超声球磨活化处理后纳米WS_2颗粒在基础润滑油中的分散稳定性及机理  

Dispersion Stability and Mechanism of Nano-WS_2 Particulates in Base Lubrication Oil after High Power Ultrasund/Ball-milling/Surface Modification Treatment

作　　者：毛大恒[1] 刘阳[1] 石琛[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083

出　　处：《机械工程材料》2013年第7期53-57,共5页Materials For Mechanical Engineering

基　　金：国家"973"计划资助项目(2010CB731701);国家重大专项资助项目(2010ZX04017-013)

摘　　要：用自制的超声球磨试验装置采用不同的分散方法(球磨搅拌分散,球磨搅拌、表面活性剂分散,强超声、球磨搅拌、表面活性剂分散)将纳米WS2颗粒分散于PAO6基础润滑油中,研究了纳米WS2颗粒在基础油中的分散稳定性以及表面活性剂对纳米WS2颗粒分散稳定性的影响,并对其分散机理进行了分析。结果表明:强超声、球磨搅拌、表面活性剂分散的复合处理对提高纳米WS2颗粒在基础油中分散稳定性的效果最好,其机理是将基础油中的纳米WS2团聚体解聚,并使解聚后的纳米WS2颗粒表面活性增强,表面特性由亲水疏油转变为亲油疏水,经表面修饰后的纳米WS2颗粒被长碳链极性分子和润滑油分子所包围,形成空间位阻层和溶剂化层共同作用防止纳米颗粒的碰撞团聚,使得解聚后的纳米WS2颗粒长期稳定地分散在基础油中。Nano WS2 particulates were dispersed in PAO6 base lubrication oil by using the methods of ball- milling stir, ball-milling stir/surface modification and high power ultrasound/ball-milling stir/surface modification on homemade ultrasonic/ball milling experimental device, the dispersion stability of nano WSe particulates in base oil and the effect of surface modifier on diepersion stability of WS2 were studied, and the despersive mechanism was analysed, too. The results show that the dispersion state of the nano WS2 particulates was best after compound action of high power ultrasonic/ball-milling stir/surface modification. The mechanism show that compound action of high power ultrasonic/ball-milling stir/surface modification could break up the nano-WS2 agglomerations and then strengthen the surfactivity of nano WS2 particulates, and thus lead to the change of particulatesr surface characteristics from hydrophilicity to lipophilicity, After surface modifying, the long carbon chains on WS2 surface could form stereo-hindrance layer, combined with solvation layer formed by lubricant molecule, to prevent nanometer particulates from aggregate, and ultimately made nanometer WS2 particulates dispered in baseoil stably for a long time.

关 键 词：强超声 球磨搅拌 纳米WS2 颗粒 表面活化 分散稳定性 

分 类 号：TH117.2[机械工程—机械设计及理论]