21results about How to "Avoid compositional segregation" patented technology

The invention belongs to the technical field of thermal barrier coatings, and provides an artificial preparation method of multi-scale aero-engine environment sediment particles. The preparation method comprises the following steps: grinding CMAS original powder into mixture powder; calculating the mass of the required mixture powder according to the powder density of the CMAS original powder and the particle size of the target sediment particles; weighing the mixture powder, and pressing the mixture powder into sheets; in an air suspension furnace, tabletting and melting the mixture powder into balls by adopting a laser; and rapidly cooling to normal temperature to obtain the target sediment particles with the target particle size. The melting process of the CMAS powder is greatly improved, the gas suspension furnace and the laser are used for heating, single CMAS particles with the designed size can be obtained in a short time, the preparation time is shortened, and the preparation cost is effectively reduced.

The medium-temperature radial forging method comprises the steps that pretreatment is conducted, specifically, a niobium-tungsten alloy extrusion bar blank is heated for 60-180 minutes at the temperature of 750-950 DEG C, rapid forging and straightening are conducted, and a medium-temperature radial forging bar blank is obtained and annealed for 60-120 minutes at the temperature of 1250-1450 DEG C; medium-temperature radial forging is conducted, specifically, a two-step method is adopted, in the first step, a bar blank is preheated to 80-100 DEG C and coated with Ta1350 high-temperature glass powder, heat preservation is conducted for 90-180 minutes at the temperature of 1050-1150 DEG C, and the bar blank is forged into a bar with the diameter of 70 + / -1 mm in the mode that the diameter is reduced by 7-10 mm every time; and in the second step, the heating and coating processes are repeated, the diameter is reduced by 5-7 mm every time, and the bar with the required specification is manufactured. By optimizing the medium-temperature forging and annealing process, the fine grain structure is controlled, the high-temperature mechanical property, creep resistance and oxidation resistance of the material are improved, and the material is suitable for aerospace engines and other high-temperature and high-pressure scenes. Compared with a traditional method, the technology improves the yield, shortens the production period, reduces the labor intensity, is suitable for large-scale production, reduces surface air suction, oxidation and burning loss, and improves the production efficiency and the finished product quality.

The invention relates to a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof, and belongs to the technical field of metal smelting. The GH5605 alloy comprises the following chemical components: 0.05%-0.15% of C, less than or equal to 1.0% of Si, 1.0%-2.0% of Mn, less than or equal to 0.03% of S, less than or equal to 0.03% of P, 19.0%-21.0% of Cr, 9.0%-11.0% of Ni, 14.0%-16.0% of W, less than or equal to 3.0% of Fe and the balance of Co and other inevitable impurities. According to the manufacturing method, the GH5605 electrode bar is smelted through a vacuum induction furnace, refining and argon protection processes are adopted, and it is ensured that the Mn element content of the electrode bar is qualified. And in the vacuum consumable remelting process, argon with the pressure of 2000-3000 Pa is filled, so that the vacuum degree is reduced, Mn element volatilization is effectively inhibited, and section component uniformity is achieved. Detection shows that the Mn content at the edge, the 1 / 2 radius and the central part of the steel ingot meets the technical standard. The process is simple and efficient, the quality of molten steel is not affected, the performance consistency and production stability of the GH5605 steel ingot are remarkably improved, and the process is suitable for the high-end application field.

The invention discloses a manufacturing method of a semi-high-speed steel supporting roller, which belongs to the field of roller manufacturing and comprises the following steps: preparing steel raw materials, so that the steel comprises the following chemical components in percentage by weight: 0.35-0.45% of C, 1.20-1.40% of Si, 0.40-0.60% of Mn, 7.00-9.00% of Cr, less than or equal to 1.00% of Ni, 2.00-3.00% of Mo, 0.50-0.80% of V and less than or equal to 0.010% of P; s is less than or equal to 0.010%; and the balance of Fe and inevitable impurities. Molten steel is prepared according to a steel smelting principle, and a steel ingot is prepared by pouring the molten steel according to a low-pouring-speed technology; a steel ingot is manufactured into a roller blank according to a forging procedure production process, the roller blank is sequentially subjected to heat treatment including preheating, high-temperature heating, precooling, rapid cooling and three times of tempering, the roller blank subjected to heat treatment is machined, the dimensional tolerance and the form and location tolerance of all parts are guaranteed, and finally the forged steel supporting roller made of the semi-high-speed steel material is obtained. According to the method, the large forged steel supporting roller with high wear resistance and high accident resistance can be produced, and production is effectively guaranteed.

The invention discloses a manganese-copper alloy material with stable resistance and a preparation method of the manganese-copper alloy material. The manganese-copper alloy material comprises the following components in percentage by mass: 11-13% of manganese, 0.5-1.5% of copper, 0.3-1% of indium and 0.05-0.15% of trace rare earth elements, the preparation method of the manganese-copper alloy material with stable resistance comprises the following steps: S1, premixing; s2, carrying out preforming; the method has the following beneficial effects that fine and uniform mixing is achieved through the microchannels and the like, and composition segregation is avoided; the pulse current preforming is efficient and rapid, and the boron nitride coating mold guarantees the quality and density uniformity of a preforming block; the self-adaptive air pressure regulation and control smelting system accurately controls the temperature, the air pressure and the speed of each stage, monitors and adjusts in real time, promotes atomic diffusion and alloying, improves the product quality and the qualified rate, reduces the rejection rate, and has the characteristics of efficient and stable production and wide application prospects.

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

The invention relates to the technical field of metal materials, and discloses a shape memory alloy film and a preparation method and application thereof. The shape memory alloy film comprises the following components: 50-55 at.% of Ni, 40-45 at.% of Ti, 3-5 at.% of Cu and 2-4 at.% of M, and M is selected from one or more of Zr, Hf and Nb. The shape memory alloy film has remarkable superelasticity, the recoverable strain of the shape memory alloy film can reach 8% or above, meanwhile, the compressive yield stress exceeds 1.5 GPa, and the shape memory alloy film shows excellent cycle stability. The preparation method is simple in process and high in controllability, a new scheme is provided for solving the problem of unstable performance of an existing NiTi-based film, and the preparation method is particularly suitable for high-performance micro devices such as a micro electro mechanical system.

The application relates to the technical field of semiconductors, and particularly discloses a POI substrate, a preparation method thereof and an acoustic device. The preparation method of the POI substrate comprises the following steps: providing a substrate; growing an amorphous gallium oxide layer on the substrate; and growing a nanocrystalline gallium oxide layer on the amorphous gallium oxide layer; wherein the nanocrystalline gallium oxide layer is c-axis oriented perpendicular to a section; the nanocrystalline gallium oxide layer is subjected to activation treatment to obtain a first intermediate product; a piezoelectric substrate is subjected to ion implantation to form a peeling defect layer at a preset position of the piezoelectric substrate, thereby obtaining a second intermediate product A; the first intermediate product is bonded with the second intermediate product A to obtain a third intermediate product A; the third intermediate product A is treated by using a pulse laser to convert the nanocrystalline gallium oxide layer into an epsilon-phase gallium oxide layer; and the piezoelectric substrate is split and partially peeled along the peeling defect layer to form a piezoelectric layer. By implementing the application, the heat conduction performance and reliability of the POI substrate can be improved.

The application relates to a carbon / ceramic brake disc with wear resistance improved by silicon-chromium alloy synergistic modification and a preparation method thereof. The carbon / ceramic brake disc is prepared through key steps of preparing a carbon fiber preform, a carbon / carbon composite material, ceramic powder and a carbon / ceramic composite material, and the process is through gradient melting impregnation and segmented heat treatment process, thereby avoiding the composition segregation problem caused by the traditional silicon powder embedding melting impregnation method; the structured laying of the ceramic powder positively superimposes the capillary force in the brake disc and the furnace pressure; the ceramic production efficiency is increased by 30%, and the waste rate is reduced to below 1%. In the structure aspect, the porosity of the brake disc prepared by the application is reduced to 2%-3%; in the material composition aspect, the ceramic phase in the matrix is formed by Si-Cr-C three elements to form crystals, so that the wear resistance of the composite material is increased by three times; the brake disc prepared by the application has excellent wear resistance and friction performance, and is suitable for the aerospace field.

The invention discloses a preparation method of an Al-RE intermediate alloy based on an alloy opposite doping method, which comprises the following steps: firstly, industrial pure aluminum Al and mother alloy Al-90RE are taken as raw materials, the raw materials are dried according to a mass ratio meeting the requirement of Al-(10-50) RE, then, the raw materials are melted by adopting a two-stage variable-temperature melting method to obtain an Al-RE melt, then, the Al-(10-50) RE melt is refined, and meanwhile, the Al-RE intermediate alloy is prepared by adopting an alloy opposite doping method. The steel ingot mold is preheated, and finally, the refined Al-RE melt is poured into the preheated steel ingot mold to be cooled, so that an Al-RE intermediate alloy ingot based on the alloy opposite doping method is obtained; rE is one of La, Ce or La + Ce alloy. The obtained Al-RE intermediate alloy is compact in metallographic structure and less in inclusion; in addition, the yield is greater than 90.0%.

The invention discloses a high-toughness and high-hardness ultra-coarse grain hard alloy with a Ti (C, N) reinforced high-entropy alloy as a binding phase and a preparation method of the high-toughness and high-hardness ultra-coarse grain hard alloy, and belongs to the field of hard alloy manufacturing. The ultra-coarse grain hard alloy is prepared from the following raw materials in percentage by mass: 70 to 88 percent of hard phase WC, 6 to 15 percent of binding phase CoCuFeNiCrx high-entropy alloy and 4 to 15 percent of reinforcing and toughening phase titanium carbonitride (Ti (C, N)). The CoCuFeNiCrx high-entropy alloy powder in the alloy is prepared by adopting a mechanical alloying method to prepare metal elementary substance cobalt, copper, iron, nickel and chromium powder according to a non-equal atomic ratio and carrying out high-energy ball milling. The grain size of WC in the ultra-coarse grain hard alloy prepared from the hard alloy through ball milling mixing, forming and vacuum sintering is intensively distributed between 4 microns and 7 microns, and the average grain size of WC is between 5 microns and 6 microns. And excellent mechanical properties such as hardness, fracture toughness and the like are shown. The structure design is reasonable, the preparation process is simple and controllable, the production cost is low, and large-scale industrial production and application can be achieved.

The invention discloses a molybdenum-rhenium alloy and a preparation method thereof. Belongs to the alloy field. The preparation method of the molybdenum-rhenium alloy provided by the invention comprises the following steps: smelting molybdenum-rhenium-lanthanum oxide alloy powder by adopting a vacuum electric arc to prepare a molybdenum-rhenium alloy casting blank; machining the molybdenum-rhenium alloy casting blank to obtain a molybdenum-rhenium alloy plate; the molybdenum-rhenium alloy plate is subjected to pre-strain plastic deformation treatment at the temperature of 25-1500 DEG C, and the molybdenum-rhenium alloy is obtained; the pre-strain plastic deformation treatment comprises the following steps: unloading to a zero stress state after applying 0.25%-2.5% of pre-strain quantity each time, and circulating for 100-1000 times. According to the molybdenum-rhenium alloy for improving the alpha texture strength through the deformation cumulative effect, the strength of the molybdenum-rhenium alloy with the low rhenium content is remarkably improved, the dosage dependence of rhenium resources is greatly reduced, and the production cost is reduced.

The application discloses a method for impregnating emitting substances in a ring-shaped impregnated cathode, which comprises the following steps: wrapping a molybdenum sheet around the outer surface of a ring-shaped impregnated cathode base, and then tightening the molybdenum sheet by a plurality of molybdenum wires; placing the ring-shaped impregnated cathode base with the wrapped molybdenum sheet on a molybdenum boat, and placing a conical molybdenum block at the upper end of the ring-shaped impregnated cathode base; placing a required weight of emitting substances in a cylindrical space formed by the molybdenum sheet above the ring-shaped impregnated cathode base; placing the molybdenum boat together with the ring-shaped impregnated cathode base into a hydrogen furnace for heating and heat preservation until the emitting substances are melted and filled into the pores of the ring-shaped impregnated cathode base; taking out the ring-shaped cathode base, removing the molybdenum wires, the molybdenum sheet and the conical molybdenum block, and removing the floating salt on the surface of the ring-shaped cathode base, so that the ring-shaped impregnated cathode is prepared; and the method realizes the accurate control of the impregnation process of the ring-shaped impregnated cathode through the ingenious physical packaging, simplifies the process, avoids the waste of the emitting substances and guarantees the emitting performance.

The utility model provides a multi-element magnesium-based hydrogen storage alloy preparation device. The preparation device comprises a reaction chamber, the rapid quenching pressure unit is arranged in the reaction chamber and comprises a gas inlet pipeline and a swirling gas pipeline, at least part of the gas inlet pipeline extends out of the reaction chamber, and the swirling gas pipeline is obliquely arranged at an inclination angle of 45 degrees relative to the gas inlet pipeline; the smelting and rapid quenching unit is arranged in the reaction chamber; the smelting and rapid quenching unit comprises a drip-type crucible arranged in the reaction chamber, a reaction product is stored in the drip-type crucible, and the inlet end of the drip-type crucible is communicated with the gas outlet end of the swirling gas pipeline, so that inert gas is conveyed into the drip-type crucible through the obliquely arranged swirling gas pipeline; applying uniform pressure to the reaction product in the molten state in the dripping type crucible, so that the reaction product drips out from the bottom of the dripping type crucible; the problem that in the prior art, the pressure applied to the to-be-reacted material is not uniform due to airflow formed by conveying inert gas into the to-be-reacted material is solved.

The invention discloses a preparation method of a magnet based on electrocoppering composite diffusion source evaporation diffusion, the preparation method is used for preparing the magnet based on electrocoppering composite diffusion source evaporation diffusion, the preparation method comprises the following steps: S1, diffusion source preparation: the diffusion source is Dy or Tb, and the purity of Dy and Tb is 99.5%; s2, preparing a pre-diffused magnet matrix; s3, electrocoppering treatment is conducted, specifically, electrocoppering treatment is conducted on the surface of the pre-diffused magnet base body, an electroplating anode is pure copper, the purity is 99.9%, an electroplating solution is a copper sulfate solution, the concentration is 99.9%, and the thickness of a copper plating layer is 2.5-3 microns; and S4, evaporation diffusion: putting the pre-diffused magnet matrix subjected to electro-coppering treatment and a diffusion source into an evaporation furnace together for evaporation diffusion, and separating the magnet matrix subjected to evaporation diffusion from the diffusion source after the evaporation diffusion is completed. According to the invention, the consistency of the performances of different batches of products is ensured, and the material cost of the diffusion source is reduced.

The utility model discloses a static mixer which comprises spiral sheets and a powder pipe, a plurality of spiral sheets are respectively connected end to end in pairs to form a static mixing part, two adjacent spiral sheets are respectively connected in a crossed manner through corresponding bottoms and tops, and the static mixing part is connected in the powder pipe. The powder mixing device has the beneficial effects that the plurality of spiral sheets are respectively connected end to end in pairs to form the static mixing part, and the two adjacent spiral sheets are respectively connected in a crossed manner through the corresponding bottoms and tops, so that powder can smoothly enter the tops of the spiral sheets at the lower end from the bottoms of the spiral sheets at the upper end; the powder to be mixed begins to slide down from the top of the static mixing part and is sequentially mixed by each spiral piece connected with the static mixing part in the sliding-down process, rotary mixing is replaced, the problems of particle segregation and component segregation during powder mixing are prevented, the uniformity of the mixed powder is guaranteed, and then the quality of a printed finished product is guaranteed.

The application relates to the field of cupronickel materials, and particularly discloses a new type of cupronickel suitable for a MIM process and a forming process thereof. Metal powder raw materials include the following mass percentages: Ni 12-18%, Sn 0.6-1.0%, mixed lanthanum-cerium-praseodymium rare earth 0.6-1.0%, Cu 80.4-86.4%, and the balance of Fe and inevitable impurities. When the material is used as a whole, the oxidation resistance of the new material in a catalytic degreasing process can be significantly improved, and the material loss in a sintering process is also greatly reduced, so that the inherent shortcomings of traditional cupronickel are overcome, and various cupronickel products with complex shapes can be perfectly produced through the MIM technology.

The invention relates to the technical field of manufacturing processes of spheroidal graphite castings, and particularly discloses a spheroidal graphite cylinder body and a preparation method thereof.The preparation method comprises the steps that S1, spheroidal graphite cast iron foundry returns, pig iron and waste steel are weighed according to the proportion, and raw materials are obtained; s2, the raw materials are fed into a smelting furnace to be heated, a carburant and silicon carbide are added in the smelting process, and molten iron is prepared; s3, the molten iron is overheated and then poured into an iron ladle, and silicon barium is added; s4, laying a low-rare earth nodulizing agent, a silicon-barium nucleating agent and broken steel sheets in the casting ladle in a layered manner, and pouring molten iron in the iron ladle into the casting ladle; in the discharging process of the molten iron, antimony ingots are put into the casting ladle, and spheroidized molten iron is obtained; s5, deslagging the spheroidized molten iron, then pouring the spheroidized molten iron into a casting mould, and adding a sulfur-oxygen-cerium nucleating agent along with flow to obtain a cylinder body; the problems of intergranular slag inclusion and intergranular shrinkage porosity existing in a metallographic phase can be solved, the problem of composition segregation is prevented, and the number of graphite nodules and the uniformity are effectively improved; and stable production with as-cast performance is realized, and the product percent of pass of cylinder body production is improved.

The invention discloses a preparation method of a magnet based on electroplated copper composite diffusion source evaporation diffusion, the preparation method is used to prepare a magnet based on electroplated copper composite diffusion source evaporation diffusion, comprising the following steps: S1: diffusion source preparation: the diffusion source is Dy or Tb, wherein the purity of Dy and Tb is 99.5%; S2: preparation of a pre-diffused magnet substrate; S3: electroplating copper treatment: electroplating copper treatment is performed on the surface of the pre-diffused magnet substrate, wherein the electroplating anode is pure copper with a purity of 99.9%, the electroplating solution is a copper sulfate solution with a concentration of 99.9%, and the thickness of the copper plating layer is 2.5-3 μm; S4: evaporation diffusion: the pre-diffused magnet substrate treated with electroplated copper is placed in an evaporation furnace together with the diffusion source for evaporation diffusion, and after the evaporation diffusion is completed, the magnet substrate that has completed evaporation diffusion is separated from the diffusion source. The invention ensures the consistency of performance of different batches of products and reduces the material cost of the diffusion source.

This application discloses a molybdenum-containing steel and its smelting method. The smelting method includes hot metal pretreatment, converter smelting, converter tapping, LF furnace refining, and continuous casting. Utilizing the scouring effect of blast furnace hot metal and the carbon element in the blast furnace hot metal, the molybdenum element in the first molybdenum oxide raw material is reduced to obtain molybdenum-containing hot metal. In the converter tapping process, a second molybdenum oxide raw material is added to the bottom of the ladle, and then the molten steel is poured into the ladle. During the pouring process, a deoxidizer is added, and argon gas is blown into the bottom of the ladle for stirring, thus obtaining molten steel. In the LF furnace refining process, the molten steel is heated, and the argon gas flow rate in the ladle is increased to promote the complete reduction of molybdenum from the molybdenum oxide in the molten steel. The molten steel is then fed into the LF furnace, where a ferromolybdenum alloy is added to fine-tune the molybdenum content to achieve the target value, resulting in finely tuned molten steel. The technical solution of this application can reduce the manufacturing cost of molybdenum-containing steel while ensuring its performance.

The invention discloses a method for producing H08A semi-killed low-silicon welding rod steel by adopting a small square billet process, and belongs to the technical field of ferrous metallurgy. The method comprises the four procedures of converter smelting, LF refining, continuous casting and rolling, by optimizing the technological parameters of all the procedures, precise control over the silicon content and effective removal of inclusions are achieved, and the product quality stability is improved; the sulfur content and the phosphorus content are both smaller than or equal to 0.030%, the inclusion rating is smaller than or equal to 1.5 grade, and the purity of the welding rod steel is improved; the silicon mass fraction is stabilized at 0.03-0.07%, and the problem that the welding performance is poor due to the fact that the silicon content in a traditional process exceeds the standard is solved.