采用不同界面强度的2种2D～C/SiC试件,在空气环境中进行700℃无应力氧化试验.通过扫描电镜(SEM)分析发现:材料表面的氧化机制为反应控制,纤维均匀变细;内部的氧化机制为扩散控制,被氧化的纤维产生了缺口或者局部缩颈现象.纤维氧化使有效承载面积减小,导致材料的模量和强度下降.强界面材料模量高而强度低,断口整齐;弱界面材料模量低而强度高,纤维拔出较长.基于以上SEM分析结果,建立了细观力学模型,对起始模量进行模拟计算,获得了与试验值比较吻合的结果.
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