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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Ta2O5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。
The pyrocarbon (PyC) and TaC coatings were pre-deposited in a quasi-three-dimensional acupuncture carbon felt by a chemical vapor infiltration method, followed by subsequent densification of the preform using pyrolytic carbon and resin charcoal to prepare a pyrochlore containing PyC-TaC -PyC composite interface of C / C composites (TaC-C / C), and its oxyacetylene flame ablation. Compared with C / C, the 3 vol% TaC-C / C material shows no significant improvement in ablation resistance and can not withstand the prolonged oxidation of acetylene flame; while 14 vol% TaC-C / C material shows better Long-term ablation resistance. After the oxygene flame is ablated, the surface of the composite material is composed of C, TaC, (Ta, O) and Ta2O5 phases. The surface of 3 vol% TaC-C / C material mainly formed small and diffuse ablation spots (5-20 s) and ablation pits (120 s), while the surface of 14 vol% TaC-C / C material mainly formed ablation Spot (5 s), a more complete layer of tantalum oxide (20 s), and ablation pits (120 s). After 20% ablation for 14 vol% TaC-C / C material, the composites can be divided into surface oxide region, transition region and matrix region. The complete and continuous tantalum oxide layer on the composite surface can effectively protect the composites.