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在炭纤维预制件中添加石墨烯,以天然气为碳源,氢气为稀释气,采用等温化学气相渗透技术制备炭/炭复合材料。采用金相显微镜和扫描电镜研究预制件和炭/炭复合材料的微观结构,采用万能试验机测试复合材料的弯曲强度。结果表明:石墨烯零散地附着在预制件的炭纤维表面,化学气相渗透增密时,添加0.1%墨烯的预制件增密速率提高10%以上,沉积75 h密度达到1.50 g/cm3左右,制得的炭/炭复合材料弯曲强度提高30%以上,这主要由于石墨烯的加入提高了增密速率,同时起到增强体的作用。
Graphene was added into the carbon fiber preform, natural gas was used as carbon source and hydrogen was used as diluent gas. The isothermal chemical vapor permeation technique was used to prepare carbon / carbon composites. The microstructure of the preform and the carbon / carbon composite was investigated by optical microscopy and scanning electron microscopy. The flexural strength of the composites was tested by a universal testing machine. The results show that when the graphene is attached to the carbon fiber surface of the preform, the densification rate of the preform with 0.1% of the remnant increases more than 10% and the densification rate reaches 1.50 g / cm3 after 75 h of deposition. The flexural strength of the obtained carbon / carbon composites increased more than 30%, which is mainly due to the graphene added to improve the densification rate, at the same time to enhance the role of the body.