先驱体转化法制备C/C-SiC复合材料研究  

PREPARATION OF C/C-SiC COMPOSITES BY PRECURSOR INFILTRATION AND PYROLYSIS

作　　者：杜红娜[1] 杜红亮[1] 周万城[1] 朱冬梅[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《炭素技术》2006年第6期19-22,共4页Carbon Techniques

摘　　要：以多孔C/C复合材料为预制型,聚碳硅烷(PCS)为先驱体,制备了C/C-SiC复合材料。研究了浸渍液浓度和不同C/C复合材料预制体密度等级对C/C-SiC复合材料的密度和力学性能的影响。结果表明:当浸渍液浓度为50%时,复合材料的密度均达到最佳值;不同的预制体密度对制得的复合材料性能有很大的影响,其中初始密度为1.2g/cm3试样制得的复合材料性能达到最优,其密度达到1.786g/cm3,弯曲强度达204.1MPa,剪切强度为16.1MPa,断裂韧性为6.83MPa·m1/2。C/C-SiC composites were fabricated with polycarbosilane（PCS） as precursor and porous C/C compesites as preform by infiltration and pyrolysis. The effects of different impregnant concentration and preform＇s density gradation on the density and mechanical property of C/C - SiC composites were investigated. The results show that C/C - SiC compesites densities were influenced significantly by the infiltration liquid concentration. The density of C/C - SiC compesites reached the optimal value when polycarbosilane precursor concentration is 50%; the C/C preform＇s densities were important to C/C - SiC composites property. The density, flexural strength, shear strength and fracture toughness of the composites derived from the preform with the density of 1. 2 g/cm^3, were 1. 786 g/cm^3, 204. 1 MPa, 16. 1 MPa and 6. 83 MPa·m^1/2, respectively.

关 键 词：C/C—SiC复合材料 聚碳硅烷 先驱体浸渗裂解 

分 类 号：TB332[一般工业技术—材料科学与工程]