反应熔渗工艺制备的C/C-SiC复合材料烧蚀性能及构件研制

Component development and ablation properties of C/C-SiC composites prepared with RMI process

采用反应熔渗工艺(RMI)快速制备了不同碳化硅含量的C/C-SiC复合材料,通过氧-乙炔烧蚀试验,测试了材料的烧蚀性能。利用SEM/EDS表征了复合材料烧蚀后的表面形貌和成分,分析了碳化硅含量对复合材料烧蚀性能的影响。结果表明,随着基体中碳化硅含量的提高,烧蚀过程中生成的二氧化硅保护膜更加致密,导致C/C-SiC复合材料的烧蚀率逐渐降低。在此基础上,利用优化工艺制备了密度均匀的大尺寸C/C-SiC构件,经过地面热试车考核,构件接近零烧蚀,满足发动机热试车的应用。

Carbon fiber reinforced carbon and silicon carbide matrix(C/C-SiC)composites with different SiC contents were prepared by reaction melt infiltration(RMI)process.The ablative properties of the composites were tested by oxyacetylene ablation technique.The microstructure and ablative behavior of the C/C-SiC composites have been investigated.With the increase of the SiC content in the C/C-SiC composites,the SiO 2 produced during the ablative process becomes dense,and then the ablative ratio of the composites decreases.On the basis of this fact,large size C/C-SiC components with uniform density were prepared by a optimizated process.After the ground thermal testing,the components were closed to zero ablation and met the application of the motor thermal testing.