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中间热处理对薄壁C/CSiC构件制备及力学性能的影响

, PP. 759-764

Keywords: 热处理,C/C-SiC构件,温度,制备,力学性能

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Abstract:

采用“化学气相渗透法+先驱体浸渍裂解法”(CVI+PIP)混合工艺制备了薄壁C/C-SiC复合材料构件,研究了C/C多孔体的热处理对C/C-SiC构件密度、变形量及力学性能的影响。研究结果表明:中间热处理可提高C/C的开孔率,有利于SiC的渗入,制备出密度较高的C/C-SiC复合材料构件;中间热处理对构件的层间剪切性能影响不大,但影响构件面内拉伸强度和整体承压性能;中间热处理会导致薄壁C/C-SiC构件在内外径和高度方向发生变形;合适的热处理温度(1600~1800℃)使C/C-SiC构件界面结合强度适中,面内拉伸强度及整体承压性能有了极大的提高;而较高的热处理温度(2100~2300℃)使碳纤维强度下降,使构件拉伸强度及整体承压性能大幅下降。

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