碳纳米管膜用于碳纤维增强树脂基复合材料的电热固化技术

Carbon fiber reinforced resin matrix composite curing by carbonnanotube film resistance heating

为探索碳纳米管膜用于树脂基复合材料电热固化成型的工艺适用范围和应用前景,以CCF800H/EC120A碳纤维增强环氧预浸料为研究对象,用柔性碳纳米管膜对其电热固化处理。为优化电热固化工艺,对比了真空电热固化和模压电热固化对复合材料内部质量、玻璃化转变温度、力学性能及微观形貌的影响,以考察真空度和外压在电热固化过程中的作用。研究结果表明,碳纳米管膜可实现快速、均匀的加热;与模压电热固化相比,碳纳米管膜真空电热固化工艺所得复材板的内部质量好,玻璃化转变温度高,力学性能更优异,表明在该预浸料的电热固化过程中,真空度比外压对复材板成型质量和性能控制的作用更显著;与传统烘箱固化方式相比,真空电热固化复材板的弯曲强度保持率为90%,弯曲模量相当,层剪性能差距较小。

To explore the application universality and prospect of carbon nanotube film(CNTF)in curing of resin-matrix composites via resistance heating,CCF800H/EC120A carbon fiber reinforced resin matrix composites were treated by CNTF electric heating cure.To optimize the electrothermal curing process,effects of electricthermal cure processes assisted with vacuum and with press mould on internal quality,glass transition temperature,mechanical properties and microstructure of composites were compared,thus identifying the roles of vacuum degree and external pressure in the electrothermal curing process.The results show that the CNTF can achieve rapid and uniform heating.Compared with press-moulded composite laminates cured by CNTF,composite laminates cured by CNTF within vacuum sealed bag own better internal quality,higher Tg and higher mechanical property,indicating that during the cure process of such prepreg,vacuum degree plays a more significant role than the external pressure in controlling internal quality and performance of obtained laminates.Bending strength of laminates cured by CNTF within vacuum sealed bag maintains at 90%of that cured by traditional oven cure,bending moduli of both cure methods are similar and laminar shear properties also show minor differences.