碳纤维复合材料原位增材制造设备与工艺

In-situ additive manufacturing equipment and technology of carbon fiber composites

为了实现碳纤维增强热塑性复合材料(CFRTC)高质高效原位增材制造,设计一种激光聚焦加热CFRTC原位增材制造平台,以单向连续碳纤维增强聚醚醚酮热塑性复合材料(T800 CF/PEEK UD)预浸带为原材料开展CFRTC成型工艺相关研究.制备环形样件进行剪切强度测试表征,通过扫描电子显微镜观察样件的截面形貌,确立激光聚焦加热CF/PEEK的可行工艺参数窗口与较优工艺参数.结果表明,CF/PEEK成型件强度受激光聚焦加热温度、成型速度影响较大,均表现出随激光聚焦加热温度与成型速度的增加,先增大后减小,当成型速度为30 mm/s和激光加热温度为450℃时,环形样件有较高的剪切强度,并且表现出较少的微观缺陷.

A laser-assisted in-situ additive manufacturing platform for carbon fiber reinforced thermoplastic composites(CFRTC)was designed to achieve high quality and effcient in-situ additive manufacturing of CFRTC.The manufacturing process parameters were investigated by taking example of contimuaus carbon fiber reinforced thermoplastics T800 CF/PEEK UD prepreg strip.The several circle specimens were prepared to measure the shear strength and the cross-sectional morphology of the specimen was observed through a scanning electron microscope,which helped to determine the feasibility parameters range and optimal process parameters.The results showed that the strength of the manufactured CF/PEEK parts was greatly affected by the temperature and speed.The shear strength increased at first and then decreased with the increase of both the temperature and speed.The maximum of shear strength as well as the minimum micro-defect were achieved when the temperature was 450℃and the speed was 30 mm/s.