Method for preparing silicon carbide coating on surface of carbon-carbon composite material: Fid-Bau Portal

Method for preparing silicon carbide coating on surface of carbon-carbon composite material

ZHU SUHUA / SHEN YISHUN

The invention discloses a method for preparing a silicon carbide coating on the surface of a carbon-carbon composite material, and belongs to the field of inorganic functional coatings. The method comprises the following steps: densifying a carbon fiber preform to obtain a carbon-carbon composite material with the density of 1.0-2.0 g/cm<3>, then carrying out surface carbon deposition pretreatment on the carbon-carbon composite material, then carrying out chemical vapor silicon deposition under silicon source gas to obtain a carbon-carbon composite material with the surface covered with silicon, finally carrying out heat treatment, and obtaining the carbon-carbon composite material containing the silicon carbide coating; wherein the silicon source is selected from at least one of SiH4, SiH3Cl, SiH2Cl2, SiHCl3 and SiCl4. The silicon carbide coating is simple and easy to prepare, and is suitable for preparing the silicon carbide coatings on the surfaces of the carbon-carbon composite materials with different shapes and structures; the silicon carbide coating prepared by the method is uniform and compact, and is firmly combined with the carbon-carbon composite material body, so that the service life of the carbon-carbon composite material under various working conditions is greatly prolonged.

本发明公开了一种在炭炭复合材料表面制备碳化硅涂层的方法，属于无机功能涂层领域。包括以下步骤：将碳纤维预制体进行增密获得密度为1.0～2.0g/cm3的炭炭复合材料，再将炭炭复合材料进行表面沉积碳预处理，然后于硅源气体下进行下化学气相沉积硅，获得表面覆盖硅的炭炭复合材料，最后进行热处理，即得含碳化硅涂层的炭炭复合材料；所述硅源选自SiH4，SiH3Cl，SiH2Cl2,SiHCl3，SiCl4中的至少一种。本发明碳化硅涂层制备简单易行，适用于不同形状结构的炭炭复合材料表面碳化硅涂层制备；采用本发明制备的碳化硅涂层均匀致密，并与炭炭复合材料本体结合牢固，大大提高了炭炭复合材料在各种工况条件下服役寿命。

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