火箭推进2017，Vol.43Issue(3)：67-73,7.
改性先驱体制备C/SiC复合材料性能研究
Properties of C/SiC composites prepared by modified precursor
王芙愿 1王毅 1杨晓辉 1白龙腾1
作者信息
- 1. 西安航天动力研究所,陕西西安710100
- 折叠
摘要
Abstract
A crosslinking agent is used to modify the polycarbosilane (PCS) precursor. The modified precursor is used to fabricate C/SiC composites. Because of the relative high ceramic yield of the modified precursor, the densification time of C/SiC composite was reduced, while the porosity of samples was decreased by 7.2% and the density was increased by 2.01g/m3. With the improvement of the inner microstructure of C/SiC, the modified precursor can also improve the mechanical properties of C/SiC. The bending strength was increased by 459.4MPa and the fracture toughness was increased by 13.6 MPa·m1/2, which were increased by 51.9% and 32.0% respectively in comparison with samples fabricated by the single component PCS precursor. The performance test results of ablation show that the mass ablative rate and the linear ablative rate are 8.3×10-3mm/s and 4.3×10-3g/s respectively, which have been reduced 85.7% and 73.1% respectively in comparison with samples fabricated by the single component PCS precursor. The analysis results of the surface morphology and the inner microstructure of C/SiC indicate that the improvement of mechanical and ablation properties benefit by the dense matrix and the matrix protection for the fiber.关键词
C/SiC复合材料/改性先驱体/力学性能/烧蚀性能/显微结构Key words
C/SiC/modified precursor/mechanical property/ablative property/microstructure分类
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王芙愿,王毅,杨晓辉,白龙腾..改性先驱体制备C/SiC复合材料性能研究[J].火箭推进,2017,43(3):67-73,7.
