再生短碳纤维湿法取向技术及其增强性能分析  

Wet orientation technology of recycled short carbon fiber and analysis of its reinforcement performance

作　　者：李森[1] 黄海鸿[1] 刘威豪 阚峻峰 刘志峰[1] LI Sen;HUANG Haihong;LIU Weihao;KAN Junfeng;LIU Zhifeng(School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学机械工程学院,合肥230009

出　　处：《复合材料学报》2022年第3期1068-1078,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金优秀青年基金项目(51722502);国家自然科学基金面上项目(51775162)。

摘　　要：碳纤维/环氧树脂(CF/EP)复合材料具有力学性能优异、质量轻、耐腐蚀等特点,但成本高、废弃物环境影响大等问题制约了其进一步应用。现有方法回收的再生碳纤维(RCF)多为蓬松状的短纤维束,纤维互相缠绕,其优异的力学性能难以得到充分的利用。采用湿法纤维取向技术对不同长度的RCF进行重新取向排布,得到了相应的取向纤维毡,并用模压法制备了RCF/EP复合材料试样。利用二维方向张量对RCF的取向度(D_(PA))进行评价,采用SEM和力学性能测试表征复合材料的结构与性能。结果表明,RCF长度越长,取向越困难;RCF长度和D_(PA)的增加使复合材料的力学性能得到提高;与2 mm RCF相比,6 mm RCF的D_(PA)降低了约11%,而RCF/EP的拉伸强度和模量、弯曲强度和模量分别提升了63.6%、91.5%、48.8%、43.0%。Despite carbon fiber/epoxy(CF/EP)composites have the characteristics of excellent mechanical properties,light weight and corrosion resistance,problems such as high cost and severe environmental impact of waste restrict their further applications.Most of the recycled carbon fibers(RCF)recovered by the existing methods are fluffy,short and entangled with each other,which limit its mechanical properties.To address this issue,a wet fiber orientation technology was proposed to reorient and arrange RCF with different lengths.An oriented fiber felt was obtained via this method and RCF/EP fabricate specimens were prepared by compression moulding.The orientation tensor in the 2D plane was applied to evaluate the preferential alignment degree(D_(PA))of the fiber.The microstructure and properties of the composites were analyzed by SEM and mechanical tests,respectively.The results show that the increasing of RCF length leads to poor fiber orientation.The mechanical properties of the composites are improved with the increase of RCF length and D_(PA).Compared with 2 mm RCF,the D_(PA)of 6 mm RCF decreases by about 11%,whereas the tensile strength and modulus,flexural strength and modulus of the reinforced resin matrix composites increase by 63.6%,91.5%,48.8%and 43.0%,respectively.

关 键 词：纤维取向 短碳纤维 碳纤维增强树脂复合材料 回收再利用 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]