C/C composite material with surface coating and preparation method thereof: Fid-Bau Portal

C/C composite material with surface coating and preparation method thereof

LIU RONGJUN / WANG LUYAN / WANG YANFEI / LI DUAN / MIAO HUAMING

The invention provides a C/C composite material with a surface coating and a preparation method thereof, the C/C composite material is used as a matrix, and the surface of the C/C composite material comprises a relief layer and an anti-oxidation layer from inside to outside; the relieving layer comprises the components of silicon carbide, free silicon, boric oxide and silicon oxide, and the thickness of the relieving layer is 40-90 microns; the components of the anti-oxidation layer comprise a boron oxide glass phase and ceramic particles, the ceramic particles comprise hafnium diboride, silicon oxide, aluminum oxide, silicon carbide and molybdenum disilicide, and the thickness of the ceramic particles is 80-200 microns; the density of the C/C composite material matrix is 0.4-0.8 g/cm < 3 >. The preparation method comprises the steps that the relieving layer is obtained on the surface of the base body through brush coating and siliconizing processes, after pre-oxidation treatment, the anti-oxidation layer is obtained on the surface through a brush coating-sintering method, and due to the fact that the anti-oxidation layer contains the ceramic microparticles and the boron oxide glass phase, the coating is compact after being sintered.

本发明提供了一种具有表面涂层的C/C复合材料及其制备方法，产品以C/C复合材料为基体，表面从里向外包括缓解层和抗氧化层；缓解层的成分包括碳化硅、游离硅、氧化硼和氧化硅，厚度为40～90μm；抗氧化层的成分包括氧化硼玻璃相和陶瓷颗粒，陶瓷颗粒包括二硼化铪、氧化硅、氧化铝、碳化硅和二硅化钼，厚度为80～200μm；C/C复合材料基体的密度为0.4～0.8g/cm3。制备方法是先用刷涂和渗硅工艺在基体表面获得缓解层，预氧化处理后，用刷涂‑烧结的方法在表面获得抗氧化层，抗氧化层因含有陶瓷微颗粒和氧化硼玻璃相，涂层烧结后较为致密。

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