界面对浆料浸渍裂解C_f/SiC复合材料性能的影响

Effects of Interphase on Properties of C_f/SiC Composites by Slurry Impregnation and Pyrolysis

利用强制脉冲CVI工艺在2.5D纤维编织体上沉积C-SiC双层界面,然后通过浆料浸渍裂解方法得到了Cf/SiC复合材料,并考察界面中C层、SiC层厚度变化对Cf/SiC复合材料性能的影响。界面中C层、SiC层厚度变化对浸渍过程影响不大,得到的Cf/SiC复合材料密度基本相当,约2.0g/cm3。但随C层厚度的增加,强度减小;随着SiC层厚度的增加,强度增加,到达一定厚度后,其强度几乎不变,为290.0MPa。在C层厚度为50nm,SiC层厚度为600nm时,表现出强的非脆性断裂。

Cf/SiC composites were fabricated by slurry impregnation and pyrolysis method after C-SiC bi-layer was deposited by Forced Pressure-Pulsed CVI on 2.5D fiber performs. The effects of C and SiC layer thickness on the properties of the composites were investigated. Results indicated that although the interphase layer thickness was different, densities were almost at the same level, about 2.0 g/cm^3. As the thickness of the C layer increased, the flexural strength of the composites decreased. However, the flexural strength increased to about 290 MPa and kept the numerical when the SiC layer thickness increased. Meanwhile, the composites showed evident non-brittle fracture behavior.