7results about How to "Guaranteed compositional uniformity" patented technology

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 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.

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.

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.