超声振动对不同含量碳纤维增强聚丙烯制件性能的影响  

Effect of Ultrasonic Vibration on Properties of Polypropylene Reinforced with Different Carbon Fiber Contents

作　　者：刘莹[1] 杨勇 于同敏[1] 赵雪利 马赛 祝铁丽[1] Ying Liu;Yong Yang;Tongmin Yu;Xueli Zhao;Sai Ma;Tieli Zhu(State Key Laboratory of High-Performance Precision Manufacturing,School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学机械工程学院高性能精密制造全国重点实验室,辽宁大连116024

出　　处：《高分子材料科学与工程》2023年第12期80-87,共8页Polymer Materials Science & Engineering

基　　金：国家重点研发计划项目(2022YFB3806203);国家自然科学基金资助项目(52205339,51575080)。

摘　　要：利用超声辅助振动注塑模具,针对3种不同质量分数(10%,15%和20%)的碳纤维增强聚丙烯(CFPP)复合材料,进行了底部带有标准拉伸试样的壳体制件的成型实验。借助X射线衍射、扫描电镜等观测分析及拉伸性能测试,研究了超声振动外场作用下,不同碳纤维含量的制件内部结晶度及凝聚态结构中碳纤维的空间形态,以及碳纤维与基体接触界面的结合强度对制件力学性能的影响。结果表明,在CFPP制件注塑成型的填充流动阶段施加600W功率的超声振动,上述不同碳纤维含量的制件结晶度分别提高了4.4%,7.4%和9.8%,纤维取向程度分别提高了5.2%,9.7%和3.5%,纤维与基体的结合强度分别提高了32.5%,12.7%和12.6%,最终使得制件的拉伸强度相比于未施加超声振动时分别提高了6.9%,6.2%和10.4%;但超声功率高达到900W时,结晶度和纤维与基体的结合强度有所下降,导致制件拉伸强度有所降低。Using polypropylene composites reinforced with different mass fractions of carbon fiber(10%,15%and 20%),the molding experiments assisted by ultrasonic vibration were carried out for shell parts with standard tensile specimen at the bottom.By XRD,SEM and tensile test,influences of ultrasonic vibration on the crystallinity,fiber orientation,bonding strength of the contact interface between carbon fiber and matrix and tensile strength of the parts were studied.It is found that when the ultrasonic vibration of 600 W is applied to the filling stage of injection molding,the crystallization degree of the parts with 10%,15%and 20%carbon fiber content is increased by 4.4%,7.4%and 9.8%,and the fiber orientation degree is increased by 5.2%,9.7%and 3.5%,respectively.The bonding strength between carbon fiber and matrix is increased by 32.5%,12.7%and 12.6%,resulting in the tensile strength of the parts increased by 6.9%,6.2%and 10.4%,respectively.However,when the ultrasonic power rises to 900 W,both the crystallization degree and bonding strength between carbon fiber and matrix decrease,resulting in a decrease in the tensile strength of the parts.

关 键 词：超声振动 碳纤维增强聚丙烯 凝聚态结构 拉伸强度 

分 类 号：TB332[一般工业技术—材料科学与工程]