影响碳化硅基复合材料机械性能的工艺因素

介绍了纤维及预制体成型、高温处理、界面技术、基体致密化及后处理等工艺因素对碳化硅基复合材料机械性能的影响。基体密化工艺是影响复膈材料性能最为主要的因素，化学气相渗透工艺制备的碳化硅基复合材料的强度和韧性明显高于其它工艺制备的复合材料，预制体高温处理可提高纤维在基体复合材料及使用过程中的高温稳定性，减少纤维／基体界面的热应力，但高温处理会引起纤维强度大幅度下降，在高温处理前先进行中间相涂层处理，不仅

Processing Influence on Mechanical Properties of Silicon Carbide Matrix Composites

The processing influence on the mechanical properties of silicon carbide matrix composites is reviewed,which includes fibers and preform formation, high temperature treatment,interface technology,matrix densification and post treatment. Matrix densification strongly influences the mechanical properties of the composites,and the chemical vapor infiltration process offers higher strength and toughness to the composites than other matrix densification processes.High temperature treatment can improve thermal stability of the fibers at elevated service temperature and decrease thermal stress at fiber/matrix interface. However,high temperature treatment also causes severe loss of the fiber strength. Interface coating before preform high temperature treatment can enhance the thermal stability of the fibers and the toughness of the composites and give little fiber strength loss. The surface treatment of the fibers can improve the bonding strength of fiber/marix interface and increase the number of the microcracks in the matrix, which enhances the strength and toughness of the composites.