改性蒙脱石微粒在润滑油中分散稳定性对其摩擦学性能的影响  

Influence of Dispersion Stability of Modified Montmorillonite Particles in Lubricating Oil on Their Tribological Properties

作　　者：张永江 曹阳[1,2] 马雄位 许盛 王孟 ZHANG Yongjiang;CAO Yang;MA Xiongwei;XU Sheng;WANG Meng(College of Mechanical Engineering,Guizhou University,Guiyang Guizhou 550025,China;Engineering Training Center of Guizhou University,Guiyang Guizhou 550025,China)

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025 [2]贵州大学工程训练中心,贵州贵阳550025

出　　处：《润滑与密封》2020年第5期36-42,共7页Lubrication Engineering

基　　金：贵州省联合基金项目(黔科合LH字[2017]7236号);贵州大学2017年度学术新苗培养及创新探索专项(黔科合平台人才[2017]5788);贵州大学引进人才项目(贵大人基合字[2015]31号).

摘　　要：采用油胺、油酸、KH550、十六烷基三甲基溴化铵(CTAB)4种改性剂对经预处理的蒙脱石进行亲油性改性处理,研究分散剂添加量对改性蒙脱石在油液中分散稳定性的影响,并在四球摩擦磨损试验机上考察改性蒙脱石在油液中的分散情况对其摩擦学性能的影响。接触角与红外光谱分析结果表明,CTAB对蒙脱石的亲油性改性效果最优;吸光度测试结果表明,分散剂质量分数为6%时改性蒙脱石在油液中分散效果最佳。摩擦试验结果表明:蒙脱石在油液中的分散情况对其摩擦学性能影响很大,未添加分散剂的CTAB改性蒙脱石在基础油中分散不太稳定,摩擦因数相较于基础油仅降低了9.27%,加入分散剂后摩擦因数和磨斑直径相对于基础油分别降低了19.21%和40.29%。扫描电镜分析结果表明,在摩擦过程中蒙脱石微粒易沉积在磨损表面的低凹处,形成一层保护薄膜,起到降低接触面损伤和一定的修复作用,但蒙脱石微粒分散不好时则易发生团聚,增加表面磨粒磨损,降低其修复作用。The lipophilic treatment of the pretreated montmorillonite was conducted by four modifiers,oleamine,oleic acid,KH550 and cetyltrimethylammonium bromide(CTAB).The effect of the amount of dispersant on the dispersion stability of modified montmorillonite in oil was studied.The effect of the dispersion of modified montmorillonite in oil on its tribological properties were was investigated on a four ball friction and wear tester.The results of contact angle and infrared spectroscopy analysis show that CTAB has the best effect on the lipophilic modification of montmorillonite,and the absorbance test results show that when the mass fraction of dispersant is 6%,the modified montmorillonite has the best dispersion effect in oil.The results of friction and wear experiments show that the dispersion of montmorillonite in oil has a great influence on its tribological properties.CTAB modified montmorillonite without dispersant is not stable in the base oil,and its friction coefficient is only 9.27% lower than that of the base oil.While the oil with CTAB modified montmorillonite and dispersant can reduced the friction coefficient and wear scar diameter by 19.21% and 40.29% compared with base oil,respectively.The results of SEM analysis show that in the process of friction,the montmorillonite particles are easy to deposit in the low depression of the worn surface,forming a protective film,which can reduce the damage of the contact surface and play a certain role in repairing,but when the montmorillonite particles are not well dispersed,they are easy to agglomerate,which will increase abrasive wear and reduce the repairing effect.

关 键 词：改性蒙脱石 润滑油添加剂 分散剂 摩擦学性能 自修复膜 

分 类 号：TH117.1[机械工程—机械设计及理论]