自愈合碳化硅陶瓷基复合材料研究及应用进展

为了满足高推重比航空发动机长时热力氧化环境的使用需求,连续纤维增韧碳化硅陶瓷基复合材料正朝自愈合方向发展.本文介绍自愈合碳化硅陶瓷基复合材料的微结构与性能,自愈合与强韧化机理,制造方法和工艺特点及其在航空发动机热端部件的应用情况,表明多元多层微结构形成了"层层设防,就地消灭"的氧化防御体系,是复合材料实现自愈合与强韧化的关键.自愈合碳化硅陶瓷基复合材料能够满足发动机高温服役环境要求,显著降低发动机的结构重量,从而有效提高发动机的推重比.

Progress on Self-Healing Silicon Carbide Ceramic Matrix Composites and Its Applications

Continuous fiber reinforced silicon carbide ceramic matrix composites were developing towards possessing self-healing properties for the need of high thrust mass ratio aerospace-engine working in thermal oxidizing environment.The microstructure and properties of a self-healing silicon carbide matrix composite were introduced.The mechanism of toughness and stiffness of the composite and the self-healing behaviors were commented.The application progress of self-healing silicon carbide component was summarized.Manufacturing method and technique feature were reviewed.Multi-component and multi-layer microstructure was the key point for this composite possessing self-healing and toughing properties,and oxidation resistant system which exhausted O_2 and sealed crack in each layer.This self-healing silicon carbide matrix composite coule not only meet the requirements of for aerospace-engine service but decreased weight remarkably,increased thrust-weight ratio in return.