A SiCf / SiC composite material with ultra-high temperature ceramic gradient coating, its preparation method and application

By preparing a (Hf,Si,Ta)C gradient coating in SiCf/SiC composite material, the problems of weak bonding strength and poor self-healing ability were solved, enabling long-term stable service and self-repair of the material at high temperatures, and improving the high-temperature protection performance of aerospace materials.

CN118684526BActive Publication Date: 2026-06-02NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2024-05-21
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

The SiCf/SiC composite material is prone to the formation of discontinuous SiO2 acidic oxide scale on its surface at high temperatures, which leads to the overall failure of the material. In addition, the existing ultra-high temperature ceramic coatings have limited lifespan at high temperatures, weak bonding strength, and poor self-healing ability.

Method used

A 10–40 μm thick (Hf,Si,Ta)C gradient coating was prepared using a double-layer glow discharge plasma surface metallurgy method. By diffusing Hf and Ta atoms into the SiCf/SiC composite material, HfC, TaC, and SiC compounds were formed, exhibiting high bonding strength and self-healing ability.

Benefits of technology

The service temperature of SiCf/SiC composite material has been increased to 1773K, reducing the risk of coating peeling and cracking at high temperatures, extending service life, and providing good high-temperature protection performance.

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Abstract

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.
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