粗糙层组织结构2D-C／C复合材料的制备及特性  

Preparation for 2D-C/C composites with pure RL textures and its characteristic

作　　者：和永岗[1] 李克智[1] 李贺军[1] 郭领军[1] 周宝平 

机构地区：[1]西北工业大学炭／炭复合材料工程技术研究中心,西安710072 [2]晋西机器工业集团有限责任公司产品设计研究所,太原030027

出　　处：《材料研究学报》2009年第2期138-142,共5页Chinese Journal of Materials Research

基　　金：高等学校学科创新引智计划D08040资助项目.~~

摘　　要：在沉积温度为1080-1200℃、沉积总压力为10 kPa和气体滞留时间为0.01 s的条件下,以天然气为碳源,以氮气为载气,使用新型ICVI工艺对预制体初始密度为0.43 g/cm^3(纤维体积分数25%)的2D针刺整体炭毡进行致密化,在150 h内制备出表观密度为1.75 g/cm^3的C/C复合材料.用偏光显微镜和高分辨扫描电镜观察了热解碳基体的微观组织结构,分析了三点弯曲试样的断口形貌.结果表明:制备的C/C复合材料具有粗糙层(RL)组织结构,试样的弯曲强度为164.77 MPa、模量为21.34 GPa,表现为阶梯式失效,断裂行为呈现出明显的假塑性.A 2D carbon fiber preform （bulk density 0.43 g/cm^3） was infiltrated by novel ICVI in temperature 1080-1200℃, pressure 10 KPa, gas residence time 0.01 s, using natural gas as carbon source, N2 as diluent gas, and the C/C composites were obtained. The flexural strength was measured by threepoint bonding tests, the microstructures of pyrocarbon matrix and the morphologies of fractured surfaces were observed by polarized light microscopy （PLM） and scanning electron microscopy （SEM）. The results show that the bulk density of 2D-C/C composites manufactured in 150 h is 1.75 g/cm^3, its texture is pure rough laminar, flexural strength and flexural modulus are 164.77 MPa and 21.34 GPa respectively. The fracture of C/C composites exhibits a pseudo-plastic failure behavior.

关 键 词：复合材料 C/C复合材料 化学气相渗透 致密化 组织结构 

分 类 号：TB332[一般工业技术—材料科学与工程]