摘要
结合化学气相渗透(CVI)和聚合物先驱体浸渍裂解(PIP)工艺制备出炭纤维增强碳基(C/C)、炭纤维增强碳-碳化硅基(C/C-Si C)和炭纤维增强碳-硅-锆-氧(C/C-Si-Zr-O)复合材料,并对其微观形貌、物相结构、力学性能和导热性能进行测试和表征。结果表明,C/C-Si-Zr-O复合材料在外部载荷作用下,纤维脱黏和纤维拔出等应力释放效应显著,弯曲强度优于C/C和C/C-Si C复合材料;此外,C/C复合材料基体热解炭的导热系数较高,复合材料孔隙率小,结构缺陷较少,声子的平均自由程较长,因此具有较高的导热系数(水平方向69.09 W/(m·K),垂直方向25.28 W/(m·K))。
Carbon fiber-reinforced carbon composites （C/C）, carbon fiber reinforced-carbon and silicon carbide binary matrix composites （C/C-SiC） and carbon fiber reinforced carbon-silicon-zirconium-oxygen matrix composites （C/C-Si-Zr-O） were pre- pared through a combination of chemical vapor infiltration （CVI） and polymer impregnation pyrolysis. The microscopic morpholo- gy, phase structure, mechanical properties and thermal conductivity of the C/C, C/C-SiC and C/C-Si-Zr-O composites were inves- tigated by SEM, XRD, EDA and laser flash thermal conductive measurements. Results showed that the flexural strength of the C/ C-Si-Zr-O composites was higher than that of the C/C and the C/C-SiC composites, which can be ascribed to their energy absorp- tion mechanisms, such as fiber debonding and pull-out from the matrix. The C/C composites possessed the highest thermal conduc- tivity （69.09 W/（ m·K） in the parallel direction and 25.28 W/（ m·K） in the vertical direction）, which can be accounted for by the high thermal conductivity of the pyrocarbon matrix, a low porosity of the composites, a long phonon mean free path and fewer structural defects.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2014年第6期467-472,共6页
New Carbon Materials
关键词
复合材料
导热系数
应力释放
Ceramic matrix composites
Thermal conductivity
Energy absorption mechanisms
