摘要
采用熔融挤出法、阳极氧化法和叠层模压法制备了二元、三元和四元尼龙6(PA6)基复合材料。利用场发射扫描电子显微镜对多尺度增强体增强PA6基复合材料的冲击断口形貌进行了表征,研究了无机颗粒(IP)、碳纤维(CF)和金属增强的尼龙6复合材料的冲击性能。结果表明:(1)无机颗粒和碳纤维多尺度增强PA6具有一定的协同效应,可以显著提高复合材料的冲击性能;(2)微米级玻璃微珠(micro GB)在冲击应力下发生脱粘,对裂纹扩展有偏转和钉扎等作用;(3)纳米级CaCO3(nano CaCO3)在冲击应力下发生脱粘的同时还产生了微裂纹和银纹,协助玻璃微珠和碳纤维产生增强效果;(4)纤维金属层板在冲击应力下的失效方式为纤维脱粘、断裂和拔出,基体拉伸断裂,金属的塑性形变、断裂与氧化层开裂,以及金属与基体界面脱粘。
This paper studies the effect of different reinforcements on the impact properties and synergistic reinforcement of nylon 6 composites,and analyzes the reasons for its enhancement.The binary,ternary and quaternary nylon 6(PA6)matrix composites were fabricated by melt-extrusion,anodic oxidation and hot pressing method.The fracture morphologies of multi-scale reinforcement reinforced PA6 matrix composites under impact stress were characterized by FESEM.The impact properties and reinforcement mechanisms of inorganic particles(IP),carbon fibers(CF)and metal-reinforced nylon 6 composites were studied.The results show that:(1)There is a certain synergistic effect in inorganic particle and carbon fiber multi-scale co-reinforced PA6 matrix composites,which can significantly improve the impact properties of the composites.The impact strength of GB,CF,and metal co-reinforced PA6 composite reaches 94.7 kJ/m^2.(2)Micron-sized glass beads(micro GB)debond under impact stress,which deflected and pinned the crack propagation.(3)Nano CaCO3 debonds under impact stress and produces the micro-cracks and crazes,which help the reinforcement of the glass beads and carbon fibers.(4)The failure modes of fiber metal laminate under impact stress are the debonding,fracture and pull-out of fiber,tensile fracture of the matrix,the plastic deformation,fracture and oxide layer cracking of the metals,and the interfacial debonding of the metal to substrate.
作者
李艳
尹洪峰
秦月
杨顺
LI Yan;YIN Hong-feng;QIN Yue;YANG Shun(College of Materials Science and Engineering,Xi′an University of Architecture and Technology,Xi'an 710055,China)
出处
《复合材料科学与工程》
CAS
北大核心
2020年第12期84-91,共8页
Composites Science and Engineering
