裂解温度对PIP制备2D C_f/Si-O-C复合材料结构与性能的影响

Effect of Pyrolysis Temperature on the Structure and Properties of 2D C_f/Si-O-C Composites Fabricated by Precursor Pyrolysis

以二维碳纤维布、硅树脂先驱体、SiC微粉和乙醇溶剂为原料,采用先驱体转化工艺制备了2D Cf/Si-O-C复合材料,考察了裂解温度对材料结构和性能的影响。结果表明,首周期裂解温度对制备材料的力学性能有重要影响,纤维-基体间的界面弱化是复合材料力学性能提高的主要原因;第6周期采用合适的温度裂解可提高复合材料的力学性能,其弯曲强度和断裂韧性分别达到了263.9MPa和12.8MPa.m1/2。

Two-dimensional carbon fiber cloth reinforced silicon oxcarbide（2D Cf/Si-O-C） composites were fabricated with Silicone Resin （SR） as precursors,ethanol as solvent and SiC powder as inert fillers by precursor infiltration and pyrolysis.The effects of the pyrolysis temperature on the microstructure and mechanical properties of 2D Cf/Si-O-C composites were investigated.The results show that the temperature of first cycle has great effect on the mechanical properties of 2D Cf/Si-O-C.The better mechanical properties are attributed to weakening of the fiber/matrix interfacial bonding.When the sixth pyrolysis is carried out at appropriate temperature,the mechanical properties of 2D Cf/Si-O-C composites are enhanced greatly.The flexural strength and fracture toughness of the composites are 263.9MPa and 12.8 MPa·m^1/2,respectively.