碳化硅纤维增强碳化硅复合材料(SiC/SiC)是极具前景的高温结构材料.通过先驱体浸渍裂解(PIP)工艺分别制各了Pyc界面和CNTs界面SiC/SiC复合材料,对两种SiC/SiC复合材料的整体力学性能以及界面剪切强度等进行了测试表征,并对材料中裂纹的产生与扩展进行了原位观测.结果表明,两种界面SiC/SiC复合材料弯曲强度相近,但PyC界面SiC/SiC复合材料的断裂韧性约为CNTs界面SiC/SiC复合材料的两倍.在PyC界面SiC/SiC复合材料中,裂纹沿纤维-基体界面扩展,PyC涂层能够偏转或阻止裂纹,材料呈现伪塑性断裂特征;而在CNTs界面SiC/SiC复合材料中,裂纹在扩展路径上遇到界面并不偏转,初始裂纹最终发展为主裂纹,材料呈现脆性断裂模式.
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