3results about How to "Excellent surface hardness" patented technology

This invention discloses a SiC with an ultra-high temperature ceramic gradient coating. f / SiC composite materials, their preparation methods, and applications. A double-layer glow discharge plasma surface metallurgical method is used to prepare SiC composite materials. f A (Hf,Si,Ta)C gradient composite coating was prepared on the surface of the SiC composite material. This coating was able to resist SiC in an oxygen atmosphere at 1773 K. f Effective protection of SiC composite materials. The specific advantages of this invention are: (1) Ion bombardment of the substrate significantly improves the point defects and conductivity of the composite substrate; (2) The (Hf,Si,Ta)C coating has a continuous gradient structure, forming a good metallurgical bond between the coating and the substrate, with high bonding strength; (3) The similar thermal expansion coefficients of the (Hf,Si,Ta)C coating and the substrate can improve the thermal mismatch between the coating and the substrate, reducing the tendency for coating peeling and cracking during service; (4) The (Hf,Si,Ta)C coating system has a high service temperature and self-healing ability. The coating prepared by this invention has excellent high-temperature protection performance, improving the protection of SiC. f The high-temperature service life of SiC composite materials has broad application prospects in the aerospace field.

Examples of the present invention provide multilayer sheets, multilayer electronic devices, etc. The multilayer sheet includes: a transparent film having a total light transmittance of 85% or more according to ISO 13468; a coating disposed on one side of the transparent film; and an adhesive layer disposed on the other side of the transparent film; the thickness of the adhesive layer after curing is less than twice the thickness of the coating. The multilayer sheets and multilayer electronic devices of the present invention do not peel off from the substrate even during repeated folding or rolling, and due to their excellent surface hardness, they exhibit excellent scratch resistance, dent resistance, etc. The multilayer sheets can be used as cover sheets for displays and offer excellent utilization for multilayer electronic devices.

A polycarbonate composite composition is provided that exhibits improved surface hardness while maintaining impact strength. The polycarbonate composite composition comprising polycarbonate and specific ester repeating units according to the invention is characterized by excellent surface hardness while retaining the inherent basic physical properties of polycarbonate.