摘要
多孔聚酰亚胺(PI)应用广泛,但其摩擦磨损特性有待进一步提升。采用石墨烯纳米片(GNS)为改性剂,制备多孔PI复合材料,系统研究GNS填充剂对多孔PI材料的冲击性能、含油性能和摩擦学性能的影响,探究GNS、PI和润滑油三者的协调润滑机制。结果表明:添加一定量的GNS可以提高多孔PI材料的含油率和含油保持率。加入GNS填料后,复合材料的孔径和孔隙率均有所增大,使复合材料对油液的吸附力更强,提高了其贮油能力。复合材料的冲击强度随着GNS含量的变化为先升高后降低,少量的GNS分散在基体中,可以起到增韧的结果,而大量的GNS削弱了PI颗粒之间的结合性,且容易团聚导致界面结合性变差。添加0.5%GNS时,多孔PI复合材料表现出最佳的摩擦学性能,相比纯PI,摩擦因数降低了37.2%,磨痕宽度减小了26.5%。适量的GNS可以进一步提高材料的含油性能和摩擦性能。
Porous polyimide(PI)is widely used,but its friction and wear characteristics need to be further improved.Graphene nanosheets(GNS)were used as modifiers to prepare porous PI composites.The impact of GNS fillers on the impact performance,oil content and tribological properties of porous PI materials were studied,and the coordinated lubrication mechanism of GNS,PI and lubrications were explored.The results show that adding a certain amount of GNS can increase the oil content and oil retention rate of porous PI materials.After adding the GNS filler,the pore size and porosity of the composite material are increased,which makes the composite material have a stronger adsorption force for oil and improves its oil storage capacity.The impact strength of the composite material increases first and then decreases with the change of GNS content.A small amount of GNS is dispersed in the matrix,which can achieve toughening results,while a large amount of GNS weakens the bonding between PI particles.GNS is easy to agglomerate leads to poor interface bonding.When 0.5% GNS is added,the porous PI composite exhibits the best tribological performance.Compared with pure PI,the friction factor is reduced by 37.2%,and the wear scar width is reduced by 26.5%.A proper amount of GNS can further improve the oil-containing properties and friction properties of the material.
作者
李建勇
李锦棒
周宁宁
于爱兵
卿涛
张激杨
LI Jianyong;LI Jinbang;ZHOU Ningning;YU Aibing;QING Tao;ZHANG Jiyang(School of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China;Beijing Institute of Control Engineering,Beijing 100094,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2021年第5期25-33,共9页
China Surface Engineering
基金
宁波市科技创新2025重大专项(2018B10004,2019B10078)
浙江省自然科学基金(LY21E050003)
精密转动和传动机构长寿命技术北京市重点实验室开放基金(BZ0388201803)资助项目。
关键词
石墨烯
多孔聚酰亚胺
含油性能
冲击性能
摩擦磨损
graphene
porous polyimide
oily properties
impact performance
friction and wear
