裂解升温速率对C/C-SiC复合材料性能的影响研究

FABRICATION OF C/C-SiC COMPOSITES BY DIFFERENT PYROLYSIS HEATING RATES

以聚碳硅烷(PCS)为先驱体,采用先驱体浸渍裂解(PIP)工艺制备了C/C-SiC复合材料,研究了先驱体转化过程中不同裂解升温速率对材料力学和抗氧化性能的影响。结果表明:以较低的裂解升温速率制备的C/C-SiC复合材料的力学和抗氧化性能较好。采用20℃/h裂解升温速率制得的C/C-SiC复合材料的弯曲强度达278 MPa,在1400℃氧化2 h后,失重率为3.1%。

C/C- SiC composites were fabricated with infiltration and pyrolysis of polycarbosilane （PCS） using a precursor infiltration pyrolysis （PIP） process. The effects of pyrolysis heating rates on the mechanical properties and oxidation resistance of C/C-SiC composites were investigated. The results show that the C/C- SiC composites which were fabricated by lowest heating rate have best mechanical properties and oxidation resistance. The flexural strength of the composites, which were pyrolysised by 20 ℃/h pyrolysis heating rate, was 278 MPa, and the mass loss ratio is 3.1% after being oxidated at 1 400 ℃ for 2 h.