C/C复合材料Ta2O5TaC/SiC抗氧化抗烧蚀涂层研究-中国材料进展

文章信息/Info

Title:: Ta2O5TaC/SiC Multilayer Coating for Protecting C/C Composites against Oxidation and Ablation

Author(s):: YAO Dongjia; LI Hejun; FU Qiangang; TAO Jun; WANG Yongjie; (Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xian 710072,China)

摘要:: 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Ta 2O 5 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1 500 ℃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Ta 2O 5 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；Ta 2O 5 TaC/SiC复合涂层在1 500 ℃静态空气环境下可对C/C复合材料有效保护100 h以上；涂层试样在氧乙炔烧蚀环境中烧蚀60 s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%。

Abstract:: To improve the property of anti oxidation and anti ablation of carbon/carbon (C/C) composites at high temperature, Ta 2O 5 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 Ta2O 5 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 Ta2O5TaC/SiC multilayer coating could effectively improve the anti ablation property of C/C composites.