三维针刺C/SiC在等离子焰中的烧蚀行为  

Plasma Arc Ablation Behavior of 3D Needled C/SiC Composites

作　　者：聂景江[1] 徐永东[1] 张立同[1] 成来飞[1] 马军强[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072

出　　处：《宇航材料工艺》2009年第1期53-57,共5页Aerospace Materials & Technology

基　　金：国家自然科学基金重大研究计划重点项目(9040501);国家杰出青年科学基金(50425208)

摘　　要：采用CVI制备了三维针刺C/SiC复合材料,利用等离子烧蚀对复合材料的烧蚀性能进行了分析。结果表明:复合材料的线烧蚀率和质量烧蚀率分别为131.3μm/s和74.2g/s,对应的标准偏差分别为4.9μm/s和4.7mg/s。微结构观察显示烧蚀表面不同区域其烧蚀机理不同,烧蚀中心以升华烧蚀为主,过渡区主要是升华烧蚀和等离子流的剪切剥蚀为主,而烧蚀边缘则以热氧化为主。3D needled C/SiC composites were prepared by chemical vapor infiltration process. And the ablation behavior of the composites was investigated by plasma arc. Results showed that the linear ablation rate and mass ablation rate were 131.3 μm/s and 74.2 mg/s,with standard deviations of 4.9 μm/s and 4.7 mg/s respectively. Microstructural observations revealed that the ablation processes were varied at different position. At the ablation center,the ablation of the composites was dominated by sublimation. Between the ablation center and the edge, the ablation of the composites was the coupled result of sublimation and shearing peel-off by plasma flow. At the edge, the ablation of the composites was dominated by thermo-oxidation.

关 键 词：三维针刺 C/SIC 等离子烧蚀 

分 类 号：V435.14[航空宇航科学与技术—航空宇航推进理论与工程] TB332[一般工业技术—材料科学与工程]