A novel design of Al-Cr alloy surface sealing for ablation resistant C/C-ZrC-SiC composite

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• 作者：Yabin Chang ; Wei Sun ; ^{sunweimse@csu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiang Xiong ; ^{xiong228@sina.comX.xiong" class="auth_mail" title="E-mail the corresponding author} ; Zhaoke Chen ; Yalei Wang ; Zhenhua Hao ; Yonglong Xu
• 关键词：C/C composite ; Ultra-high temperature ceramics ; Surface sealing ; Al-Cr alloy ; Ablation
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：859-864
• 全文大小：2475 K

文摘

To improve anti-ablation property of C/C-ZrC-SiC composite, a novel design of Al-Cr alloy surface sealing was performed by liquid melt impregnation. Results show that Al₈Cr₅ formed on the surface which could effectively seal the holes and cracks. The cooperation of metal and ceramics contribute a better anti-ablation performance to the obtained composite, and its mass and linear ablation rates decrease by 98.3% and 81.2% respectively. This special surface structure evolves into a highly dense oxide scale comprising various solid solutions (including Al-Cr-O, Al-Si-O, Cr-Si-O) and ZrO₂, which could significantly improve the anti-ablation performance of C/C-ZrC-SiC composite.