C/C预制体密度对C/C-SiC复合材料致密性及弯曲性能的影响  

Effects of C/C preforms density on the densification behavior and flexural property of C/C-SiC composites

作　　者：安娜[1] 李崇俊[1] 嵇阿琳[1] 

机构地区：[1]西安航天复合材料研究所,陕西西安710025

出　　处：《炭素技术》2015年第3期27-30,58,共5页Carbon Techniques

基　　金：国防基础科研计划(C0320110006)

摘　　要：以纳米SiC粉为惰性填料,采用先驱体浸渍裂解法制备C/C-SiC复合材料,研究了C/C预制体密度对复合材料致密性和弯曲性能的影响。结果表明,纳米SiC粉的添加能有效抑制先驱体裂解过程中的体积收缩,提高致密度。C/C预制体密度对制得的复合材料性能有很大的影响,其中用密度为1.24 g/cm3的C/C预制体制得的复合材料试样性能最优,其最终密度为1.80g/cm3,开孔率为7.32%,弯曲强度达220 MPa。The C/C-SiC composites were fabricated via precursor infiltration pyrolysis（PIP） process with nano-SiC powder as filler.Porous C/C composites with densities of 1.06, 1.24 and 1.43 g/cm3 were used as preforms, respectively, and the effects of porous C/C density on the densification behavior and flexural properties of C/C-SiC composites were investigated. The results show that the introduction of nano-SiC can restrain the shrinkage upon the pyrolysis and densify the composites efficiently. The densities of C/C preforms were important to the properties of C/C-SiC composites. The density, porosity and flexural strength of the composites derived from the preform with the density of 1.24 g/cm3 were 1.80 g/cm3, 7.32% and 220 MPa, respectively.

关 键 词：C/C-SIC复合材料 先驱体浸渍裂解 惰性填料 弯曲性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TB302.3