裂解温度对先驱体转化制备2D-C_f/SiC材料结构与性能的影响

Effect of Pyrolysis Temperature on Structure and Properties of 2D-C_f/SiC Composites Fabricated by Precursor Pyrolysis

以聚碳硅烷(PCS)、二乙烯基苯(DVB)和S iC微粉为原料制备了2D-Cf/S iC材料,考察了首次裂解温度对材料结构与性能的影响。结果表明,首次裂解温度的提高有助于弱化界面结合,形成良好的界面结构,从而提高材料的力学性能。当裂解温度从1000℃提高到1600℃时,材料的弯曲强度由200.7MPa提高到319.2MPa,剪切强度由16.8MPa提高到29.8MPa,断裂韧度由7.4 MPa.m1/2提高到15.0 MPa.m1/2。

Two-dimensional carbon fiber cloth reinforced silicon carbide （2D-Cf/SiC） composites were fabricated with polycarbosilane （PCS） and divinylbenzene （DVB） as precursors and SiC as inert fillers. The effects of the pyrolysis temperature in the first cycle on the microstructure and mechanical properties of Cf/SiC composites were investigated. The results showed that increasing the first pyrolysis temperature could decrease the interracial bonding force between carbon fiber and SiC matrix. As a result, the composites fabricated with higher pyrolysis temperature exhabit better mechanical properties. When the pyrolysis temperature of the first cycle raised from 1000℃ to 1600℃ , the flexural strength, shear strength and fracture toughness enhanced from 200.7MPa, 16.8MPa and 7.4 MPa · m^1/2 to 200.7MPa, 16.8MPa and 7.4 MPa · m^1/2, respectively.