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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(1 600~1 800℃)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(2 100~2 300℃)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。
The thin-walled C / C-SiC composites were prepared by the combination of chemical vapor infiltration method and precursor impregnation cracking (CVI + PIP) process. The effects of heat treatment on C / C-SiC Component density, deformation and mechanical properties. The results show that intermediate heat treatment can improve the open porosity of C / C, facilitate the infiltration of SiC, and produce higher density C / C-SiC composites. The intermediate heat treatment has little effect on the interlaminar shear properties , But the in-plane tensile strength and overall pressure-bearing performance of the component are affected. The intermediate heat treatment will result in the deformation of the thin-walled C / C-SiC component in the inner and outer diameters and the height direction; suitable heat treatment temperature / C-SiC component interface has a moderate bonding strength, in-plane tensile strength and overall pressure-bearing properties have been greatly improved; and higher heat treatment temperature (2 100 ~ 2 300 ℃) to reduce the strength of carbon fiber, Strength and overall pressure performance dropped significantly.