含PyC-TaC-PyC复合界面C/C材料的氧乙炔焰烧蚀行为

复合材料学报, 2009, 26(3): 155-161.

含PyC-TaC-PyC复合界面C/C材料的氧乙炔焰烧蚀行为

陈招科 ^1, , 熊翔 ^2, , 黄伯云 ^3, , 李国栋 ^4, , 肖鹏 ^5, , 张红波 ^6, , 王雅雷 ^7,

1.中南大学,粉末冶金国家重点实验室,长沙,410083

2.中南大学,粉末冶金国家重点实验室,长沙,410083

3.中南大学,粉末冶金国家重点实验室,长沙,410083

4.中南大学,粉末冶金国家重点实验室,长沙,410083

5.中南大学,粉末冶金国家重点实验室,长沙,410083

6.中南大学,粉末冶金国家重点实验室,长沙,410083

7.中南大学,粉末冶金国家重点实验室,长沙,410083

基金项目: 国家高技术研究发展计划(863计划)(2007AA032100) 国家自然科学基金(50872154;50721003)

关键词： C/C复合材料 , 化学气相渗透 , 层状结构 , 微观结构 , 烧蚀性能

Ablation behaviors of C/C composites with pyrocarbon (PyC)-TaC-PyC multi-interlayers in oxyacetylene flame

用化学气相渗透方法,在准三维针刺炭毡中预沉积热解炭(PyC)和TaC涂层,再利用热解炭和树脂炭对该预制体进行后续致密化,制得含pyC-TaC-PyC复合界面的C/C复合材料(TaC-C/C),并对其进行氧乙炔焰烧蚀.与C/C相比,3 vol% TaC-C/C材料耐烧蚀性能无明显提高,且无法承受长时间的氧炔焰烧蚀;而14 vol% TaC-C/C材料表现出较好的长时间耐烧蚀性能.氧炔焰烧蚀后,复合材料表面由C、TaC、(Ta,O)及Ta2Os相组成.3 vol% TaC-C/C材料表面主要形成细小弥散的烧蚀斑点(5～20 s)和烧蚀凹坑(120 s);而14 vol%TaC-C/C材料表面则主要形成烧蚀斑点(5 s)、较完整的氧化钽层(20 s)以及烧蚀凹坑(120 s).14 vol%TaC-C/C材料在烧蚀20 s后,复合材料可分为表面氧化物区、过渡区和基体区;复合材料表面完整连续的氧化钽层能有效保护复合材料.

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