对等温化学气相渗透法(ICVI)制备的C/SiC复合材料进行热处理,利用声发射(AE)技术对热处理前后C/SiC试样拉伸过程声发射累积能量进行分析,通过SEM进行微结构观察.结果表明:界面层较薄的C/SiC试样经1500℃热处理后拉伸强度与初始强度相近,经1700和1900℃热处理后拉伸强度显著提高,其断裂应变随着热处理温度升高而大幅提高,弹性模量却呈现下降趋势;界面层较厚的C/SiC试样经1500和1700℃热处理后拉伸强度变化不大,断裂应变显著提高,弹性模量逐渐降低,经1900℃热处理后拉伸强度和断裂应变开始下降,而弹性模量变化较小.热处理可以显著提高C/SiC的韧性,在拉伸过程中的断裂功和声发射累积能量均显著增加.界面层较薄的C/SiC断裂模式从脆性逐渐向韧性转变,而界面层较厚的C/SiC热处理后韧性进一步提高.
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