高性能C/C复合材料制备工艺研究

Preparation of High Performance C/C Composites

对制备C/C复合材料的化学气相渗透工艺进行了系统的实验研究,着重分析了热解碳的沉积过程。研究表明,在化学气相渗透的初始阶段,热解碳主要在碳纤维表面沉积,并与碳纤维之间形成了界面结合;随后,热解碳的沉积继续填充碳纤维预制体内部的气孔。这一过程有助于缓解纤维与陶瓷基体之间的界面应力。研究表明,通过调节热解碳的沉积时间可以得到具有一定密度梯度的C/C复合材料。

A systematically experimental study was conducted on the chemical vapor infiltration（CVI） process for preparing C/C composites, with a special emphasize on the deposition process of pyrolytic carbon. It was shown that, at the initial stage of CVI, the pyrolytic carbon was mainly deposited on the surface of carbon fiber to form a fine interface. As the CVI continues, the pores in the carbon fiber preform were filled with the pyrolytic carbon generally, which is beneficial to the release of the interfacial stress between the fiber and the matrix. By adjusting the deposition time, the composite with a density gradient can be obtained.