Preparation and Anti-oxidation Behavior of Si-C-B Self-healing Coating on C/SiC Composite

doi:10.3724/SP.J.1077.2008.00774

Abstract

Abstract: Modification of SiC coating was carried out with B and BC_x prepared by chemical vapor deposition(CVD), SiC/B/SiC and SiC/BC _x/SiC multi-layer self-healing coatings were prepared on a two-dimensional C/SiC composite. The surface and cross section morphologies of the multi-layer coatings were analyzed by SEM. Oxidation were carried out in static air at 700℃. The results show that the B₂O₃ glass produced by oxidation of B or BC_x can seal the cracks existed in the coating well, the kinetics of oxidation is controlled by
diffusion of oxygen through the micro-cracks and B₂O₃ glass layer; SiC/BC _x/SiC-C/SiC composites have lower weight loss during the oxidation
and higher strength retention after oxidized for 10h.

Key words: chemical vapor deposition(CVD), B, BC_x, self-healing coating, oxidation behavior

CLC Number:

TB332

ZHANG Wei-Hua,CHENG Lai-Fei,ZHANG Li-Tong,YANG Wen-Bin,LIU Yong-Sheng,XU Yong-Dong. Preparation and Anti-oxidation Behavior of Si-C-B Self-healing Coating on C/SiC Composite[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00774.

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Preparation and Anti-oxidation Behavior of Si-C-B Self-healing Coating on C/SiC Composite

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