222results about How to "Reduce oxygen content" patented technology

The invention discloses active brazing filler metal for sealing sapphire and kovar alloy and a preparation method of the active brazing filler metal. The active brazing filler metal comprises 25.0 wt%-27.5 wt% of Cu, 1.0 wt%-6.0 wt% of Ti, 1.0 wt%-5.0 wt% of Al, 0.1 wt%-1.0 wt% of B, 0.1 wt%-0.5 wt% of rare earth element RE, RE is one or more of La, Ce, Sc, Pr, Nd and Er, and the balance is Ag. The preparation method comprises the following steps: preparing silver-based pre-alloying powder by adopting a gas atomization method, mixing the alloy powder with additive element powder in a ball milling manner, sintering by utilizing vacuum pressure to obtain an alloy ingot blank, and carrying out rough rolling, intermediate annealing and finish rolling to obtain an active brazing filler metal strip with the thickness of 0.05-0.2 mm. The active brazing filler metal is well matched with the thermal expansion coefficient of sapphire, direct brazing of sapphire and Kovar alloy can be achieved, the brazing temperature is moderate, and a brazed joint is uniform in structure and free of defects such as air holes and cracks.

The invention provides a lignite-based supercapacitor activated carbon electrode material and a preparation method thereof, and belongs to the technical field of electrochemical power supply material preparation. The preparation method comprises the following steps: S1, performing hydrochloric acid pickling on lignite raw coal powder for X2 hours, performing hydrofluoric acid pickling for X2 hours, and heating a calcium phosphate solution for deoxidation to obtain pretreated lignite; s2, uniformly stirring and mixing the pretreated lignite, an alkaline activator and deionized water according to the mass ratio of 1: X4: (5-10) to obtain a mixture; s3, activation is conducted, the activation temperature is X1 DEG C, and the activation time is X3 h; cooling to obtain a roasted product; s4, acid pickling with diluted hydrochloric acid; the specific capacitance of the active carbon electrode material is Y F / g, wherein Y = a + b * X1 + c * X2 + d * X3 + e * X4-f * X1 * X2 + g * X1 * X3 + h * X1 * X4 + i * X2 * X3 + j * X2 * X4 + k * X3 * X4-l * X12-m * X22-n * X32-o * X42. The preparation method is simple, the cost is low, the process repeatability is good, the prepared porous carbon has a high specific surface area, and the power density and the cycling stability of the supercapacitor are improved.

The invention relates to the technical field of circuit substrate manufacturing, and particularly discloses a preparation method of a composite solder sheet and an AMB ceramic copper-clad plate. The composite solder sheet is composed of an active metal foil and a copper-containing layer modified on the surface of the active metal foil, and the preparation method of the copper-clad plate comprises the following steps: after the surface of the active metal foil is pretreated, the copper-containing layer is deposited to prepare the composite solder sheet, and the composite solder sheet is placed between a copper substrate and a ceramic sheet to be pressed and assembled. And performing vacuum brazing on the assembly to complete the preparation of the ceramic copper-clad plate. A composite solder sheet containing active metal is adopted, high-temperature element diffusion during vacuum brazing is utilized at the diffusion temperature to achieve alloying of a composite solder layer, and then heat preservation is conducted at the brazing temperature to achieve uniform melting of solder and wetting metallurgical reaction between the solder and copper and between the solder and a ceramic substrate. By means of the preparation method, low-cost and high-reliability preparation of the AMB ceramic copper-clad plate can be achieved, and the prepared AMB ceramic copper-clad plate also has high peel strength and lower weld porosity.

The invention relates to a TBC battery and a preparation method thereof. The preparation method comprises the following steps: S1, forming a dielectric region and a polycrystalline silicon layer; s2, forming a dopant source layer of the first conductive type impurities; s3, opening the film and cleaning; s4, one-step co-doping of impurities of different conductive types; the thickness of the dopant source layer of the first conductive type impurities is 10 nm to 100 nm. According to the invention, the dopant source layer of the first conductive type impurities is formed firstly, so that the high-temperature doping times, the cleaning times and the film opening times are reduced, the doping temperature is reduced, the process time is shortened, the process flow is simplified, the equipment investment cost is reduced, and the internal composite action of the cell is reduced, thereby improving the photoelectric conversion efficiency.

The invention belongs to the technical field of additive manufacturing, and relates to a low-density high-entropy alloy high-energy beam additive forming method. The method comprises the following steps: smelting an alloy; alloy crushing; ball-milling the powder; spheroidizing the powder; preparing a sample; heat treatment; and sample structure performance detection. The low-density high-entropy alloy sample prepared through high-temperature vacuum suspension smelting and plasma spheroidizing is high in room-temperature compression strength which exceeds 2300 MPa, the ductility exceeds 20%, the compression strength at the temperature of 1000 DEG C exceeds 780 MPa, meanwhile, the low-density high-entropy alloy powder manufacturing problem is solved, and the low-density high-entropy alloy powder manufacturing method is suitable for industrial production. The method has the advantages of good sphericity, good fluidity, uniform components, no hollow powder or satellite powder, low oxygen content and the like, and provides a powerful basis for promoting the application of high-temperature alloy structure new materials in the aerospace field.

The invention belongs to the technical field of titanium-based thin-wall component machining, and discloses a method for machining a high-temperature-resistant titanium-based thin-wall component through cold spraying additive-hot pressing and the like. A titanium-based layered gradient structure prefabricated blank is prepared mainly through a cold spraying method, and machining of the high-performance and high-temperature-resistant titanium-based thin-wall component is achieved in combination with a subsequent equal material technology. The processing and preparing process comprises the steps that the component content of the titanium-based composite powder is determined; preparing composite powder; carrying out cold spraying additive printing to obtain a layered gradient preformed thin-wall blank; and carrying out reaction hot pressing to form the high-temperature-resistant thin-wall component. By means of the method, high-production-efficiency, low-cost and high-performance manufacturing of the high-temperature-resistant layered gradient titanium-based composite material or the titanium-aluminum intermetallic compound thin-wall component can be achieved; the high-temperature-resistant thin-wall component with the maximum service temperature of 800 DEG C can be machined and prepared according to the target service temperature requirement, and customization of the service performance can be achieved according to the mechanical property requirement of the component.

The invention discloses a method and a device for preparing an oxygen-free copper pipe from regenerated copper, a corrosion-resistant copper pipe and a casting process, and belongs to the field of copper treatment, and the corrosion-resistant copper pipe has the oxygen element content of less than 5 ppm, the hydrogen element content of less than 0.3 ppm, the phosphorus element content of 0.1-0.3% and the balance of copper element; the method for preparing the oxygen-free copper pipe through the regenerated copper comprises the steps that S1, molten copper in a shaft furnace is heated to the set temperature, the concentration of reducing gas in the shaft furnace is adjusted, the oxygen element content of the molten copper in the shaft furnace is increased to be larger than 30 ppm, and primary impurity removal is conducted; s2, the molten copper in the shaft furnace is sequentially introduced into a chute, a refining furnace, a standing furnace and a casting furnace, the temperature of the molten copper in the chute, the refining furnace, the standing furnace and the casting furnace is gradually decreased, inert gas and reducing gas are introduced into the chute, the refining furnace, the standing furnace and the casting furnace, and the flow and pressure of the inert gas and reducing gas introduced into the chute, the refining furnace, the standing furnace and the casting furnace are gradually decreased; and performing secondary impurity removal. The method is mainly used for preparing the oxygen-free copper pipe through the regenerated copper and preparing the corrosion-resistant copper pipe.

The invention belongs to the technical field of secondary ion batteries, and discloses a preparation method of a Prussian blue compound, which comprises the following steps: by taking sodium cyanide as a cyanide complexing agent and divalent manganese salt as a central complexing ion, carrying out coprecipitation reaction in an aqueous solution reaction system under the protection of an inert atmosphere and a reducing agent to prepare the Prussian blue compound NaxMn [Mn (CN) 6] y-1-y.nH2O. The Prussian blue compound prepared by the method can be used as an organic sodium ion battery positive electrode material or an aqueous sodium ion battery negative electrode material, and shows excellent electrochemical performance.

The invention relates to the technical field of rubber, and discloses low-temperature-resistant rare earth butadiene rubber and a preparation method thereof. Phosphorus-containing quaternary ammonium salt modified polyurethane, polyethoxylene ether modified phenolic resin, rare earth butadiene rubber and sulfur are added into an internal mixer to be mixed and then vulcanized, and the low-temperature-resistant rare earth butadiene rubber is obtained. In the phosphorus-containing quaternary ammonium salt modified polyurethane, silicon-oxygen bonds enable the rubber to maintain stability at low temperature, so that the low-temperature-resistant effect of the rubber is improved; polyurethane and a rubber molecular chain form an interpenetrating polymer network, so that the mechanical property of the rubber is improved; due to the soft segment chain of polyurethane, the rubber has better toughness at low temperature, and the low temperature resistance of the rubber is improved; an ether bond in polyoxyethylene ether has flexibility and stability, so that the rubber is not easy to crystallize or cure at low temperature; phosphorus, silicon and sulfur elements are used together to generate a synergistic flame-retardant effect, so that the flame retardance of the rubber is improved; the phenolic resin plays a reinforcing role in the rubber, so that the mechanical property of the rubber is improved.

The invention discloses a method for preparing titanium-aluminum alloy powder based on a plasma rotating electrode atomization method, and relates to a preparation method of titanium-aluminum alloy powder. The method aims at solving the technical problems that titanium-aluminum alloy powder prepared through an existing method is uneven in particle size, poor in sphericity degree and high in oxygen content, and comprises the steps that firstly, metal raw materials are weighed according to the target titanium-aluminum alloy chemical component proportion, and a uniform cast ingot is obtained through smelting of a vacuum arc smelting furnace; processing the cast ingot into an electrode bar with a smooth surface, mounting the electrode bar on plasma rotating electrode atomization equipment, enabling the electrode bar to rotate at a high speed, melting alloy at the end part of the electrode bar by utilizing a plasma beam generated by a plasma generator, atomizing the alloy into liquid drops under the action of centrifugal force, and cooling and solidifying the liquid drops in a high-purity argon protection atmosphere to form powder; and finally, the powder is collected and screened, finished powder is obtained, the sphericity degree of the powder reaches 95% or above, the oxygen content is lower than 500 ppm, particle size distribution is uniform, and the powder can be used in the fields of aerospace, the automobile industry, energy and the like.

The utility model relates to a vibrating MBR membrane device and a vibrating MBR membrane sewage treatment system, which are characterized in that the vibrating MBR membrane sewage treatment system comprises an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank and a clear water tank which are sequentially arranged according to a water flow sequence, the anaerobic tank is provided with a water inlet, the clear water tank is provided with a clear water discharge pipe, and the anoxic tank is provided with a water outlet. A vibrating MBR membrane device is arranged in the MBR membrane tank and comprises a rack, a moving frame which is erected at the top of the rack and slides along the rack, an MBR membrane assembly arranged on the moving frame and a crankshaft driving mechanism for driving the moving frame to do reciprocating linear motion. And the MBR membrane tank is also communicated with the anoxic tank through a steam stripping return pipe, and the anoxic tank is communicated with the anaerobic tank through a steam stripping return pipe. According to the utility model, not only is the sewage treatment effect greatly improved, but also the service life of the MBR membrane is prolonged, and the energy consumption is saved.

The invention discloses a ceramic heat sink material and a preparation method thereof, and the preparation method comprises the following steps: S1, taking a Si-Al alloy ingot, porous C-Si3N4 and a sintering aid as raw materials, and carrying out pre-sintering to obtain a compound; and S2, carrying out spark plasma sintering treatment on the compound in a vacuum atmosphere to obtain the ceramic heat sink material, according to the preparation method, the Si-Al alloy ingot and the porous C-Si3N4 are taken as raw materials, the Si-Al alloy ingot permeates into the porous C-Si3N4 material under the heating melting condition, the composite AlN-SiC ceramic material which is uniform in phase distribution and compact is formed in situ in combination with the sintering aid, the obtained ceramic heat sink material is large in crystal grain and small in number of crystal boundaries, scattering of phonons is reduced during heat conduction, and the heat sink material has the advantages of being high in heat sink efficiency and good in heat sink performance. The heat conductivity is improved; meanwhile, the prepared ceramic heat sink material is high in grain density and uniformity, low in oxygen content in crystal lattices and moderate in impurity-phase silicon content, so that the heat conductivity is high, and the ceramic heat sink material is suitable for being used as a heat sink ceramic substrate.

The invention relates to the field of fireproof cables, and discloses a composite mica copper sheathed high-performance fireproof cable for high-speed railways. The composite mica copper sheathed high-performance fireproof cable comprises a plurality of insulating cores, an inorganic tape, a copper sheath, and a sheath layer which are sequentially arranged from the inside to the outside, wherein the insulating core comprises a copper conductor and a mica tape insulation layer wrapped around the surface of the copper conductor, and a mineral material is filled between the mica tape insulation layer and the inorganic tape; the sheath layer is prepared by pulling out a sheath layer material from the outer periphery of the copper sheath through an extrusion device; the sheath layer material comprises the following raw materials in parts by weight: 70 to 90 parts of low-density polyethylene, 10 to 15 parts of ethylene-tetrafluoroethylene copolymer, 5 to 10 parts of modified composite fillers, 2 to 5 parts of flame retardant additives, 3 to 4 parts of diisopropylbenzene peroxide, 2 to 2.5 parts of triallyl isocyanurate, 1 to 2 parts of a plasticizer, and 0.1 to 0.3 parts of a lubricant. The invention imparts excellent heat-oxidation aging resistance, flame retardancy, and heat resistance to the cable sheath layer material through the addition of the modified composite filler and the flame retardant additive.

The invention discloses a high-strength steel smelting method for improving the purity of molten steel, which comprises the following steps: (1) carrying out composite desulfurization on lime and magnesium powder in a desulfurization station, and then removing slag to ensure that the sulfur in the back of a converter is less than 150ppm; (2) carrying out desulfurization on the LF by adopting lime and an aluminum deoxidizer until the desulfurization is 20-40ppm; (3) after the molten steel begins to circulate in the RH vacuum chamber, aluminum is added according to the predicted oxygen blowing amount, and oxygen blowing operation is carried out after aluminum adding is finished and stabilization is carried out; (4) 140 + / -10 m seamless pure calcium core-spun yarn is fed, and molten steel is statically stirred for 15-20 min after calcium treatment; (5) performing protective casting during continuous casting, and completely eradicating air suction; and (6) a strong secondary cooling water process is adopted for the thick plate continuous casting billet to accelerate dendritic crystal nucleation in the continuous casting billet, and when the solid-liquid phase rate of the continuous casting billet ranges from 0.2 to 1.0, the center segregation of the continuous casting billet is guaranteed under the heavy pressure of 12 mm. The method has the advantages of improving the purity of the molten steel and improving the center segregation of the continuous casting billet.

A process for preparing 5N-grade ultrapure iron from industrial pure iron is characterized in that 3N-grade industrial pure iron is adopted as an anode to obtain 4N-grade high-purity iron through primary electrolysis, the 4N-grade high-purity iron obtained through primary electrolysis is adopted as an anode to continue secondary electrolysis, pure iron obtained through secondary electrolysis is subjected to tertiary electrolysis or multiple times of electrolysis, and 5N-grade ultrapure iron is obtained. And removing free-state and combined-state gas elements in the pure iron subjected to three times of electrolysis or multiple times of electrolysis by utilizing a rotary vacuum drying furnace and a rotary reduction furnace matched with a proper process, so as to prepare the ultrapure iron with the purity of 5N grade. The method disclosed by the invention has the advantages that industrial pure iron is used as a raw material to be electrolyzed for many times to reduce the content of near iron elements such as Co, Ni, Cu and Zn, and a rotary drying furnace and an atmosphere reduction furnace are matched with a proper process to reduce free-state and combined-state gas elements in electrolytic iron; the preparation of 5N-grade ultrapure iron with low near iron element, low oxygen content and low cost is realized by combining three steps of electrolysis, drying and reduction.

The invention provides a quartz crucible for continuously drawing crystalline silicon and a preparation method of the quartz crucible, and belongs to the technical field of crucible manufacturing. Comprising the following steps: S1, performing electric arc melting on quartz sand to obtain a blank quartz crucible with a smooth inner surface and a rough outer surface; s2, the blank quartz crucible is sequentially subjected to outer surface sand blasting, outer surface grinding, height cutting, first cleaning, outer surface fire machining polishing, second cleaning and drying procedures, and the inner surface roughness Rlt is obtained; the thickness is 5 microns, and the roughness of the outer surface is Ralt; the invention discloses a 5-micron quartz crucible. Therefore, the quartz crucible can reduce oxygen brought into silicon liquid in the process of drawing crystalline silicon, the oxygen content of the crystalline silicon is reduced, and the quality of the crystalline silicon is improved.

The invention relates to chopped fiber toughened high-entropy carbide ceramic used in an ultrahigh-temperature extreme environment as well as a preparation method and application thereof. The chopped fiber toughened high-entropy carbide ceramic comprises chopped fibers with the volume fraction of 5%-20%, and a matrix is high-entropy carbide. The high-entropy carbide is toughened by adopting the chopped fibers, the SiC, W and C fibers all have the advantages of good high-temperature resistance, excellent mechanical properties and the like, and the chopped fiber form can ensure that the preparation process is simple and convenient, the toughening effect is relatively good, and anisotropy of performance and the like do not exist; the chopped fiber toughened high-entropy carbide ceramic prepared by the invention can reach about 9.9446 MPa.m <-1 > / 2, and has excellent mechanical properties.

The invention discloses a Czochralski monocrystalline silicon thermal field thermal insulation cylinder, which belongs to the technical field of monocrystalline silicon production, and comprises an upper cylinder body and a lower cylinder body, the inner diameter of the upper barrel is larger than that of the lower barrel, and steps at the inner joint of the upper barrel and the lower barrel are streamlined. The upper end and the lower end of the inner wall of the heat preservation cylinder form rounding oblique angles; a plurality of diversion trenches are formed in the inner wall of the heat preservation cylinder from the upper end to the lower end. The invention can effectively solve the problems of low thermal utilization efficiency of the existing monocrystalline silicon thermal field, pollution of returned gas to silicon liquid, difficult crystallization caused by high oxygen content in crystals and the like.

The utility model discloses a comprehensive utilization system for tablet vanadium calcining flue gas, which is characterized in that a first regulating valve is arranged on a flue gas pipeline between a chimney I and an induced draft fan I, a calcining flue gas return main pipe is arranged on the flue gas pipeline, and the calcining flue gas return main pipe is divided into four branch pipes. According to the comprehensive utilization system, the tablet vanadium three-step method calcination flue gas is led back to be supplied to the melting furnace and the calcination flue gas furnace for low-oxygen gas combustion and supplied to the calcination flue gas furnace and the flash evaporation drying machine for low-temperature flue gas mixing, and the purposes of saving energy of a production line and reducing the oxygen content of the system are achieved. In addition, after tablet vanadium is calcined through a three-step method, ammonia-containing flue gas is led back to be used as a low-oxygen combustion-supporting body for combustion of a melting furnace and a calcination flue gas furnace, ammonia gas is decomposed into hydrogen and nitrogen, and pollution-free water vapor is generated after hydrogen is combusted. The problems of ammonia emission pollution and treatment are successfully solved, the investment and operation cost of the whole system is reduced, and meanwhile fuel consumption is reduced.

The invention provides a preparation method of micro low-oxygen spherical TiAl alloy powder, and relates to the technical field of spherical titanium-based alloy powder. The preparation method comprises the steps of raw material selection and treatment of a wire material, preparation of a TiAl composite wire, preparation of a TiAl alloy wire, treatment of the TiAl alloy wire, establishment of a gas system, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation which are sequentially carried out. According to the method, through multiple wire twisting, multiple continuous hot drawing, diffusion homogenization annealing, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation, the TiAl alloy wire with the evenly-distributed components can be directly prepared at the low temperature, then the TiAl alloy fine powder with the low oxygen content and the evenly-distributed components is prepared, the TiAl alloy fine powder is suitable for additive manufacturing, and the method is suitable for being used for additive manufacturing. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.

The invention discloses a high-purity oxygen-free copper material and a preparation process thereof, and relates to the technical field of metallurgy, and the preparation process comprises the following steps: step S1, electrolytic purification; step S2, performing pretreatment; s3, smelting and casting; an electrolyte used for electrolytic purification takes deionized water as a solvent, and comprises the following components in concentration: 60 to 120 g / L of copper nitrate, 50 to 80 g / L of sulfuric acid, 20 ppm of hydroxypropyl-beta-cyclodextrin, 1 to 6 mg / L of tris (hydroxymethyl) methylglycine, 0.5 to 5 mg / L of melamine, 5 to 20 mg / L of a surfactant, and 0.1 to 3 mg / L of 1-benzyl pyridinium onium 3-carboxylate. The high-purity oxygen-free copper material disclosed by the invention is high in purity, low in oxygen content and stable.

The invention discloses a filter pressing circulation system for preparing low-oxygen iron-nickel alloy powder and a preparation method. The system comprises an atomization bin, and a tundish leakage ladle and an atomization spraying disc are arranged at the top of the atomization bin; the bottom of the atomization bin communicates with a filter pressing tank, and the position, close to the bottom, of the filter pressing tank communicates with the interior of the atomization bin through a pipeline; one side of the atomization bin is connected to a sedimentation tank, and a magnetic trapping unit is arranged in the sedimentation tank. The method comprises the steps that iron and nickel are weighed and smelted, and an alloy additive and a slag former are added into a molten solution; heating the solution, cooling, standing, and removing slag; the alloy solution obtained after slag fishing is heated again, and the alloy solution is atomized into iron-nickel alloy catalyst powder through an atomization spraying disc in the argon environment; and finally, the iron-nickel alloy catalyst powder collected in the filter pressing tank and captured by an electromagnet is subjected to roasting reduction in a hydrogen environment, drying and screening, and the low-oxygen iron-nickel alloy powder is obtained. The problem that in the prior art, the oxygen content of the touch coal powder prepared through water atomization is high is solved.

The invention discloses an aluminum-scandium alloy and a preparation method and application thereof, and belongs to the technical field of rare earth alloy sputtering target materials, metal aluminum particles and metal scandium particles are used as raw materials, high vacuum is extracted, inert gas is introduced for multiple times of electric arc melting, aluminum-scandium alloy melt with uniform components is obtained, and after the aluminum-scandium alloy melt is cooled, the aluminum-scandium alloy is obtained. The method comprises the following steps: preparing an aluminum-scandium alloy ingot, carrying out induction heating on the aluminum-scandium alloy ingot prepared by electric arc melting to completely melt the alloy so as to obtain an alloy melt, guiding the alloy melt to be injected into a mold through an argon pressure difference, naturally cooling to form a primary alloy, and carrying out homogenizing annealing on the primary alloy under a vacuum condition to obtain the aluminum-scandium alloy. And eliminating the residual internal stress of the primary alloy to obtain the aluminum-scandium alloy. The aluminum-scandium alloy prepared through the method is low in oxygen content, high in density, fine in crystal grain, uniform in structure and good in machining performance.

The utility model discloses a pest control device and system for a production workshop line pipe, and belongs to the technical field of pest control. The nitrogen filling device comprises a plugging assembly and a nitrogen filling assembly, the plugging assembly comprises an expandable expansion and contraction piece, and the expansion and contraction piece is movably inserted into a connector of a wire pipe; the expansion and contraction piece has a contraction state and an expansion state, in the contraction state, the expansion and contraction piece is in clearance fit connection with the inner wall of the connector, and in the expansion state, the expansion and contraction piece is in interference fit connection with the inner wall of the connector; the nitrogen charging assembly comprises a nitrogen charging piece capable of being connected and disconnected, the nitrogen charging piece is arranged in the expansion and contraction piece in a penetrating mode and connected with the expansion and contraction piece in a sealed mode, and the nitrogen charging piece can supplement nitrogen into the line pipe so as to repel and kill pests. According to the utility model, the aim of killing insects in the pipeline can be fulfilled without transforming the existing line pipe.

The invention relates to a method for preparing metallic titanium through two-step electrolysis in halide molten salt, and belongs to the technical field of metallurgy. The method comprises the following steps: by taking fluorine-chloride mixed molten salt as primary electrolytic molten salt, adding TiO2 into the fluorine-chloride mixed molten salt, uniformly mixing, heating the fluorine-chloride mixed molten salt containing TiO2 to the electrolytic temperature of 650-850 DEG C in an inert atmosphere, inserting a cathode and an anode, carrying out primary molten salt electrolysis, taking out a cathode product, and carrying out secondary electrolytic treatment on the cathode product to obtain the TiO2 / TiO2 composite material. Performing vacuum distillation or washing on the cathode product to remove impurities, and drying to remove attached electrolyte to obtain a primary electrolytic product crude titanium; the method comprises the following steps: by taking primary electrolysis product crude titanium as a soluble anode, high-purity metal titanium as a cathode and chloride molten salt as secondary electrolysis molten salt, heating the chloride molten salt to the electrolysis temperature of 550-750 DEG C in an inert atmosphere, inserting the cathode and the anode, performing electrolytic refining, and washing the electrolysis product with diluted hydrochloric acid and deionized water to remove impurities, thereby obtaining the low-oxygen metal titanium powder. A low-melting-point molten salt system is adopted in two-step electrolysis, and energy consumption can be effectively reduced.

The invention discloses a preparation method of high-purity rhenium powder, and belongs to the field of metal processing.The method prepares a final product through first-stage gradient type high-temperature reduction treatment and second-stage low-temperature reduction treatment.The method is simple in production process, simple in manual operation step, low in production energy consumption, high in crystallinity of the produced product, low in oxygen content and suitable for industrial production. And the purity can reach 4N or above.

The invention provides a preparation method of fine low-oxygen spherical Ti-based high-entropy alloy powder, and relates to the technical field of spherical titanium-based alloy powder. The preparation method comprises the steps of raw material selection and treatment of the wire, preparation of the pre-alloyed wire, preparation of the titanium-based high-entropy alloy wire, treatment of the titanium-based high-entropy alloy wire, establishment of a gas system, high-frequency induction preheating, radio frequency plasma smelting and atomization pulverization which are carried out in sequence. Through multiple wire twisting, multiple continuous hot drawing, diffusion homogenization annealing, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation, the Ti-based high-entropy alloy wire with uniform component distribution can be directly prepared at a low temperature, then the Ti-based high-entropy alloy fine powder with low oxygen content and uniform component distribution is prepared, and the Ti-based high-entropy alloy fine powder is suitable for additive manufacturing and has good application prospects. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.

The invention discloses a preparation method of low-gas high-purity chromium. The preparation method comprises the following steps: S1, preparing part of metal chromium by adopting an aluminothermic method, and crushing the metal chromium into powder with the particle size of 60-200 meshes; preparing the other part of metal chromium by adopting an electrolytic method, and crushing the metal chromium into powder with the particle size of 60-200 meshes; s2, the two parts of metal chromium powder and graphite powder are mixed and pressed into a round ingot of 30 mm * (18 + / -2) mm, the round ingot is loaded into a graphite crucible, and the graphite powder accounts for 0.5%-2% of the total mass of the round ingot; s3, the graphite crucible containing the round ingot is put into a vacuum furnace to be smelted; heating is started when the vacuum degree in the vacuum furnace is smaller than or equal to 5 Mpa, the temperature is increased to 1400-1600 DEG C and kept for 10-15 h, then cooling is conducted, when the temperature is reduced to 1200-1100 DEG C, hydrogen is charged into the vacuum furnace to 15-20 Pa, and pressure is kept for 1 h; and S4, after pressure maintaining is finished, the temperature is increased to 1400-1600 DEG C, heat preservation is carried out for 2 h, then cooling is carried out, and when the temperature is reduced to the room temperature, discharging is carried out.

The invention relates to ultra-pure oxygen-free copper and a preparation method thereof.The preparation method comprises the steps that firstly, cathode copper is added into a graphite crucible of an electric vacuum high-temperature purification furnace to be melted into molten copper; secondly, after the molten copper is subjected to standing and heat preservation, a heating cover of the electric vacuum high-temperature purification furnace is slowly lifted upwards, and the molten copper in the graphite crucible is slowly solidified from the bottom till the molten copper is completely solidified; and then, the solidified cast ingot is taken out, the two ends of the cast ingot are cut off, the remaining cast ingot obtained after cutting is conducted repeatedly according to the first two steps, and the ultra-pure oxygen-free copper cast ingot is obtained after circulation is conducted for 3-5 times. The purity of the prepared ultra-pure oxygen-free copper is 5N-6N, the oxygen content is less than 2ppm, and the hydrogen content is less than 1ppm. The method is simple and reliable to operate, cast ingots with different copper contents can be prepared according to different application directions, and meanwhile, the oxygen content is also controlled at an extremely low level due to the fact that the cast ingots are extremely low in gas content and good in compactness.

The invention relates to a self-circulation continuous electric deoxidation device and process, and belongs to the technical field of smelting deoxidation. The device comprises an electrolytic tank, a solid-liquid thermal separation tank and a cathode basket, the electrolytic tank is arranged above the solid-liquid thermal separation tank, electrolyte molten salt, an anode material and the cathode basket are arranged in the electrolytic tank, a powdery electric deoxidation cathode material is placed in the cathode basket, the bottom of the cathode basket penetrates out of the tank bottom of the electrolytic tank, and the solid-liquid thermal separation tank is arranged above the cathode basket. An electromagnetic valve is arranged; the electrolytic bath is connected with the solid-liquid thermal separation tank through a circulating fused salt pipeline, and a circulating pump is arranged on the pipeline. According to the self-circulation continuous electric deoxidation device and process, continuous operation of electrochemical deoxidation of high-activity powder is achieved, and therefore the space time yield for limiting high-temperature fused salt electric deoxidation is remarkably increased.