连续同步复合法快速制备C/SiC复合材料

 连续同步复合法是一种建立在传统 CVI原理基础上的制备碳布增韧陶瓷基复合材料的新工艺 ,在制备过程中碳布通过连续缠绕在旋转的石墨衬底上 ,使纤维预制体的制备与基体的热解沉积同步进行 ,从而实现增韧相与基体在宏观和微观尺度上同步复合。通过控制反应物气体浓度、沉积温度与碳布缠绕线速度 ,达到控制微观孔隙网络与宏观孔隙的协调致密化。采用连续同步复合法制备碳布增韧 Si C基复合材料 ,实际密度可达其理论密度的 93 % ,制备周期显著缩短。

RAPID FABRICATION OF C/SiC COMPOSITES USING CONTINUOUS SYNCHRONOUS COMPOSITE PROCESSING

Continuous Synchronous Composite (CSC) is a novel process to fabricate ceramic matrix composites reinforced with carbon cloths, and is based on conventional chemical vapor infiltration(CVI) principles. In the CSC processing, carbon cloths continuously wind around the graphite substrate, so the continuous synchronous composite between reinforced phase and matrix is achieved, on a micro\| and macro\| scale, by means of synchronous conducting between pyrolysis deposition of matrix and preparation of preform. By means of controlling concentration of reactant gas CH 3SiCl 3(MTS), deposition temperature and carbon cloth rotational linear velocity, the filling of matrix into micro\|holes and macro\|holes is achieved correspondingly. The density of C/SiC composites fabricated using CSC processes can achieve 93% of the theoretical density.