采用包埋法和低压化学气相沉积（CVD）法在碳／碳（C／C）复合材料表面依次制备了Ta2O5-TaC内涂层和SiC外涂层，用X射线衍射分析（XRD）、扫描电镜（SEM）及电子能谱（EDS）对涂层的相组成、微观形貌和元素组成进行了分析，研究了涂覆涂层后C／C复合材料在1500℃静态空气中的防氧化性能及在氧-乙炔烧蚀中的抗烧蚀性能。结果表明：采用两步法制得的Ta2O5-TaC／SiC复合涂层结构致密，该复合涂层有效提高了C／C复合材料的抗氧化和抗烧蚀性能；Ta2O5-TaC／SiC复合涂层在1500℃静态空气环境下可对C／C复合材料有效保护100h以上；涂层试样在氧乙炔烧蚀环境中烧蚀60S表明涂层可将C／C复合材料的线烧蚀率降低47．07％。质量烧蚀率降低29．20％。
To improve the property of anti-oxidation and anti-ablation of carbon/carbon （C/C） composites at high tem-perature, Ta2O5-TaC inner layer and SiC outer layer were prepared on the surface of C/C composites by pack cementation and chemical vapor deposition, respectively. Micro-structure of as-prepared coating was analyzed by XRD and SEM. The coated specimens were tested in static air atmosphere at 1 500 ℃ and oxyacetylene ablation to research their properties of anti-oxidation and anti-ablation. The results show that T2O5-TaC/SiC multilayer coating could prevent C/C matrix from oxidation in static air atmosphere at 1 500 ℃ over 100h. The linear and mass ablative rates of coated specimens could be reduced by 47.07% and 29.20% respectively after an oxyacetylene ablation test for 60 s, indicating that Ta2O5-TaC/SiC multilayer coating could effectively improve the anti-ablation property of C/C composites.
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