13results about How to "Good composition uniformity" patented technology

This invention belongs to the field of copper alloy material design and preparation technology, and discloses a new process for efficiently designing high-performance copper-iron alloys. Based on the 5% Fe content vertical cross-sectional characteristics of the Cu-Fe-Si ternary phase diagram, the Si content is designed in stages (0-4%) to achieve targeted performance optimization. Combined with a three-stage heat treatment process of "homogenization-basic aging-gradient aging", a closed-loop system of "phase diagram design-preparation-detection-optimization" is constructed. Through precise composition control by EPMA and real-time feedback of mechanical properties, the problems of blind composition design and insufficient precipitation of strengthening phases in traditional processes are solved. The resulting alloy has excellent tensile strength, yield strength, and total elongation at break, with synergistic improvement in mechanical and magnetic properties, and a design efficiency improvement of more than 40%, making it suitable for electronic, mechanical and other fields.

The application provides a preparation method of a copper-gallium target material, comprising the following steps: taking high-purity copper blocks and high-purity gallium as raw materials to perform vacuum smelting, the content of gallium in the raw materials is 35-55 wt.%, after the smelting is completed, the copper-gallium alloy is obtained by casting into a mold and cooling; the temperature of the vacuum smelting is 800-900 DEG C; the copper-gallium alloy is sprayed to prepare powder, and the copper-gallium alloy powder is obtained; the copper-gallium alloy powder is subjected to hot isostatic pressing and cooling, and the copper-gallium target material is obtained. The copper-gallium target material with high density and good uniformity of components is prepared by the following steps: first, a high-gallium copper-gallium alloy is prepared by using a vacuum casting method, then, alloy powder is prepared by using a gas spraying method, and finally, the copper-gallium target material is prepared by hot isostatic pressing sintering and annealing.

An aluminum alloy die-casting process for improving the uniformity of the composition of die-castings relates to the technical field of aluminum alloy casting processing. A low-pressure die-casting process is used to inject an aluminum-based melt with uniform composition into a cavity, and the melt in the die-casting cavity is heated and heated to ensure that the precipitated phase Mg2Si is dissolved into the aluminum-based melt. After that, the melt is kept warm to ensure that the melt is filled densely. Subsequently, a water-cooled active cooling technology is used to accelerate the solidification speed, shorten the time between the precipitation of the Mg2Si dispersed phase and the solidification of the aluminum alloy, inhibit the floating of the Mg2Si dispersed phase, and improve the uniformity of the composition of the aluminum alloy die-casting. In addition, a short insulation is performed near the solidification temperature line, and then water-cooling is performed to slowly cool, thereby ensuring the density of the aluminum alloy die-casting. The present invention can greatly improve the uniformity of the composition of the aluminum alloy die-casting while ensuring the aluminum alloy die-casting, thereby achieving the improvement of the performance of the aluminum alloy die-casting and ensuring the efficient and stable production of the aluminum alloy die-casting.

This invention discloses a method for preparing high-purity rare-earth ferrosilicon alloys, belonging to the field of pyrometallurgical technology. Addressing the stringent purity requirements (oxygen content ≤50ppm, sulfur content ≤100ppm) for rare-earth ferrosilicon alloys in high-end manufacturing, and the technical challenges of deep removal of impurities and poor compositional uniformity in existing preparation processes, this invention provides a method for preparing high-purity rare-earth ferrosilicon alloys integrating "deep raw material purification - multi-stage vacuum refining - directional solidification purification - application-oriented compositional control". The method includes: preparing an intermediate alloy using high-purity rare-earth oxides, high-purity silica, and steel scrap as raw materials through carbothermic reduction; placing the intermediate alloy in a vacuum induction melting furnace and performing multi-stage refining under a vacuum of ≤10Pa, selectively removing volatile impurities through segmented temperature control; performing deep deoxidation and desulfurization using composite refining agent injection technology; achieving interfacial segregation separation of impurity elements through directional solidification technology; and finally, performing atmosphere-protected annealing and compositional fine-tuning according to the target application field. Based on the multi-stage synergistic purification mechanism of "thermodynamic selective volatilization-kinetic spray reaction-crystal growth interface segregation", the rare earth ferrosilicon alloy prepared by this invention has an oxygen content of ≤45ppm, a sulfur content of ≤80ppm, and a rare earth element distribution non-uniformity of ≤±2%, which meets the application requirements of high-end fields such as aerospace high-temperature alloys, nuclear reactor control materials, and semiconductor sputtering targets.

The invention relates to the technical field of battery materials, in particular to a porous carbon composite material and a preparation method thereof, a negative pole piece and a solid-state battery. The preparation method of the porous carbon composite material comprises the following steps: preparing a metal ion salt solution A containing a lithium source, a lanthanum source and a zirconium source, and preparing a precipitant solution B containing a precipitant; mixing the metal ion salt solution A, the precipitant solution B and the porous carbon material, so that the lithium source, the lanthanum source, the zirconium source and the precipitant are uniformly distributed in pores of the porous carbon material to obtain a precursor solution C; enabling a lithium source, a lanthanum source and a zirconium source to react with a precipitator through a coprecipitation method to generate lithium lanthanum zirconium oxide, and depositing the lithium lanthanum zirconium oxide in pores of the porous carbon material to obtain the porous carbon composite material. After the porous carbon composite material prepared by the invention is prepared into a negative pole piece and is assembled into a solid-state battery, the solid-state battery shows the advantages of high discharge capacity, good cycle performance, low interface internal resistance and high safety, and large-scale industrial application of the solid-state battery is facilitated.

This invention relates to the field of alloy cold heading steel production technology, and discloses a pearlitic phase transformation process for alloy cold heading steel that reduces or eliminates annealing. The process includes S1 precise composition design, S2 converter smelting stage, S3 LF refining stage, S4 vacuum treatment stage, S5 continuous casting stage, S6 rolling stage, S7 core controlled cooling stage for pearlitic phase transformation, S8 heat preservation and channel strengthening stage, and S9 process monitoring and closed-loop adjustment. This process achieves sufficient pearlitic phase transformation and significant suppression of harmful phases: by precisely controlling the cooling rate at 0.25-1.0℃ / s in the core controlled cooling stage, combined with heat preservation synergy within the 620-746℃ pearlitic phase transformation range, the pearlitic content of the steel is stably maintained at ≥85%, the bainite content ≤5%, and the martensite content ≤2%, completely solving the problem of excessive hardness caused by excessive harmful phases in traditional processes, and providing core microstructure protection for reducing or eliminating annealing.

This invention discloses a large-size molybdenum-titanium alloy target and its preparation method. The preparation method includes the following steps: S1, selecting raw materials molybdenum powder and titanium powder; S2, granulating the molybdenum powder under inert gas protection to prepare granulated molybdenum powder, wherein the particle size and tap density of the granulated molybdenum powder are matched with those of the titanium powder; S3, mixing the granulated molybdenum powder and titanium powder in a certain proportion under inert gas protection; S4, degassing the mixed powder; S5, hot isostatic pressing to form an ingot; S6, vacuum heat treatment of the ingot to obtain the large-size molybdenum-titanium alloy target. By adding the granulation and forming process of molybdenum powder, the morphology of the raw materials is controlled, effectively suppressing the tendency of the mixed powder to separate in subsequent processing. This method significantly improves the compositional uniformity and batch stability of the molybdenum-titanium alloy target, avoids product defects and scrap due to separation, thereby reducing production costs and improving product qualification rate.

This invention provides a copper-zinc-tin-sulfur-selenium thin film, its preparation method, and a semiconductor device thereof. The preparation method includes: fully dissolving at least one metal source of copper, zinc, tin, sulfur, and selenium in a ligand solvent; then adding a main solvent, other metal sources, and a sulfur or selenium source; and thoroughly mixing to obtain a copper-zinc-tin-sulfur-selenium precursor solution based on a mixed solvent system. The ligand solvent is a small-molecule solvent with carbonyl or amine coordinating groups that provide lone pairs of electrons to metal cations. The precursor solution is then coated onto a substrate surface to prepare a precursor thin film. The precursor thin film is further subjected to post-selenization or post-sulfurization treatment to obtain the copper-zinc-tin-sulfur-selenium thin film. By introducing a small-molecule solvent with specific coordination ability to form discrete metal-ligand structural units with the metal precursor, metal clusters or oxygen bridge network structures are effectively suppressed. High homogenization of the precursor solution is achieved at the molecular scale, significantly improving the thickness and compositional uniformity of the copper-zinc-tin-sulfur-selenium precursor thin film.

The invention relates to the technical field of sputtering target material preparation, and provides a spraying plane target material, a preparation method thereof and a piezoelectric sensor, and the preparation method of the spraying plane target material comprises the following steps: providing a plane target material substrate; target material powder is thermally sprayed to the to-be-sprayed face of the plane target material base body, a target material layer is formed, and then a sprayed plane target material is obtained through machining; wherein the to-be-sprayed surface comprises a slope surface structure, and the horizontal height of the slope surface structure is gradually reduced from the center to the periphery. According to the preparation method, a thermal spraying mode is adopted, long-time high-temperature sintering is not needed, energy consumption and cost can be reduced, and production efficiency can be improved. And warping caused by thermal stress of the target material layer is made up through the slope surface structure of the planar target material base body, the surface smoothness of the target material layer of the planar target material is improved, and the sputtering uniformity of the planar target material serving as a sputtering target material can be improved.

The invention discloses a titanium alloy forge piece which is composed of, by mass, 4.0%-5.5% of Al, 0.3%-0.6% of Fe, 2.5%-3.4% of V, 7.5%-8.5% of Cr and the balance Ti. Sponge titanium, iron-chromium intermediate alloy, iron blocks, aluminum shots and titanium dioxide are mixed and then pressed to obtain electrode blocks, the pressed electrode blocks are installed and welded, three times of vacuum self-consuming electric arc smelting is adopted, and the titanium alloy forge piece is obtained. Two-heating-number cogging forging is conducted, a primary forging blank is heated to the process temperature for multi-heating-number modified forging, multi-heating-number modified forging is conducted on an intermediate forging blank when the temperature is lower than the phase transformation point, and after-forging solution treatment and aging treatment are conducted on the obtained forge piece; the titanium alloy forge piece is reasonable in design, the alloy performance is optimized and improved by reasonably controlling the content of all alloy elements, and the titanium alloy forge piece has the advantages of being high in strength, high in heat resistance, good in oxidation resistance and corrosion resistance and the like and is suitable for manufacturing parts with high performance requirements.

This invention relates to the field of lithium-ion battery cathode material technology, specifically a high-performance lithium-rich manganese-based cathode material based on pretreated boron nitride, its preparation method, and its application. The preparation method includes: introducing hydroxyl and amino groups onto the surface of boron nitride nanosheets; preparing a composite precursor powder by mixing a nickel-cobalt-manganese hydroxide precursor, a lithium source, TiO2, a phosphorus source, and pretreated boron nitride; sequentially performing conventional pre-calcination, a first-segment Joule heat treatment, and a second-segment Joule heat treatment; performing a third-segment instantaneous Joule heat treatment, followed by quenching; by introducing a surface-functionalized high thermal conductivity boron nitride network into the bulk phase of the material, and combining a programmed sequential heat treatment of "pre-calcination-two-segment Joule heat treatment" with instantaneous surface melting and quenching, this method effectively solves the inherent thermal gradient problem of the Joule heating method, simultaneously achieving high bulk phase homogenization and surface stabilization, resulting in a product with excellent comprehensive electrochemical performance.

The invention discloses a molybdenum-copper alloy plate resistant to molten salt corrosion. The molybdenum-copper alloy plate is composed of, by mass, 15%-40% of Cu, smaller than or equal to 0.003% of C, smaller than or equal to 0.006% of O, smaller than or equal to 0.003% of N and the balance Mo and inevitable impurities. The preparation method comprises the following steps: 1, weighing the high-purity raw materials according to the required proportion; 2, ball-milling and powder mixing of the raw materials; 3, pressing into a block body by a cold isostatic press; 4, performing hydrogen sintering to obtain a cast ingot; 5, rolling into a plate blank at low temperature; and 6, annealing to obtain the plate. Molybdenum serves as a base body, copper serves as a main alloy element, a powder metallurgy method is combined with low-temperature rolling and annealing treatment, the accuracy and uniformity of molybdenum-copper alloy components are guaranteed, the molybdenum-copper alloy plate has good mechanical performance and machining performance, meanwhile, the molybdenum-copper alloy plate has excellent molten salt corrosion resistance, and the service life of the molybdenum-copper alloy plate is prolonged. And the use condition of the molten salt reactor structure material is met.

The present invention relates to the field of aluminum alloy processing, specifically to a high-strength semi-solid die-cast aluminum alloy and a preparation method. The present invention first mixes a silicon source, a magnesium source, a copper source, an aluminum source, a titanium source, a vanadium source, and an antimony source, heats and melts them to a liquid state, and obtains a liquid aluminum alloy; graphene oxide and boric acid are used as raw materials, mixed and prepared at a high temperature to obtain boron-doped graphene, the boron-doped graphene is dispersed in ethylene glycol, cerium nitrate is added, and cerium oxide is loaded on the surface of the boron-doped graphene by a hydrothermal synthesis method to obtain boron-doped graphene loaded with cerium oxide; then boron-doped graphene loaded with cerium oxide is added to the liquid aluminum alloy to obtain an aluminum alloy semi-solid slurry; then the aluminum alloy semi-solid slurry is die-casted, and after solution treatment, water quenching and aging treatment, high-strength semi-solid die-cast aluminum alloy is obtained by furnace cooling. The semi-solid die-cast aluminum alloy prepared by the present invention has the advantages of high strength and good plasticity.