挤压力对CF/EP复合材料微观结构与弯曲性能的影响  

Effect of extrusion pressure on microstructure and bending properties of CF/EP composite

作　　者：张育洋 马玉钦 王浩 王英皓 张战 ZHANG Yuyang;MA Yuqin;WANG Hao;WANG Yinghao;ZHANG Zhan(School of Aeronautical Engineering,Shaanxi Industrial Polytechnic,Xianyang 712000;Key Laboratory of Road Construction Technology and Equipment of Ministry of Education,School of Engineering Machinery,Chang′an University,Shaanxi 710064;Xianyang Intellectual Property Office,Xianyang 712000)

机构地区：[1]陕西工业职业技术学院航空工程学院,陕西咸阳712000 [2]长安大学工程机械学院道路施工技术与装备教育部重点实验室,陕西西安710064 [3]咸阳市知识产权局,陕西咸阳712000

出　　处：《合成纤维工业》2023年第2期24-28,共5页China Synthetic Fiber Industry

基　　金：陕西省教育厅科学研究计划项目资助(22JK0266)。

摘　　要：以E44环氧树脂(EP)为基体、T700单向碳纤维(CF)布为增强体,在挤压力为1~5 MPa条件下,采用液态浸渗的方法制备CF/EP复合材料层合板,研究了挤压力对CF/EP复合材料层合板微观组织及弯曲性能的影响。结果表明:挤压力过低影响EP基体的浸渗效果,CF不能发挥增强体作用,挤压力过高会将已经浸渗到CF预制体的EP被部分压出;挤压力为3 MPa时,EP基体在CF中浸渗充分且均匀,纤维与基体结合紧密,浸渗效果好,有效增强了复合材料的承载能力;随着挤压力的增大,CF/EP复合材料的弯曲强度和最大弯曲力均呈现先增大后降低的趋势,当挤压力为3 MPa时,CF/EP复合材料的弯曲强度和最大弯曲力均最大,分别为465 MPa、383.17 N;制备CF/EP复合材料层合板的最佳挤压力为3 MPa,此时复合材料断裂整齐,基体的断裂模式为韧性断裂,复合材料的弯曲性能最佳。Using E44 epoxy resin(EP)as matrix and T700 unidirectional carbon fiber(CF)cloth as reinforcement,CF/EP composite laminates were prepared by liquid infiltration method under an extrusion pressure of 1-5 MPa.The effects of extrusion pressure on the microstructure and bending properties of CF/EP composite laminates were studied.The results showed that extremely low extrusion pressure impacted the infiltration effect of EP matrix and caused that CF could not play the role of reinforcement,while extremely high extrusion pressure caused the partial press-out of EP that had been infiltrated into the CF preform;the EP matrix was fully and uniformly infiltrated in the CF and the fiber was tightly bonded to the matrix,indicating a good infiltration effect which effectively enhanced the bearing capacity of the composite,when the extrusion pressure was 3 MPa;the bending strength and maximum bending force of CF/EP composite increased first and then decreased with the increase of extrusion pressure and was maximized as 465 MPa and 383.17 N,respectively,when the extrusion pressure was 3 MPa;and the composite broke neatly with the ductile fracture mode of the matrix and exhibited the best bending property when the extrusion pressure for preparing CF/EP composite laminates was optimized as 3 MPa.

关 键 词：碳纤维 环氧树脂 复合材料 液态浸渗 挤压力 微观结构 弯曲性能 

分 类 号：TQ342.742[化学工程—化纤工业]