Effect of ZrC-SiC content on microstructure and ablation properties of C/C composites

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• 作者：Jun LI ; Xin YANG ; Zhe-an SU ; Liang XUE ; Ping ZHONG ; Shuai-peng LI ; Qi-zhong HUANG ; ^{qzhuang@csu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hong-wei LIU
• 关键词：C/C composites ; ZrC ; SiC ; ablation ; precursor infiltration and pyrolysis
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：26
• 期：10
• 页码：2653-2664
• 全文大小：6541 K

文摘

C/C–ZrC–SiC composites with different ZrC–SiC contents were fabricated by precursor infiltration and pyrolysis. The effect of ceramic content on the microstructure and ablation resistance was investigated. Both the C/C–SiC and C/C–ZrC–SiC composites exhibited good ablation resistance under the plasma flame above 2300 °C. With the increase of ZrC content, a continuous oxide layer and a solid Zr–Si–O mesophase were formed during the ablation. And the structure of the formed oxides layer closely linked with the contents of ZrC–SiC ceramics. The solid ZrO₂–ZrC and Zr–Si–O mesophase could increase the viscosity of SiO₂ moderately and improve the anti-scouring ability. The continuous SiO₂–ZrO₂–ZrC–SiC layer would serve as a thermal and oxygen barrier for preventing the substrate from further ablation. The C/C–ZrC–SiC composites with 27.2% ZrC and 7.56% SiC shows superior ablation resistance, and the mass and linear ablation rates are −3.51 mg/s and −1.88 μm/s, respectively.