SiC/HfC/SiC ablation resistant coating for carbon/carbon composites

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• 作者：Yongjie Wang ; Hejun Li ; ^{lihejun@nwpu.edu.cn} ; Qiangang Fu ; Heng Wu ; Dongjia Yao ; Hailiang Li
• 关键词：Carbon/carbon composites ; Ablation resistance ; HfC ; HfSiO4 ; Oxidation
• 刊名：Surface and Coatings Technology
• 出版年：2012
• 期刊代码：106_02578972
• 类别：ms
• 出版时间：25 May, 2012
• 卷：206
• 期：19-20
• 页码：3883-3887
• 文件大小：1591 K

摘要

To improve the ablative resistance of carbon/carbon (C/C) composites, a SiC/HfC/SiC coating was prepared by a multi-step technique of diffusing reaction and chemical vapor deposition. The microstructure and morphology of the coatings were characterized by Scanning Electron Microscopy, X-ray diffraction. The coated C/C exhibits good ablation resistance. A compact glassy HfO₂ layer was obtained on the coating surface after ablation, which can efficiently prevent C/C composites from ablation. Meanwhile, the outer SiC coating provides positive protection; Weight loss of the coated samples is only 2.3%after oxidation at 1500 掳C for 66 h. HfSiO₄ was formed during oxidation and characterized by a stable glassy phase which could protect C/C composites from oxidation.