5results about How to "Will not oxidize" patented technology

The invention relates to the technical field of preparation of silicon carbide ceramics, in particular to an in-situ reaction sintered silicon carbide ceramic and a preparation method thereof.The preparation method comprises the following technological stages which are conducted in sequence: S1, preparation of silicon carbide slurry, specifically, organic matter precursor raw materials are weighed according to the mass content percentage to form the silicon carbide slurry; s2, vacuum grouting: injecting the silicon carbide slurry in the vacuum grouting tank into the shaping mold from the bottom of the shaping mold to form a silicon carbide green body; and S3, in-situ reaction sintering is conducted, specifically, the silicon carbide green body is placed in a sintering furnace, heating, heat preservation and cooling are conducted on the silicon carbide green body in the argon atmosphere through a segmented temperature control technology, and the silicon carbide ceramic is obtained. The silicon carbide ceramic prepared by the method disclosed by the invention has relatively high density and excellent mechanical properties.

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

This invention discloses a method for infiltrating ultra-low chromium copper into copper-tungsten contact materials using a vacuum sintering process, comprising the following steps: S1, pressing tungsten powder into a blank; S2, degumming the tungsten blank; S3, preparing the copper matrix; S4, unloading the blank; S5, sintering and infiltrating; and S6, solution treatment and aging. In the copper-tungsten contact material infiltrated with ultra-low chromium copper using the vacuum sintering process of this invention, the Cr content is approximately 0.025 wt.%. This ultra-low Cr content provides excellent strengthening of the contact material, resulting in a hardness ≥78 HB and a conductivity ≥55 Ms / m, thus compensating for the insufficient conductivity of chromium copper while meeting the hardness requirements of copper.

The utility model discloses a lithium battery quick -witted interface suitable for logistics car, including installation panel, installation panel front side is provided with quick -witted interface, installation panel front side four corners all are provided with fixed screw, quick -witted interface front side is provided with the charging gun who is compatible with it, still be provided with between the installation panel and charging gun limit mechanism, the limit mechanism includes the L shape board at quick -witted interface top, the one end fixedly connected with pivot of L shape board close to installation panel, both ends of pivot all are connected with the side plate that rotates, through having designed installation panel, quick -witted interface, fixed screw, charging gun, limit mechanism, make quick -witted interface when using, the connection between charging gun and quick -witted interface is more fastening, will not because of the pulling of external force, lead to charging gun easily from quick -witted interface inside drop, make the connection between charging gun and quick -witted interface more stable, have guaranteed the quality of charging is better, and the whole structure is simple, and the practicality is strong.

The application discloses an antibacterial and wound healing promoting nanocomposite film as well as a preparation method and application thereof. The nanocomposite film is obtained by repeatedly freezing and thawing a mixed solution of polyvinyl alcohol, lignin and MXene to form a crosslinked network. The mass ratio of the polyvinyl alcohol, the lignin and the MXene is 1:4:(0.0025-0.04). The application introduces MXene and LS into a PVA hydrogel system, endows the composite film with good mechanical properties, biocompatibility and antibacterial activity, and the composite film has moderate swelling performance and conductivity. The nanocomposite film of the application is non-toxic and has good chemical stability. The nanocomposite film can promote wound healing, significantly reduce inflammatory response, promote the formation of new blood vessels, strengthen nutrient transport, and can be combined with electric stimulation to further promote wound healing, and has a broad application prospect in the field of wound dressings.