4858 results about "Ingot" patented technology

The invention belongs to the technical field of non-oriented electrical steel manufacturing, and relates to a method for producing non-oriented silicon steel based on thin-strip cast rolling. The low-silicon and aluminum-free component design is adopted, the hot-rolled thin substrate is directly obtained through thin strip cast rolling, casting blank continuous casting and casting blank heating are omitted, the hot rolling reduction is greatly reduced, it is avoided that unfavorable textures of alpha and gamma components in the finished non-oriented silicon steel are remarkably improved, and the high magnetic induction of the finished product is guaranteed; after acid pickling and cold rolling, grain growth is promoted by means of high-temperature cover annealing, and low iron loss of a finished product is guaranteed; the high-magnetic-induction low-iron-loss non-oriented silicon steel with the thickness specification of 0.50 mm is obtained, the grain size of a finished product is 80-100 microns, the iron loss P1.5 / 50 is smaller than or equal to 4.0 W / kg, and the magnetic induction B5000 is larger than or equal to 1.76 T.

This invention discloses a process for controlling the shape of A514GrQ extra-thick plates for offshore platforms. It uses 800-1000mm thick steel ingots, and after removing and cleaning the ingot risers, ensures uniform thickness of the ingot body, laying the foundation for obtaining steel plates with excellent flatness. The heating process is optimized to ensure uniform heating of the ingot head, middle, and tail, facilitating uniform deformation during rolling. Homogenized rolling is employed to reduce cooling water usage, limit the reduction per pass, and control the final rolling temperature, avoiding uneven internal stress and shape rebound in the steel plate. The final product is a 180-210mm thick steel plate with a maximum flatness ≤8mm and a lateral flatness ≤4mm within a length of 10000mm and a width of 2400mm, significantly reducing subsequent leveling tasks.

The invention provides steel structure profile cutting equipment. The steel structure profile cutting equipment comprises a conveying assembly, a cutting assembly, a discharging assembly, a flow dividing driving assembly and a positioning assembly. The conveying assembly conveys profiles through a bearing roller A, the discharging assembly adopts a liftable bearing roller B to achieve automatic discharging, the flow dividing driving assembly independently drives the conveying action and the discharging action through a ratchet mechanism, and interference is avoided. The positioning assembly comprises a width fixing mechanism, a thickness adapting mechanism and a guiding and clamping mechanism, the clamping position can be adjusted in a self-adaptive mode, and it is ensured that the profiles are guided stably in the conveying process and fixed firmly in the cutting process. The cutting assembly adopts a hydraulic drive disc saw, and precise cutting is achieved. The equipment has the advantages of high-precision positioning, automatic adjustment, efficient continuous operation and the like, is suitable for fixed-length cutting of heavy profiles such as large steel ingots and steel columns, and effectively improves the machining efficiency and the cutting quality.

The invention discloses a forging method for improving plasticity of a large invar alloy steel ingot and invar alloy, and the forging method comprises the following steps: smelting molten steel by adopting an electric furnace, and casting to obtain the large invar alloy steel ingot with the weight of 15-25t; the cold-state invar alloy steel ingot is heated to 1000-1200 DEG C for heat preservation, and the heat preservation time is controlled to be longer than or equal to 10 h; the heated invar alloy steel ingot is subjected to three-heating-number upsetting and drawing-out, upsetting is conducted according to the rolling reduction of 15-50% of the total height of the invar alloy steel ingot in each heating number, the invar alloy steel ingot is drawn out to the height of the original invar alloy steel ingot after upsetting, and the invar alloy steel ingot is returned to a heating furnace to be heated and subjected to heat preservation after upsetting and drawing-out in each heating number; the final forging temperature of the last heating number is greater than or equal to 750 DEG C; and the invar alloy steel ingot subjected to heating and heat preservation in the last heating number is forged to the specified size, and then the invar alloy steel ingot is slowly cooled to the room temperature in air to obtain an invar alloy steel forging stock. The thermoplasticity of the large invar alloy steel ingot is improved, and the technical problem that the large invar alloy steel ingot is prone to cracking during forging is solved.

The application belongs to the technical field of zinc alloy, and particularly relates to an anti-aging high-strength and high-toughness degradable zinc alloy bar, a preparation method and application, which comprises the following components by weight percentage: Cu 1.5-2.0%, Mg 0.01-0.05%, and the balance of Zn; the preparation method of the anti-aging high-strength and high-toughness degradable zinc alloy bar is that zinc alloy ingots are sequentially subjected to homogenization treatment and multi-pass rotary forging treatment to obtain the anti-aging high-strength and high-toughness degradable zinc alloy bar, and the number of passes is more than 7; the application has good strength, toughness and anti-aging capacity.

The invention discloses a preparation method of a high-homogeneity and high-stability copper target material, which comprises the following steps of: 1, cutting off a riser of a high-purity copper cast ingot, and turning to obtain a pretreated high-purity copper cast ingot; secondly, the pretreated high-purity copper ingot is heated and subjected to heat preservation in a furnace and then forged to obtain a forged copper blank; thirdly, the forged copper blank is subjected to room-temperature circumferential rolling treatment, and a rolled copper blank is obtained; fourthly, the rolled copper blank is subjected to two-stage annealing heat treatment, and a copper target blank is obtained; and 5, machining, cleaning and packaging to obtain the high-homogeneity and high-stability copper target material. According to the method, the high-purity copper cast ingot is sequentially subjected to pretreatment, forging, room-temperature circumferential rolling, two-stage annealing, machining, cleaning and packaging, preparation of the high-quality copper target material which is uniform in structure, controllable in crystal orientation and excellent in heat stability is achieved, the sputter coating quality is improved, and the method is easy to operate, high in controllability, high in production efficiency and suitable for industrial production. Meanwhile, raw materials and production cost are saved, and the method is suitable for large-scale popularization and application.

The present invention provides a method and apparatus for laser stripping a silicon carbide ingot. The method first transmits an ultrashort pulse laser beam through the first end face of the silicon carbide ingot and focuses it on a set depth layer of the ingot. A cavity-modified region and a crack-modified region are generated above the set depth layer, respectively, and scanned to form the cavity-modified layer and the crack-modified layer. A short pulse laser beam then transmits the second end face of the silicon carbide ingot and focuses it on the cavity-modified region. The beam scatters and propagates within the cavity-modified region, causing the heat from the short pulse laser beam to act on the cavity-modified region, causing cracks within the crack-modified region to grow laterally outward. Scanning is then performed to connect cracks within adjacent cavity-modified regions within the cavity-modified layer through lateral growth. This reduces the amount and length of cracks in the modified layer extending longitudinally along the silicon carbide ingot, increases the number and length of lateral crack growth, reduces cutting loss, and reduces waste.

The invention belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon environment-friendly method for producing a high-strength 8006 alloy container foil, aluminum alloy component proportion and melt treatment and cold rolling production processes are optimized, a large amount of regenerated aluminum waste can be digested, energy consumption is lower than that of a primary aluminum ingot by 50% or above, a blank with the thickness of 1.5 mm is produced through triple continuous rolling, and the production cost is low. The container foil finished product is rolled through 4-5 passes of cold foil rolling, compared with a conventional scheme, the rolling passes are reduced by 2-3, the machining cost is saved by 500 yuan / ton, the blank thickness can be reduced through the production scheme, the cold foil rolling production passes are reduced, high-temperature intermediate annealing is not needed in the cold rolling production process, about 280 kw.h annealing power consumption is saved for each ton, low-carbon short-process production is achieved, and the production cost is reduced. The tensile strength of the finished product is larger than or equal to 150 MPa, the ductility is larger than or equal to 18%, the tensile strength is about 20 MPa higher than that of container foil produced through a conventional scheme, deformation is not likely to happen after punching forming, and the terminal use effect is better.

According to the smelting method for refining the size of the inclusions of the invar alloy and the invar alloy, a large-size invar alloy steel ingot is prepared through the processes of induction furnace smelting, AOD furnace refining, LF furnace refining, VD furnace refining and die casting, in the AOD furnace refining process, an Al-Si-Mn composite deoxidizing agent is adopted for deoxidizing, in the LF furnace refining process, Ni-Mg alloy is added, and in the VD furnace refining process, the Al-Si-Mn composite deoxidizing agent is adopted for deoxidizing; the impurities are decomposed and refined, the impurities are controlled to be Al2O3-MgO-SiO2 series impurities, the grade of the A type impurities, the grade of the B type impurities, the grade of the C type impurities and the grade of the D type impurities are smaller than or equal to 0.5 grade, and the grade of the Ds type impurities is 0 grade. The method can effectively refine the size of the inclusions in the invar alloy molten steel, reduce the occurrence rate of local peeling defects on the surface of the cold-rolled strip caused by large-size deoxidized products, and improve the product quality and the yield of the invar alloy strip.

The invention discloses a production process of a high-strength anti-corrosion power transmission pole cross arm. The production process comprises the following steps that 1, an anti-SCC aluminum alloy is selected; a trace amount of Sc is added to refine grains, so that the corrosion resistance is improved; cold machining is avoided, and a warm forming process is adopted; 2, aluminum alloy ingot smelting and hot extrusion forming are carried out; 3, T6 solid solution treatment is carried out to improve the strength; 4, the five-axis CNC machining center conducts structural topology optimization cutting; the surface roughness Ra of a key bearing part is less than or equal to 0.8 mu m; an ultrasonic-assisted drilling technology is adopted; step 5, micro-arc oxidation; and step 6, ultrasonic flaw detection and infrared thermal imaging. The 5083-H116 aluminum alloy is combined with Sc microalloying, precision machining and micro-arc oxidation technologies, so that the stress corrosion resistance is improved by 3 times, the fatigue life is prolonged by 2-3 times while the tensile strength of the power transmission pole cross arm is kept to be larger than or equal to 350 MPa, 5000-hour salt mist protection and 30-year maintenance-free are achieved, and the service life of the power transmission pole cross arm is prolonged. The problems of corrosion cracking, short fatigue life and insufficient durability of a traditional product in a harsh environment are comprehensively solved.

The invention discloses a manufacturing method of a high-efficiency and low-cost steel plate for a 345MPa-grade low-temperature pressure vessel, and belongs to the technical field of low-carbon microalloyed steel production. The manufacturing method comprises the steps of molten steel smelting, LF refining, RH vacuum degassing, continuous casting, casting blank heating, rolling, controlled cooling and straightening. The problems that steel plate rolling efficiency is low, rolling resistance is large, and the plate shape is not easy to control are solved, the steel plate is low in cost, high in strength and toughness and high in straightness, and the service safety of the steel plate for the low-temperature pressure container can be guaranteed.

The invention discloses a TC4 titanium alloy preformed blank, a TC4 titanium alloy plate with a full lamellar structure and a preparation method of the TC4 titanium alloy plate, and belongs to the technical field of titanium alloy machining. According to the method, TC4 alloy powder prepared through hydrogenation dehydrogenation and plasma rotating electrode atomization serves as a raw material, and a high-density binary structure preformed blank is prepared through a three-step type hot isostatic pressing technology; a pure titanium sheath is adopted for packaging, two-heating-number rolling is conducted through the sheath, and the plate shape is optimized through convexity design of a working roller and dynamic roller bending force control; and after rolling, solid solution and two-stage aging composite heat treatment are combined, the head and the tail are cut off, and the TC4 titanium alloy plate is obtained. The problem of tissue segregation of a traditional cast ingot is solved through powder metallurgy, the obdurability is improved, and the anisotropy is reduced; and meanwhile, the raw material cost is reduced, the production period is shortened, the yield is increased, the surface quality is improved, and a reliable scheme is provided for green and efficient preparation of high-performance titanium alloy plates in the aerospace field.

The invention discloses a titanium alloy based on lamellar alpha phase and nanophase precipitation and a preparation method of the titanium alloy, belongs to the field of titanium alloy materials, and aims to solve the bottleneck that strength and work hardening of a high-strength titanium alloy are difficult to cooperate. The titanium alloy comprises, by weight, 2.0%-7.5% of Al, 1.0%-6.0% of V, 1%-8% of x (x is at least one eutectoid beta stable element of Fe, Mn, Cr, Ni and Cu) and the balance Ti and impurities. And the beta-phase molybdenum equivalent [Mo] eq is controlled to be 5.0-10.0. The preparation method comprises the following steps: 1) smelting an ingot for three times in a vacuum consumable electric arc furnace, and cutting a dead head after scaling and flaw detection; (2) carrying out hot rolling at 810-950 DEG C in an alpha + beta two-phase region with the accumulative deformation amount of 75-95%, and constructing a multi-scale lamellar alpha phase, and (3) carrying out solid solution for 30-120 minutes at 700-850 DEG C, rapidly cooling at 50-250 DEG C / s, and inducing the precipitation of a nano eutectoid compound. Aging treatment is not needed, the yield strength is greater than 900 MPa, the work hardening amount is greater than 150 MPa, the elongation is greater than or equal to 15%, the process is simple and easy to industrialize, and the method can be applied to the fields of aerospace, ocean engineering and the like.

The invention discloses a 1500MPa-grade titanium alloy bar and a preparation method thereof, and belongs to the field of titanium alloy preparation. The 1500MPa-grade titanium alloy bar comprises the following chemical components in percentage by mass: 5.5 to 6.5 percent of V, 4.5 to 5.5 percent of Mo, 3.0 to 4.0 percent of Al, 2.5 to 3.5 percent of Zr, 1.5 to 2.5 percent of Cr, 1.5 to 2.5 percent of Nb, 0.9 to 1.1 percent of Fe and the balance of Ti and impurities. The preparation method comprises the following steps: preparing raw materials according to the components, pressing the raw materials into electrode blocks, welding to obtain consumable electrodes, and performing multi-vacuum consumable smelting to obtain cast ingots; the cast ingot is subjected to cogging forging in a beta area, multi-heating-number upsetting and drawing deformation in the beta area and forged into a bar in a two-phase area; and through multi-pass rolling and multiple solid solution aging heat treatment, the 1500MPa-grade titanium alloy bar is obtained, meanwhile, the ductility is kept to be 6% or above, and the requirement of future aerospace for high-performance titanium alloy is met.

The invention relates to the technical field of magnesium ingot conveying, in particular to a discharging and conveying device and method for magnesium ingot conveying The discharging and conveying device comprises a rack, a continuous casting machine body and a conveying mechanism are vertically distributed on the rack, the continuous casting machine body is used for conveying produced magnesium ingots from left to right, and a limiting mechanism is arranged on the rack. A side scrap removing mechanism is arranged between the continuous casting machine body and the conveying mechanism, the magnesium ingot discharging angle, the optimal discharging position and the vertical sliding track can be accurately controlled, and the magnesium ingots are prevented from deviating in the conveying process; chippings and impurities on the surfaces of the magnesium ingots are brushed away, and the situation that normal conveying of the magnesium ingots is affected due to deviation of conveying of the magnesium ingots caused by blockage, blockage and clamping stagnation of chain seams of the conveying mechanism due to direct contact with the conveying mechanism after blanking is prevented; the arrangement action of a plurality of magnesium ingots required by stacking is preposed, and the situation that the magnesium ingots and a chain belt are scraped when the magnesium ingots are stacked at a processing point and wait for a stacking robot to grab the magnesium ingots is reduced.

The invention provides an aluminum ingot production process quality monitoring method and system, and belongs to the technical field of quality detection.The method comprises the steps that image acquisition is conducted on an aluminum ingot based on an image acquisition trigger signal, and aluminum ingot image data are obtained; performing defect identification on the aluminum ingot based on the aluminum ingot image data to obtain first defect information of the aluminum ingot; the first defect information comprises a defect proportion and a defect position of the aluminum ingot; in response to the condition that the aluminum ingot defect ratio is smaller than a first preset ratio, determining an ultrasonic scanning path based on the defect position; performing ultrasonic scanning on the aluminum ingot based on the ultrasonic scanning path to obtain aluminum ingot ultrasonic data; second defect information of the aluminum ingot is obtained based on the aluminum ingot ultrasonic data, and the quality grade of the aluminum ingot is determined based on the second defect information; the second defect information is the internal defect of the aluminum ingot. According to the aluminum ingot production process quality monitoring method and system provided by the invention, the aluminum ingot quality control and production efficiency can be improved.

The invention provides a preparation method of an Al-Mg-Mn-Sc series aluminum alloy plate. The preparation method comprises the following steps: S1, carrying out hot rolling on an Al-Mg-Mn-Sc series aluminum alloy cast ingot; s2, the hot-rolled aluminum alloy plate is pre-annealed and then cold-rolled for the first time; s3, carrying out intermediate annealing on the cold-rolled aluminum alloy plate, and then carrying out secondary cold rolling; and S4, the aluminum alloy plate obtained in the step S3 is subjected to air cushion furnace rapid annealing. The invention further provides application of the aluminum alloy plate prepared through the method. According to the preparation method of the Al-Mg-Mn-Sc series aluminum alloy plate, through accurate component regulation and control and process optimization, the strength of the aluminum alloy plate is improved, and the mechanical property of the aluminum alloy plate is not obviously reduced under the 280 DEG C brazing machining condition.

A copper-aluminum composite plate material prepared by aluminum liquid continuous casting and a process thereof. The method includes: S1, heating an aluminum ingot to 700-800° C. and smelting for 1-3 h; S2, degassing smelted aluminum liquid, and keeping the temperature and standing; S3, texturing a copper strip, and then cleaning; S4, heating the pretreated copper strip to 200-650° C.; S5, under the protection of inert gas, continuously casting the treated aluminum liquid on the treated copper strip, performing quenching crystallization on a copper-aluminum composite material, and performing oxygen-free continuous casting; and S6, continuous rolling: rolling the continuously cast copper-aluminum composite material to obtain the copper-aluminum composite plate material prepared by aluminum liquid continuous casting.

The embodiment of the invention relates to the field of radioactive waste treatment, in particular to a solidification method. According to the method, a conveying and jacking device is used for conveying a material containing device to enable the material containing device to receive powdery materials, a clamping and transferring device and a lifting device are used for conveying the material containing device completing feeding into a material processing device to enable the powdery materials to be partially molten, and a pressurizing device is used for pressing and compacting the partially molten materials; and finally, ingot-shaped solid materials are formed in the material containing device, then the lifting device and the clamping and transferring device are utilized again to transfer the material containing device to the conveying and jacking device so as to transfer the ingot-shaped solid materials, in this way, the process from powder feeding to ingot forming of the materials is conducted in the material containing device, the situation that a material container is replaced in the midway is avoided, and the production efficiency is improved. Operation steps are simplified; and the clamping and transferring device, the lifting device and the conveying and jacking device all participate in the front process and the rear process of material treatment, so that reuse of equipment parts is achieved, and the equipment composition is simplified.

The utility model discloses a special-shaped lithium strip rolling and shaping device which is sequentially provided with a lithium strip placing mechanism and a special-shaped rolling mechanism along a processing path, the lithium strip placing mechanism is used for placing a lithium ingot; the special-shaped rolling mechanism comprises a first special-shaped roller and a second special-shaped roller which can move towards each other and away from each other, the outer surface of one of the first special-shaped roller and the second special-shaped roller is provided with a circumferentially-arranged convex strip, the outer surface of the other one of the first special-shaped roller and the second special-shaped roller is provided with a circumferentially-arranged groove, and the convex strip and the groove are oppositely arranged. The convex strips are matched with the grooves to press indentations on the lithium strip; after the scheme is adopted, the problem of poor production quality of the existing rolling and shaping device can be solved, the rigidity of a lithium strip can be improved, the tension control of unwinding of the rolled lithium strip can be better controlled, the flowability of lithium can be reduced, the problem of material stacking in the rolling process can be better solved through indentations, the rolling speed can be increased, and the production efficiency and the qualified rate can be improved.

The invention discloses a hot melting forming device and method for a synthetic quartz glass cylinder, through modular structural design, the synergistic effect of positioning, exhausting, pressing and forming is achieved, and the hot melting forming device for the synthetic quartz glass cylinder specifically comprises a graphite pressure head connecting rod, a graphite pressure head, a graphite center rod and a forming mold. According to the hot-melting forming method for the synthetic quartz glass cylinder, the device is adopted, a synthetic quartz glass ingot is pretreated, a low-impurity demolding material is laid during assembling, gradient heating is conducted on three temperature areas of a heating furnace, pressurization is conducted after softening, and then differential cooling is conducted, so that efficient preparation of the high-purity synthetic quartz glass cylinder is achieved; and the purity of the finished product meets the strict requirements of high-precision processes such as semiconductor wafer processing and thin film deposition on the material purity. According to the invention, the large-diameter and ultra-long synthetic quartz glass cylinder can be stably produced, the requirement of large-size development of semiconductor equipment is met, and the blank in the field of large-size high-purity quartz glass cylinder preparation in the prior art is filled.

The embodiment of the invention provides a method and device for automatically controlling a semiconductor crystal ingot to enter a water tank, and relates to the technical field of semiconductor crystal ingot processing auxiliary equipment.The device comprises a rack, a lifting and transplanting device is arranged on the rack, a turnover positioning device is arranged on one side of the lifting and transplanting device, and a first conveying device is arranged on the other side of the lifting and transplanting device; the lifting transplanting device comprises a lifting mechanism, the lifting mechanism is arranged at the tail end of the first conveying device, a transverse moving mechanism is arranged above the lifting mechanism, the overturning positioning device comprises an overturning working frame, a lifting device is arranged on the overturning working frame, an overturning driving part is arranged on the lifting device, and the U-shaped conveying group is arranged on the other side of the overturning positioning device. A turnover workbench is arranged on the turnover driving part, a positioning tool is arranged on the turnover workbench, and the turnover driving part is a servo motor. The device has the effects that operation is stable, and the crystal ingot is prevented from being collided and damaged.

The invention relates to the technical field of metal smelting, and particularly discloses a preparation method of a high-purity IN718 alloy material. According to the method, on the premise that the mechanical property result redundancy of the IN718 alloy material is large, the content of inclusions and formation of carbides in the steelmaking process are reduced by optimizing the content of C, N and Nb elements in the vacuum induction melting process, reducing the refining temperature and reducing the melting speed of vacuum self-consuming remelting; and in cooperation with two-heating-number upsetting and drawing deformation in the forging process, the situation that carbides in the IN718 alloy material are dispersed unevenly due to segregation is avoided. According to the high-purity IN718 alloy material and the preparation method thereof, the content of carbides in steel ingots is remarkably reduced by controlling all parameters in the duplex process, the overall level of the carbides in the high-purity IN718 alloy material is smaller than or equal to 2.0 level after homogenizing diffusion annealing, forging, machining and heat treatment, the purity of the existing IN718 alloy material is improved, and the use requirements of special equipment such as deep sea equipment and nuclear power equipment can be met.

The invention relates to a titanium alloy smelting quality management method and system. The method comprises the steps that real-time monitoring data in the titanium alloy smelting process are collected; classifying and storing the real-time monitoring data to obtain historical process data; performing equipment abnormity early warning based on the equipment operation data and a preset first early warning rule, and generating first early warning information; obtaining a process capability index based on the process control node data, performing process data deviation early warning based on the obtained process capability index and a preset second early warning rule, and generating second early warning information; performing product manufacturing and detection early warning based on the ingot casting product manufacturing and detection data and a preset third early warning rule, and generating third early warning information; and displaying and processing the first early warning information, the second early warning information and the third early warning information in a man-machine interaction mode. Effective guidance is provided for quality management of titanium alloy smelting, and potential problems can be found and eliminated in time.

The invention relates to the technical field of titanium material manufacturing, in particular to a tensile titanium alloy wire machining process which comprises the steps that aluminum, vanadium, iron, carbon, nitrogen, hydrogen, oxygen and titanium are put into a vacuum consumable electric arc furnace in proportion to be smelted, and a titanium alloy cast ingot is obtained; the titanium alloy cast ingot obtained after chemical cleaning is heated and forged; the forged blank is rolled and drawn, and the drawn wire is subjected to annealing treatment; collecting the temperature of each position of each temperature area in the continuous annealing furnace at each moment, and determining the thermal diffusion fluctuation of each position in the continuous annealing furnace in each time period; calculating the heat flow coefficient of each position in the continuous annealing furnace in each time period; acquiring proportional parameters of a PID controller in each position and each time period in the continuous annealing furnace, and controlling the temperature of each position by using the PID controller; and the titanium alloy wire is obtained after annealing treatment. The tensile property of the titanium alloy wire is improved.

The invention belongs to the technical field of aluminum alloy material preparation, and particularly relates to an optical microcrystalline aluminum material, a preparation method and application, an aluminum alloy ingot is extruded twice to obtain an extruded bar, the extrusion temperature is 275-325 DEG C and the extrusion ratio is 2-8 during primary extrusion, and the extrusion temperature is 375-425 DEG C and the extrusion ratio is 20-30 during secondary extrusion; the extruded bar is sequentially subjected to annealing treatment, drawing treatment and stabilizing heat treatment, the optical microcrystalline aluminum material is obtained, and the temperature of the stabilizing heat treatment is 90-240 DEG C; the grain size and the surface roughness are reduced, and meanwhile the hardness is improved.

The invention belongs to the technical field of high-temperature alloy production, and relates to a large-size GH4141 high-temperature alloy fine-grain bar and a preparation method thereof.By means of the forging technology of high-temperature cogging forging, low-temperature forging and medium-temperature finished product forging, the plasticity of a cast ingot is improved through upsetting and drawing-out in the high-temperature stage, and an as-cast structure is fully broken; grains are refined through low-temperature stage upsetting and drawing deformation, and distortion energy is accumulated; through the synergistic effect of dynamic recrystallization and static recrystallization, the bar structure is further refined, and the structure uniformity is improved.

The invention relates to a quartz crucible coating and a preparation method thereof.The coating is of a double-layer composite structure and comprises a substrate layer and a functional layer, the substrate layer is composed of 40-65 vol% of polycrystalline silicon powder (the particle size D50 ranges from 1 micrometer to 5 micrometers) and 35-60 vol% of nanometer silica sol, and the functional layer covers the surface of the substrate layer and is composed of 50-70 vol% of polycrystalline silicon powder, 20-35 vol% of nanometer silica sol and 5-15 vol% of calcium fluoride powder (the particle size D90 is smaller than 0.5 micrometer). The preparation method comprises the following steps: preparing a substrate layer slurry and a functional layer slurry, sequentially coating the inner wall of a crucible with the slurry, drying, and sintering in an inert atmosphere according to a three-step temperature control program to finally form a coating with the thickness of 180-300 microns and the porosity of 8-15 vol%; the coating structure can avoid pollution of silicon nitride or silicon carbide particles, has excellent demolding performance, thermal stability and adhesive force, further improves the service life of a crucible and the purity of a silicon ingot, and meets the requirements of an advanced semiconductor process for cleanliness and reliability.

The invention discloses a TC4 titanium alloy preformed blank, a TC4 titanium alloy plate and a preparation method of the TC4 titanium alloy preformed blank and the TC4 titanium alloy plate, and belongs to the technical field of titanium alloy machining. According to the method, TC4 alloy powder prepared through hydrogenation dehydrogenation and plasma rotating electrode atomization serves as a raw material, and a high-density binary structure preformed blank is prepared through a three-step type hot isostatic pressing technology; a pure titanium sheath is adopted for packaging, two-heating-number rolling is conducted through the sheath, and the plate shape is optimized through convexity design of a working roller and dynamic roller bending force control; and after rolling, the head and the tail are cut off in combination with composite heat treatment, and the TC4 titanium alloy plate is obtained. According to the method, the problem of traditional cast ingot structure segregation is solved through powder metallurgy, the preparation cost of the TC4 titanium alloy plate is reduced, the production period is shortened, the yield and the surface quality are improved, and a reliable scheme is provided for green and efficient preparation of the high-performance titanium alloy plate in the aerospace field.

The invention discloses a preparation method of niobium-tungsten alloy spherical powder and a 3D printing method of the niobium-tungsten alloy spherical powder, and belongs to the technical field of refractory metal material preparation.The preparation method comprises the steps that niobium, tungsten, molybdenum and zirconium refractory metal raw materials are smelted to obtain cast ingots with uniform components, and hydride powder is formed after hydrotreating and mechanical crushing; spherical powder is prepared by adopting a plasma spheroidizing technology, then dehydrogenation is performed for 1-3 hours at the temperature of 450-750 DEG C, magnesium powder is added, treatment is performed for 2-5 hours in an inert atmosphere at the temperature of 800-1100 DEG C, and finally the low-oxygen niobium-tungsten alloy spherical powder with the oxygen content lower than 120 ppm is obtained. Compared with a traditional process, the spheroidizing treatment is innovatively carried out before the dehydrogenation and oxygen reduction process, the deoxidation efficiency is improved through the relatively small specific surface area of spherical powder, and oxygen content control is achieved in combination with magnesium powder heat treatment. The problems of high oxygen content and low powder yield in a traditional process are solved, and material support is provided for high-performance niobium-tungsten alloy components in the fields of aerospace, nuclear power and the like.