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通过理论计算,探究C_f/SiC复合材料密度与C/C坯体密度的相关性;而后采用碳纤维布叠层制作2D C/C坯体,经先驱体浸渍裂解工艺增密,制得密度分别为0.98、1.06、1.12g/cm~3的C/C坯体,通过液相渗硅法反应合成2DC_f/SiC复合材料,探究C/C坯体密度对其结构和性能的影响。与理论计算结果来对比。研究结果表明:试验结果与理论数学计算结果基本一致。随着C/C坯体密度的增加,C_f/SiC复合材料的密度出现先上升后下降的趋势,当C/C坯体密度大于0.98g/cm~3后,复合材料的弯曲强度随着C/C坯体密度的增加而降低,C/C坯体密度为0.98g/cm~3时,2DC_f/SiC复合材料结构和性能较优。
The relationship between the density of C_f / SiC composites and the density of C / C composites was explored by theoretical calculation. Then, the 2D C / C blank was produced by laminating carbon fiber cloth and densified by precursor impregnation and pyrolysis process to obtain the density of 0.98, 1.06 and 1.12 g / cm ~ 3 respectively, and the 2DC_f / SiC composites were synthesized by liquid-phase silicon infiltration method. The effects of C / C density on the structure and properties were investigated. Contrast with theoretical calculation results. The results show that: the experimental results and the theoretical mathematical results are basically the same. With the increase of C / C billet density, the density of C_f / SiC composites first increases and then decreases. When the density of C / C billet is more than 0.98 g / cm ~ 3, the flexural strength of C_f / / C billet density decreases, the C / C green body density of 0.98g / cm ~ 3, 2DC_f / SiC composite structure and performance is better.