C/C ZrC复合材料高温氧乙炔焰烧蚀性能及机理研究-中国材料进展

文章信息/Info

Title:: Ablation Behavior and Mechanism of C/C ZrC Composites under Oxyacetylene Torch Flame

Author(s):: YANG Xin; SU Zhean; HUANG Qizhong; CHENG Jianxun; (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)

摘要:: 采用基体改性技术将ZrC引入C/C复合材料中，制备了一种新型的C/CZrC复合材料。通过氧乙炔焰烧蚀实验，研究了ZrC含量及烧蚀时间对C/CZrC复合材料高温耐烧蚀性能的影响。用XRD和TEM对烧蚀后材料的相组成和微观结构进行了分析，结果表明，ZrC被氧化的主要生成物为ZrO2，伴有少量ZrC和C，含2646%ZrC的C/CZrC复合材料，在氧乙炔焰烧蚀50 s后，在材料表面生成致密的ZrO2膜，阻挡了氧对基体的扩散，并有隔热作用，有效保护复合材料被烧蚀和冲刷。实验表明，复合材料在高温氧乙炔焰烧蚀20 s后，线烧蚀率和质量饶蚀率分别为0012 mm/s和0003 3 g/s，比C/C复合材料分别降低76%和50%。

Abstract:: To improve the ablation resistance of C/C composites in severe environment, C/CZrC composites were fabricated by innermodification method via introducing ZrC into C/C composites. The effect of ZrC content and ablation time on ablation property of C/CZrC composites was investigated by oxyacetylene torch flame test, and the structure of C/CZrC composites after ablation was studied by XRD and SEM analysis. The results show that the introduction of ZrC into C/C composites can effectively reduce the linear ablation rate and mass ablation rate of C/C composites, and relative high ZrC content is favorable for improving the ablation resistance of C/C composites. As ablation time increased, the linear ablation rate and mass ablation rate are further reduced. The improvement of ablation resistance is mainly attributed to the formation of ZrO2 films in the ablation process.