The influence of various grease compositions and silver nanoparticle additives on electrically induced rolling-element bearing damage
作者机构：Department of Chemistry and BiochemistryAuburn UniversityAuburn 36849-5412USA Department of Mechanical EngineeringAuburn UniversityAuburn 36849-5412USA
出 版 物：《Friction》 (摩擦（英文版）)
年 卷 期：2024年第12卷第4期
页 面：796-811页
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术]
基 金：Timken Company NLGI
主 题：electric motor bearings wheel bearings electric vehicles arcing electrically induced bearing damage pitting leakage current stray current
摘 要：Leakage currents accelerate surface degradation of metal contacts via small scale arcing across lubricating films,but recent observations suggest that metallic nanoparticle additives in lubricants may be useful to improve contact *** findings prompted a study that examined electrically induced surface pitting of steel contacts in the presence of several lubricating greases including some containing nanometer-sized colloidal silver(Ag)*** rolling sphere-on-disk experiments were conducted under electro-tribological loads employing polyurea greases derived from mineral and synthetic base oils with and without *** forces and electrical resistance were monitored continuously during the tests;surface changes were characterized by means of optical spectroscopy,stylus profilometry,and scanning electron microscopy(SEM)including compositional analysis using energy dispersive spectroscopy(EDS).The observations demonstrate that surface pitting induced by arcing occurs mainly at the points were the rolling motion changes direction and that eroded metal is deposited along the wear ***-sized pits are formed which contain carbon and oxygen indicating that arcing causes decomposition of the hydrocarbon *** findings indicate a significant inhibition of pitting is induced by the Ag nanoparticles;some greases containing other additives exhibit a similar,although less pronounced,effect.
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