15results about How to "Guaranteed compositional uniformity" patented technology

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 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 the field of secondary batteries, in particular to a sodium ion battery composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: preparing a layered transition metal oxide positive electrode material, mixing the layered transition metal oxide positive electrode material with a polyanion raw material, spray-drying, sintering and the like. Compared with the prior art, the preparation method has the advantages that the layered transition metal oxide positive electrode material is synthesized firstly, the layered transition metal oxide positive electrode material and the polyanion raw material are mixed in the early stage, and the spray drying technology is adopted, so that the two materials can be uniformly dispersed on the microscopic level; the uniform distribution is maintained in the subsequent sintering process, the phase splitting and segregation phenomena of the material are prevented, the component uniformity of the composite positive electrode material is ensured, and the prepared sodium ion battery has higher compaction density, high capacity, high energy density and more stable performance during use.

The utility model discloses mixing equipment capable of uniformly mixing for magnesium-calcium brick raw material processing, which comprises a mixing box and a crushing box, the crushing box is arranged above the mixing box, the output end of a large gear is fixedly connected with a first crushing roller, the output end of a small gear is fixedly connected with a second crushing roller, and the output end of the small gear is fixedly connected with a second crushing roller. And one side of the first gear is fixedly connected with a first stirrer, and one side of the second gear is fixedly connected with a second stirrer. Through the arrangement of the first crushing rollers and the second crushing rollers, the number of the second crushing rollers is two, and the three crushing rollers have a synergistic effect, so that large particles and cakes in magnesia-calcium brick raw materials can be effectively crushed into smaller particles, the specific surface area of the raw materials is increased, the mixing effect is improved, and the mixing efficiency is improved. And the crushed raw material particles are easier to uniformly distribute in the mixing process, the contact area between the small particles is increased, and the mixing efficiency is improved, so that the component uniformity of the magnesia-calcium brick product is ensured.

The invention belongs to the technical field of bar production, and particularly relates to a production method of a steel bar for a heavy-load automobile half axle, and the steel bar comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.25-0.35% of Si, 1.45-1.70% of Mn, less than or equal to 0.013% of P, less than or equal to 0.006% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, 0.15-0.20% of Mo, 0.06-0.10% of V, less than or equal to 0.15% of Cu and the balance of Fe and inevitable impurities. The method has the advantages that high-performance, high-purity and low-cost production of the steel bar for the heavy-duty automobile half shaft is realized through green short-process production of'ecological electric furnace + LF + RH + continuous casting 'in combination with low-carbon component design and a controlled rolling and controlled cooling process. And macrostructures and non-metallic inclusions of the finished steel meet the requirements of high-end products.

The invention discloses metal ceramic spraying powder and a preparation method thereof, and relates to the technical field of metal ceramic powder spraying materials. The metal ceramic spraying powder comprises one or more of titanium carbonitride, titanium carbide and titanium nitride; the metal ceramic spraying powder disclosed by the invention is uniform in component and has excellent sphericity, so that the spraying powder is good in flowability, and an obtained coating is good in stability; the coating formed by the spraying powder and the matrix metal surface layer is high in binding force, the advantages of corrosion resistance, high temperature resistance, low porosity, high density, high red hardness and the like are also achieved, and the preparation method is simple, easy to implement, low in cost and easy for mass production.

The invention provides a high-strength aluminum profile hot extrusion forming method, and relates to the technical field of aluminum profile machining. The hot extrusion forming method for the high-strength aluminum profile comprises the steps that a blank is prepared, a proper aluminum alloy material is selected, inclusions in the raw material are removed, the raw material is cut into the required length and shape, heating smelting treatment is conducted, and the temperature suitable for extrusion is achieved while it is guaranteed that components are uniform. By optimizing the smelting process and adopting advanced smelting technologies such as electromagnetic stirring and vacuum smelting, the component uniformity of molten aluminum is ensured, parameters such as smelting temperature, time and stirring speed are strictly controlled, alloy elements are fully dissolved and uniformly distributed, raw material inspection is enhanced, and raw materials are strictly inspected and screened, so that the production cost is reduced, and the production efficiency is improved. The aluminum ingots containing the inclusions are removed, and before smelting, the aluminum ingots can be pretreated, such as cleaning and preheating, so that the introduction of the inclusions is reduced.

The application provides a diamond multi-blade contour forming tool and a preparation method thereof, V is partially replaced by Nb, the content of V is strictly controlled, high-hardness VC is replaced by low-hardness NbC, and the grain boundary is purified and the carbide is refined by rare earth Ce, so that the grinding performance is multiplied compared with existing high-speed steel, the industry pain point that high hardness and easy grinding cannot be achieved at the same time is solved, and the machining difficulty and production cost of complex multi-blade contour are greatly reduced. The uniformity of the base body composition is ensured by vacuum melting + electroslag remelting, the coarse carbide is broken by multi-directional forging, the strength and toughness balance is realized by sectional preheating precise quenching + three times tempering, the high-strength combination of the PCD composite sheet and the tool body is realized by vacuum brazing, the contour precision control within ± 2 mu m is realized by five-axis precision grinding, and the forming tool perfectly adapts to the high-precision machining demand of the complex special-shaped structural part of consumer electronics.

The application discloses a method for producing high-quality and low-cost titanium and titanium alloy ingot, which comprises the following steps: step one, pressing raw materials into electrode blocks by an oil press; step two, assembling and welding the electrode blocks in a vacuum welding box to obtain primary welded electrodes; step three, placing blocky returned furnace charges on one side of the primary welded electrodes, and performing secondary welding in the vacuum welding box to obtain final smelted electrodes, and the addition proportion of the returned furnace charges is 50%-85%; and step four, performing twice vacuum smelting by using a vacuum consumable arc furnace to obtain titanium and titanium alloy ingots. By welding the blocky returned furnace charges on one side of the electrode blocks in the vacuum welding box, the method effectively prevents the quality risk of high and low density inclusions caused by manual welding outside the furnace, the addition proportion of the returned furnace charges can reach 50%-85%, the produced ingots can be used in important fields such as aviation, aerospace and ships, high proportion of resource recycling is realized, and the production cost is reduced to the maximum extent.

The invention discloses a method for collaborative resource utilization of landfill leachate and fly ash, and relates to the technical field of hazardous compound treatment, a bucket elevator is included, a fly ash feeding hopper is arranged at the input end of the bucket elevator, and a fly ash conveying pipeline is arranged at the output end of the bucket elevator; fly ash is conveyed into a liquid-ash combination mechanism through a bucket elevator, the bottom end of the liquid-ash combination mechanism is connected with a leachate sealing tank through a water pump, landfill leachate is pumped into the liquid-ash combination mechanism through the water pump, the fly ash pumped into the liquid-ash combination mechanism through the liquid-ash combination mechanism and the leachate are fully fused through the liquid-ash combination mechanism, and brick making raw materials are formed. According to the invention, waste substances are utilized and fused by using the landfill leachate and the fly ash to prepare the brick making raw material, so that waste is turned into wealth, the pressure of subsequent treatment of the landfill leachate and the fly ash and the risk of possible pollution to the environment are reduced, and meanwhile, the cost of the brick making raw material is also reduced; and a new process in the harmful compound treatment field is facilitated.

This invention relates to the field of functional food processing technology, specifically disclosing a functional asparagus powder with high saponin content and its preparation method. The method includes the following steps: asparagus is sliced ​​and microwaved to deactivate enzyme activity; after pulping, a composite regulator aqueous dispersion is added; the pH is adjusted and a cellulose complex enzyme is added for enzymatic hydrolysis; then, it is pre-frozen and vacuum freeze-dried; finally, it is pulverized, sieved, and packaged under a nitrogen atmosphere. The composite regulator can dynamically stabilize and protect saponin molecules through temperature-responsive behavior during processing, significantly reducing thermal degradation. The resulting asparagus powder has a saponin content of 72-85 mg / g and is rich in flavonoids, phenols, and soluble dietary fiber. This product can be used in functional foods that improve sleep. When added at a 4% level to bread, noodles, or meal replacement porridge, animal experiments have verified that it can significantly prolong sleep time and increase the incidence of sleep in mice, exhibiting high nutrient retention and good stability.

The application relates to the technical field of inorganic non-metallic materials, and discloses a high-entropy oxide ceramic and a solid-phase reaction preparation method thereof; the high-entropy oxide ceramic is prepared by using multiple rare earth oxides, alkaline earth metal oxides and transition metal oxides with a purity of greater than or equal to 99.99% as raw materials, through the following steps of raw material pretreatment, chemical stoichiometric ratio batching, wet ball milling mixing, pre-sintering, secondary ball milling, composite forming, internal stress release, normal-pressure sintering densification and the like, and the high-entropy oxide ceramic bulk body with a single-phase solid solution structure, high density and stable performance is prepared. The process route of the application is simple and controllable, the raw material cost is low, no complex equipment is needed, the generation of multiple-component system heterogeneous phases can be effectively inhibited, the powder component uniformity is excellent, the prepared ceramic bulk body has high density, is suitable for large-scale industrial production, and can be widely applied to the fields of electronic information, aerospace, energy catalysis, heat protection and the like.

The utility model belongs to the technical field of reaction kettles, and particularly discloses a reaction kettle for producing desulfurization and denitrification auxiliaries, which comprises a kettle body, and a stirring component is arranged in the kettle body; the stirring assembly comprises a stirring rod, the stirring rod is rotatably connected with the kettle body, and the outer wall of the stirring rod is fixedly connected with a plurality of stirring blades; the outer wall of the stirring rod is fixedly connected with a plurality of connecting plates, a scraping plate is arranged between every two connecting plates, and the plurality of scraping plates are in contact with the inner wall of the kettle body; wherein the two scraping plates are obliquely arranged, an upper cover plate is connected above the kettle body through bolts, and a motor is arranged at the top of the upper cover plate. Through the arrangement of the stirring assembly, the stirring blades and the scraping plates synchronously rotate, not only is the macromixing of materials realized through the stirring blades, but also the materials adhered to the inner wall of the kettle body are continuously scraped through the scraping plates; and dead angles caused by wall sticking of high-viscosity materials in a traditional process are avoided, the uniformity of material components is ensured, and the production quality of the desulfurization and denitrification additive is improved.

The invention discloses a device and method for manufacturing high-entropy alloy through plasma arc multi-wire powder coaxial additive manufacturing, and belongs to the field of electric arc additive manufacturing. The device comprises a plasma arc multi-wire powder coaxial welding gun. The welding gun comprises a copper nozzle with an ion gas port in the middle, a welding gun shell and a powder feeding shell. Wire feeding ports are formed in the front and rear ends of the ion gas outlet; powder feeding ports are formed in the left and right ends of the ion gas outlet; a shielding gas outlet is formed in the outer side of the copper nozzle; the copper nozzle is located at the bottom end of the multi-wire powder coaxial welding gun and connected with the welding gun shell. A second channel between the ion gas shell and the powder feeding shell is used for injecting powder; through holes are formed in the surfaces of the two sides of the welding gun shell and the powder feeding shell correspondingly and used for feeding welding wires, and the welding wires are fed into the wire feeding opening through the second channel. According to the device, through the double wire feeding systems and the coaxial double powder feeding systems, the proportion of multiple main elements can be accurately controlled, the component uniformity and high quality of the high-entropy alloy are ensured, and the device is suitable for batch production and large-scale application of the high-entropy alloy.

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.