摘要
为了提高石墨与环氧树脂(EP)的界面粘接能力,使用异氰酸酯和硅烷偶联剂对石墨进行联合改性,并探究了改性石墨(MG)对EP的磨损行为影响。通过傅里叶变换红外光谱仪测试和扫描电子显微镜(SEM)测试证实了二苯甲烷二异氰酸酯和硅烷偶联剂KH550成功接枝到石墨上,并形成了杏叶状石墨。又通过拉伸性能测试、冲击测试、摩擦磨损测试和SEM表征,分析了MG含量和界面形态对EP/MG复合材料摩擦磨损性能的影响,评估了磨损的机理。最后得出,MG质量含量为4%时,EP/MG复合材料的拉伸强度达到最大值38.527MPa,是纯EP的2.17倍。MG质量含量为6%时,EP复合材料冲击强度达到最大值19.777kJ/m2,是纯EP的2.77倍,并且载荷为40 N时,MG质量含量为6%的EP/MG复合材料的摩擦磨损性能最好,磨损率最低达到3.2×10-4mm3/(N·m)。摩擦磨损的主要机理是粘着磨损。
In order to improve the interfacial bonding ability between graphite and epoxy resin,graphite was modified by using isocyanate and silane coupling agent,and the effect of modified graphite(MG)on the wear behavior of epoxy resin(EP)was investigated.Fourier transform infrared spectrometer test and scanning electron microscope(SEM)test confirm that diphenylmethane diisocyanate and silane coupling agent KH550 are successfully grafted onto graphite and form apricot-leaf graphite.The effects of MG content and interface morphology on the friction and wear properties of EP/MG composites were analyzed by tensile test,impact test,friction and wear test and SEM,and the wear mechanism was evaluated.Finally,the tensile properties of EP/MG composite with 4%MG content reach the maximum 38.527 MPa,which is 2.17 times that of pure EP.When MG content is 6%,the maximum impact strength reaches 19.777 kJ/m2,which is 2.77 times that of pure EP,and the friction and wear performance of EP/(6%MG)composite is the best,with the lowest wear rate reaching 3.2×10^(-4)mm3/(N·m).The main mechanism of friction and wear is adhesive wear.
作者
焦晓岚
邓鑫
郑玲
周依莎
Jiao Xiaolan;Deng Xin;Zheng Ling;Zhou Yisha(School of materials science and engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Key Laboratory of Material Surface Interface Science and Technology,Central South University of Forestry and Technology,Changsha 410004,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2022年第6期19-24,共6页
Engineering Plastics Application
基金
国家自然科学基金青年基金项目(51203193)
材料表界面科学与技术湖南省重点实验室开放课题。
关键词
石墨
环氧复合材料
磨损机理
改性
graphite
epoxy composite
wear mechanism
modification
