HfC nanowires to improve the toughness and oxidation resistance of Si-Mo-Cr/SiC coating for C/C composites

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• 作者：Jincui Ren ; Yulei Zhang ; ^{zhangyulei@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Heng Hu ; Pengfei Zhang ; Tian Fei ; Leilei Zhang
• 关键词：Coating ; Hfc nanowires ; Cabon/carbon composites ; Oxidation resistance
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：42
• 期：13
• 页码：14518-14525
• 全文大小：4132 K

文摘

To improve the oxidation resistance of carbon/carbon (C/C) composites, a dense HfC nanowire-toughened Si-Mo-Cr/SiC multilayer coating was prepared by chemical vapor deposition (CVD) and pack cementation. The microstructure, thermal shock and isothermal oxidation resistance of the coating were investigated. HfC nanowires could improve the toughness of the coating and suppress the coating cracking. After incorporating HfC nanowires in the coating, both of the thermal shock and isothermal oxidation resistance of the coating were obviously improved. The multilayer coating with HfC nanowires could effectively protect C/C composites at 1773 K for 270 h, whose weight loss is only 0.19%. The good oxidation resistance is mainly attributed to the formation of a compound glass layer containing SiO₂ and Cr₂O₃.