2results about How to "Increase service temperature" 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.

A high-temperature, high-strength zirconium alloy and its manufacturing method are disclosed, belonging to the field of nuclear engineering materials. The high-temperature, high-strength zirconium alloy comprises, by weight: 1%-10% Sn, 0.1%-1% O, 0.01%-3.5% Al, and 0.01%-0.5% Si and / or 0.01%-0.5% Ge, with the remainder being Zr and unavoidable impurities. In this high-temperature, high-strength zirconium alloy, Si and / or Ge can form thermodynamically stable precipitates at high temperatures, promoting grain refinement while pinning α-Zr grain boundaries at high temperatures, inhibiting solid-state phase transformation and grain growth in the zirconium alloy matrix at high temperatures, thus enabling the alloy to maintain good mechanical properties and microstructural stability at high temperatures.