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Ablative Property of C/C–SiC–HfC Composites Prepared via Precursor Infiltration and Pyrolysis under 3,000 °C Oxyacetylene Torch

ISSN号：1006-7191
期刊名称：《金属学报：英文版》
时间：0
分类：TB33[一般工业技术—材料科学与工程] V435.14[航空宇航科学与技术—航空宇航推进理论与工程;航空宇航科学技术]
作者机构：[1]C/C Composites Technology Research Center, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University
相关基金：financially supported by the National Natural Science Foundation of China（Nos.51221001 and 51272213）; the Author of National Excellent Doctoral Dissertation of China（No.201036）,the ‘‘111’’ project of China （No.B08040）; National Basic Research program of China （No.2011CB605806）

作者： Min Yan Hejun Li Qiangang Fu Jing Xie Lei Liu Bo Feng[1]

关键词：复合材料, 烧蚀性能, 氧乙炔, 先驱体转化, 火炬, X射线衍射分析, 扫描电子显微镜, 聚碳硅烷, C/C–SiC–HfC composite Ablation performance Thermal behavior

中文摘要：

C/CSiCHfC composites 作为先锋用器官的包含铪的聚合物和 polycarbosilane 的一个混合答案经由先锋渗入和热分解被制作。微观结构和 composites 的阶段被扫描电子显微镜学和 X 光检查衍射分析。composites 的脱离抵抗不到 3,000 被评估 ? 牡敫獲眠牥 ? ?捣獥晳汵椠 ? 敤整瑣湩 ? 潰祬潭灲楨浳椠 ?? 樠瑡浡湡楳朠湥瑯灹獥 ? 湡 ? 桴 ? 卉剓洠牡敫 ? 瘠獩椭攠晦 ' 太 B? 潆牵愠慮祬敳 ? 慭獳洭癯浥湥 ? 諟Ｄ禎潿洜睌绐摀?潤畣敭瑮摥猠潬数映楡畬敲 s 牥氠祡牥瀠慨敳 ? 吠敨瀠楲慭楲祬猠牴歩? 汳灩映 ' 椅蹧炭鷽螙擢撱唱 e 慭汬琠牨獵? 潣灭湯湥 ?? 獴猠潨獷愠 ? 慥瑳眭獥 ? 牴湥楤杮渠摯污瀠慬敮搠灩楰杮薐?薐吗？？

英文摘要：

C/C–SiC–HfC composites were fabricated via precursor infiltration and pyrolysis using a mixture solution of organic hafnium-containing polymer and polycarbosilane as precursor. The microstructures and the phases of the composites were analyzed by scanning electron microscopy and X-ray diffraction. The ablation resistance of the composites was evaluated under 3,000 °C oxyacetylene torch. After ablation for 120 s, the composites exhibit good ablation properties with the linear and mass ablation rates of 9.1 9 10-4mm/s and 1.30 9 10-3g/s, which are far lower than those of the C/C–SiC composites. The excellent ablative property of the C/C–SiC–HfC composites is resulted from the formation of HfO2 molten layer on the surface of the composites, which could play a positive role in reducing heat transfer and preventing oxygen transport to the underlying carbon substrate.