Accessible Requires Authentication Published by De Gruyter September 11, 2021

Effect of substrate surface roughness on the wear of molybdenum disulphate coated rolling contact bearings

Bahar Gokce, Necdet Geren and Mahmut Izciler
From the journal Materials Testing


The objective of the present experimental work is to investigate the influence of subsurface roughness on the friction and wear performance of high-temperature ball bearing. Bearings, which are used in high-temperature applications, are affected by several operating conditions. Some factors under high-temperature conditions such as short grease life, thin-film thickness at low speed, and insufficient internal clearance can drastically reduce bearing service life due to an increase in surface friction. For this reason, rolling contact bearings are coated with molybdenum disulfide. Before the molybdenum disulfide (MoS2) coating, phosphatization is applied to the bearings. Because the phosphate layer is micro-porous, it assures that molybdenum disulfide is entrapped in the interstitials between the phosphates. Also, phosphate coating provides a much larger surface area for the lubricant to attach to. In this study, several process steps, sandblasting, manganese phosphate coating, molybdenum disulfide coating, friction moment testing, wear testing, wear depth measurement, SEM, and XRD analyses were carried out. Wear tests and friction moment tests were applied to the rings of bearings of varied raceway roughness. This process ultimately provides molybdenum disulfide coated bearings optimum raceway roughness parameters for good wear resistance and optimum boundary lubrication.

Department of Mechanical Engineering Cukurova University Faculty of Engineering Sarıçam, Adana 01330 Turkey


The authors would like to thank the management of the ORS Rolling Contact Bearing Company in TURKEY for the use of their equipment and their support or this work leading to a Master of Science degree.


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Published Online: 2021-09-11
Published in Print: 2021-09-30

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