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HfB2-SiC-MoSi2 oxidation resistance coating fabricated through in-situ synthesis for SiC coated C/C composites

机译:原位合成HfB2-SiC-MoSi2抗氧化涂层的SiC涂层C / C复合材料

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摘要

A brand new HfB2-SiC-MoSi2 coating was fabricated to protect carbon/carbon (C/C) composites with inner SiC coating from oxidation, which was prepared by in-situ synthesis. In this paper, the C/C substrate with the protection of the HfB2-SiC-MoSi2/SiC coating could resist oxidation in 1773 K air for 408 h. The double coating also presented expected oxidation protection performance at dynamic oxidation environment. In the test process, the surface coating was oxidized to form a self-sealing silicate glass layer containing HfO2 and HfSiO4, which could hinder crack propagation in coating.
机译:制造了一种全新的HfB2-SiC-MoSi2涂层,以保护具有内部SiC涂层的碳/碳(C / C)复合材料免于氧化,该涂层是通过原位合成制备的。在本文中,具有HfB2-SiC-MoSi2 / SiC涂层保护的C / C基板可以在1773 K空气中抵抗408小时的氧化。双层涂层还表现出在动态氧化环境下的预期氧化保护性能。在测试过程中,表面涂层被氧化以形成包含HfO2和HfSiO4的自密封硅酸盐玻璃层,这可能会阻碍涂层中的裂纹扩展。

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