摘要
为了研究表面改性纳米偏硼酸钙/还原石墨烯润滑添加剂的合成方法,以偏硼酸钙、还原石墨烯为原料,油酸为修饰剂,利用等离子体辅助球磨制备纳米偏硼酸钙/还原石墨烯复合粉体,并测试其摩擦学性能。采用扫描电镜、透射电镜、X射线衍射仪和红外光谱仪对纳米偏硼酸钙/还原石墨烯复合粉体进行形貌观察;采用形状测量激光显微镜、扫描电镜对摩擦副表面进行测试;采用MOAⅡ油液分析光谱仪对摩擦油样进行检测。结果表明:在钢球机械研磨和等离子体热效应的耦合作用下,等离子体辅助球磨10 h的偏硼酸钙与还原石墨烯继续球磨10 h后,被细化为10 nm左右的颗粒状,并均匀地负载于还原石墨烯上。等离子体快速加热使得偏硼酸钙粉体表面发生热爆,部分偏硼酸钙飞溅在还原石墨烯上,并随即被其包裹为球状复合结构。等离子体辅助球磨10 h为偏硼酸钙表面引入羧基基团,并在后续球磨中与还原石墨烯表面的羟基发生酯化反应,原位完成油酸对偏硼酸钙和还原石墨烯的表面改性,使得纳米偏硼酸钙/还原石墨烯复合粉体在5W-40型机油中具有良好的分散性。在摩擦过程中,比表面积大的还原石墨烯不断吸附在摩擦表面,同时被还原石墨烯包裹为球状的纳米偏硼酸钙粒子,使摩擦副表面产生多活动中心的滚动摩擦,从而有效改进复合油的减摩抗磨性能。
In order to study the preparation of surface modified nano-calcium metaborate/reduced graphene lubricant additives,nano-calcium metaborate/reduced graphene composite powders were prepared by plasma assisted ball milling with calcium metaborate and reduced graphene as raw materials and oleic acid as modifier,thier tribological properties were tested.The morphologies of nano-calcium metaborate/reduced graphene composites were observed by scanning electron microscope,transmission electron microscope,X-ray diffractometer and infrared spectrometer.The surface of the friction pair was tested by shape measuring laser microscope and scanning electron microscope.Oil samples were detected by MOAⅡoil analysis spectrometer.The results indicated that under the synergistic effect of ball milling and plasma heat effect,the calcium metaborate powder pre-milled for 10 h were refined to about 10 nm and uniformly loaded on the reduced grapheme after subsequent assisted ball milling for 10 h.The surface of calcium metaborate particles was heated rapidly by plasma and thermal explosion was caused,so part of the calcium metaborate powder splashed on the reduced graphene,which was then coated into a spherical composite structure.Plasma assisted ball milling introduced carboxyl groups on the surface of calcium metaborate after 10 h pre-milling and conducted an ester reaction with the hydroxyl group on the surface of reduced grapheme during subsequent 10 h milling.The surface modification of calcium metaborate and reduced graphene by oleic acid was in-situ completed successfully,and the prepared nano-calcium metaborate/reduced graphene composite powders had good dispersion in 5w-40 base oil.In the process of friction,the reduced graphene adsorbed on the friction surface due to its large specific surface area,and spherical nano-calcium metaborate coated by reduced graphene made the rolling friction of multi-activity centers on the friction pair surface,thereby the anti-friction and anti-wear performance of the composite oil was effectively improved.
作者
郭竟尧
侯显斌
魏钰坤
戴乐阳
廖海峰
孙迪
GUO Jingyao;HOU Xianbin;WEI Yukun;DAI Leyang;LIAO Haifeng;SUN Di(Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,School of Marine Engineering,Jimei University,Xiamen 361021,China;Fujian Shipping Research Institute of Jimei University,Xiamen 361021,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第20期20011-20015,共5页
Materials Reports
基金
国家自然科学基金(51779103)
福建省自然科学基金(2021J01848,2018J01498)
集美大学福建航运研究院开放课题基金。
关键词
纳米偏硼酸钙/还原石墨烯
润滑添加剂
等离子体辅助球磨
表面改性
摩擦学性能
nano-calcium metaborate/reduced graphene
lubricant additive
plasma assisted ball milling
surface modification
tribological properties
