Effect of C/C preform density on structure and property of 2D Cf/SiC composites
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摘要: 通过理论计算，探究Cf/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、1.12 g/cm3的C/C坯体，通过液相渗硅法反应合成2D Cf/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，Cf/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0.98 g/cm3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0.98 g/cm3时，2D Cf/SiC复合材料结构和性能较优。Abstract: Relationship of densities between Cf/SiC composites and C/C preforms was studied by theoretical calculation. And 2D Cf/SiC composites were prepared from three kinds of C/C preforms with densities of 0.98, 1.06, 1.12 g/cm3, which were prepared by repeatedly overlapping the layers of carbon cloths and precursor infiltration pyrolysis, by liquid silicon infiltration. The effects of densities of C/C preforms on structure and property of composites were study. The results were compared with theoretical calculation results. The research results show that the test results are basically consistent with the theoretical mathematical results. The density of Cf/SiC composites increases first and then decreases with the increase of the C/C preforms density. And when the density of C/C preform is greater than 0.98 g/cm3, the flexural strength of composites decreases with the increase of C/C preforms density. The composites have a better structure and property, while the density of C/C preforms is 0.98 g/cm3.
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Keywords:
- 2D Cf/SiC composites /
- C/C preforms /
- density /
- liquid silicon infiltration /
- structure /
- property
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