Oxidation behaviors and mechanisms of CVD Si-B-C ceramic in wet oxygen from 700 °C to 1400 °C

详细信息    查看全文

• 作者：Qing Zhang ; Xinzhang Zuo ; Yongsheng Liu ; ^{yongshengliu@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Litong Zhang ; Laifei Cheng ; Xiaoying Liu ; ^{liuxiaoying5987@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Si-B-C ceramic ; Oxidation behavior ; Oxidation mechanism ; Wet oxygen ; Chemical vapor deposition
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：36
• 期：15
• 页码：3709-3715
• 全文大小：3394 K

文摘

Si-B-C ceramic is an effective self-healing component to improve the oxidation resistance of C/SiC composites for long-life applications in aircraft and aerospace fields. To clarify protection mechanisms, oxidation behaviors and mechanisms of CVD Si-B-C ceramic in wet oxygen from 700 °C to 1400 °C were investigated in this work. Microstructure, bonds transformation and phase evolution of Si-B-C ceramic after oxidation were analyzed. The weight loss of Si-B-C ceramic increased linearly with time between 700 °C and 1000 °C, while it changed in a non-linear way above 1200 °C. The oxidation production of Si-B-C ceramic in wet oxygen is mainly composed of Si(OH)₄, SiO₂, H₃BO₃, B₂O₃ and B₂O. The oxidation resistance of Si-B-C in wet oxygen is better than that of single-phase B₄C ceramic because borosilicate glass is rapidly formed, which can effectively resist the wet oxygen. No fiber oxidation is found up to 1400 °C.