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采用热梯度化学气相渗透工艺(TCVI)制备了11组不同表观密度的热解碳基C/C复合材料,从每组C/C复合材料上分别截取4个试样进行弯曲强度实验。采用偏光显微镜(PLM)分析了材料的孔隙结构,并利用计盒法求出了图像中孔隙的分形维数。在此基础上利用分形理论表征C/C复合材料的孔隙结构,建立了相同增强预制体及致密化方法制备的C/C复合材料的弯曲强度分形计算模型。计算结果与实验值吻合较好,表明本研究提出的模型具有可行性。
Eleven groups of pyrolytic carbon-based C / C composites with different apparent densities were prepared by thermal gradient chemical vapor infiltration process (TCVI). Four specimens were intercepted from each group of C / C composites for bending strength test. Polarization microscopy (PLM) was used to analyze the pore structure of the material, and the fractal dimension of the pores in the image was calculated by the box-counting method. On this basis, fractal theory was used to characterize the pore structure of C / C composites, and the fractal calculation model of C / C composites prepared by the same preform strengthening and densification was established. The calculated results are in good agreement with the experimental data, which shows that the proposed model is feasible.