摘要
为了提高连续碳纤维增强碳化硅(SiC)复合材料的抗烧蚀性能,采用浆料浸渗结合化学气相浸渗SiC工艺制备出三维针刺碳纤维增强SiC-碳化钽(TaC)复合材料。采用氧-乙炔烧蚀试验测试复合材料烧蚀性能,用扫描电子显微镜分析烧蚀后材料表面的微观形貌,用X射线衍射、表面能谱分析对材料烧蚀后成分进行分析表征。结果表明:C/(SiC-TaC)复合材料线烧蚀率为0.07mm/s,相对C/SiC复合材料而言表现出较好的抗烧蚀能力,添加TaC有助于提高C/SiC复合材料抗烧蚀性能。在中心区域,出现明显烧蚀坑,纤维与基体被致密的Ta2O5层覆盖,起到保护C纤维和基体的作用,复合材料的烧蚀以升华、氧化和机械剥蚀为主。在边缘和过渡区域,烧蚀以热化学氧化烧蚀为主。
Three dimensional carbon fiber reinforced silicon carbide-tantalum carbide（3D C/（SiC-TaC）） composites were fabricated by slurry impregnation combined with chemical vapor infiltration SiC process.The ablation property was investigated by using oxyacetylene ablation equipment.The materials and microstructures of the ablated samples were characterized by X-ray diffraction,energy dispersive spectroscopy and scanning electron microscopy.The linear and mass ablative rates were 0.07 mm/s and 0.096 g/s,respectively.The results indicate that the addition of TaC to C/SiC improves the anti-ablation performance at ultra high temperature.Obvious ablation hole was found in the center region,compact Ta2O5 layer covered and protected the carbon fibers and matrix.Sub-limation,oxidation and mechanical denudation were the main ablation mechanisms in the center region of composites.Meanwhile,thermochemical oxidation controlled the ablation in the transition and outer regions.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第10期1718-1723,共6页
Journal of The Chinese Ceramic Society
关键词
三维针刺
碳纤维增强碳化硅-碳化钽
烧蚀性能
烧蚀机理
three dimensional needed
carbon fiber reinforced silicon carbide-tantalum carbide
ablation property
ablation mechanism
