自加热化学气相法制备连续碳纤维增强碳化硅复合材料

Fabrication of Continuous Carbon Fiber Reinforced SiC Ceramic Composites by Self-heating Chemical Vapor Infiltration

通过自加热化学气相渗积法制备了 Cf/ Si C复合材料 ,对其力学性能进行了测试与分析 ,运用 SEM对复合材料显微结构和断口形貌进行了分析。研究表明 :自加热化学气相渗积法具有较快的渗积速率 ;气体流量的适度增加可改善复合材料的性能 ;碳涂层的厚度对复合材料的力学性能有较大的影响 ,适合的涂层厚度在 0 .35～ 0 .5

C f/SiC composites were fabricated by Self heating Chemical Vapor Infiltration (SHCVI) , Mechanical properties of the composites were investigated, Microstructure and fracture morphologies were observed under SEM It showed that: SHCVI can have faster infiltration rate than other CVI methods Increase of gas flow rate will improve the composites, properties The thickness of carbon coating has great influence on their mechanical properties , the appropriate value of which is within 0 35～0 55μm