogen absorption saturation, heating dehydrogenation and inert gas purging, then pulverizing and molding, and finally carrying out two-stage vacuum sintering and two-stage aging treatment to obtain the grain boundary regulation type high-abundance lanthanum cerium iron boron permanent magnet. According to the method, the rare earth modifier is fixed on the surface of the waste powder through the organic anchoring agent, and the layered charging and low-temperature solid-phase reaction process is matched, so that organic volatile components are effectively removed, and meanwhile, a heavy rare earth-rich shell structure is constructed by using a waste powder oxidation layer. According to the technology, high-valued utilization of the neodymium iron boron waste powder is achieved, heavy rare earth is inhibited from diffusing to a main phase, and the coercive force and residual magnetism of the high-abundance lanthanum-cerium magnet are improved.

The invention relates to the technical field of vacuum sintering, and provides an infrared temperature measurement method for a formic acid vacuum furnace, which comprises the following steps: a jig is arranged in the formic acid vacuum furnace, an upper heating pipe and a lower heating pipe of the formic acid vacuum furnace are infrared radiation heating pipes, the jig is of a hollow structure, a workpiece to be measured is placed on the jig, and an upper cover of the vacuum furnace is provided with a plurality of temperature measurement components; a temperature measuring seat of the temperature measuring assembly is provided with an infrared temperature measuring sensor, and the infrared temperature measuring sensor measures temperature through a temperature measuring window; acquiring a plurality of first measurement temperature data; comparing the first measured temperature data with each other, and re-measuring if the first measured temperature data is greater than a threshold value; if so, averaging the first measured temperature data to obtain second measured temperature data; determining a temperature interval according to the second measured temperature data; determining an infrared radiation response value according to the temperature interval; and determining third measurement temperature data according to the infrared radiation response value and a temperature determination formula. The problem that an existing formic acid vacuum furnace is low in infrared temperature measurement precision is solved.

This invention provides a method for preparing high-purity tantalum powder for semiconductors, comprising the following steps: (1) adding potassium fluorotantalate into the inner liner of a double cone furnace, evacuating the vacuum, heating to 280-400°C, and holding for 4-8 hours to activate the potassium fluorotantalate; (2) loading the activated potassium fluorotantalate and diluent obtained in step (1) into a reduction vessel, introducing argon gas to replace the air, heating to 800-900°C to begin sodium injection, and after sodium injection, holding for aging for 0.5-2 hours, and allowing to cool to room temperature to obtain the reactant; (3) washing the reactant obtained in step (2) with water and acid, then washing with pure water until neutral, and drying to obtain a semi-finished product; (4) placing the semi-finished product obtained in step (3) in a vacuum sintering furnace for high-temperature sintering to obtain a tantalum sintered block, crushing the tantalum sintered block with a crusher, and then sieving it with a vibrating sieve to obtain high-purity tantalum powder for semiconductors. The high-purity tantalum powder obtained by this invention can meet the technical requirements of semiconductor sputtering targets.