中文摘要：

采用CVI方法制备出了以Si-C-N陶瓷为基体、以热解碳为界面的碳纤维增强陶瓷基复合材料（C/PyC/Si-C-N）。用扫描电子显微镜（SEM）分析了C/PyC/Si-C-N的断口形貌,用三点弯曲法测试了C/PyC/Si-C-N的弯曲行为。研究结果表明：在1600℃以下,C/PyC/Si-C-N的弯曲强度随温度的升高而增加,弹性模量基本保持不变并略有增加;随温度的升高,PyC界面层较厚的区域其界面结合会逐渐变强,而界面层厚度非常小或无界面层的区域其界面结合会逐渐变弱。

英文摘要：

Carbon fiber reinforced Si-C-N matrix composite with a pyrolytic carbon（PyC）interlayer（C/PyC/Si-C-N）was fabricated by chemical vapor infiltration processing.The flexural behaviors of the composite was investigated by three-point-bending test.The fracture morphology was analyzed through a scanning electron microscopy（SEM）.The results indicated that the flexural strength of C/PyC/Si-C-N increased while the temperature was below1600 ℃.The Young′s modulus substantially unchanged and appeared slight increase in the test temperature range.As the temperature increased,the interfacial bonding in the area with thicker PyC interlayer became strong,while that in the area with thin interlayer or without interlayer became weak.