| Summary: | 碩士 === 逢甲大學 === 材料科學學系 === 87 === For wear reduction, the application of bearing is widely used in industry. There are two parts of ambit: rolling bearing and sliding bearing. The unique lubrication property of solid lubricant drive our attention to its application to rolling bearing, In this study, an NiP-MoS2 solid lubricant composite plating was employed to apply to rolling bearing element, while conventional fluid lubrication was also compared to reveal the possibility in application.
A triibo-test rig was constructed. A bike bottom bracket assembly was chosen as rolling bearing element. Wear test was carried out under the conditions of dry, oil lubrication, solid film lubrication and a combination of the later two. Experimental results clearly show that combinative lubrication can most beneficially prolong life expectancy of the assembly, while oil lubrication and solid lubrication are comparable to each other. Specimens tested under dry condition show maximal roughness of rolling ball and maximal wear scare on cup and cone, comparing to those conditions under lubrication.
For the rolling bearing element, solid lubrication shows no benefit to friction coefficient while the steady of friction coefficient and the durability can be obtained the contribution of preventing adhesion is more significant than reducing the friction coefficient. It also shows beneficially in reducing the preload sensitivity of rolling bearing elements.
In addition, wear mode is significantly different for those bearings under different lubrication. Dry wear leads to adhesion wear with a lot of mass transfer. Oil lubrication is predominantly abrasion wear by means of publishing. Solid lubrication exhibits flaking wear categorized in surface fatigue. Combinative lubrication reveals pitting wear with a lot of pores created on the surface.
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