Abstract
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.
About the authors
Bahar Gökce, born in Ankara, Turkey in 1991, received her B. S. in 2015 from the University of Cukurova and M. S. in 2019 from Gazi University in Turkey. She worked at the ORS Rolling Contact Bearing Company until recently. Her research interests include wear, friction, lubrication.
Prof Dr. Necdet Geren, born in Akhisar, Turkey in 1963, received his PhD degree in 1993 from the Department of Aeronautical and Mechanical Engineering of University of Salford, UK. He is currently Prof. Dr. in the Department of Mechanical Engineering, University of Çukurova, Turkey. His research interests cover machine design, the design of machine members and the design of manufacturing systems. He is currently working on composite materials.
Prof. Dr. Mahmut İzciler, born in Eğirdir-Turkey in 1959, received his PhD from Fırat University in Turkey in 1997. He is currently Professor in the Manufacturing Engineering Department of Gazi University in Ankara, Turkey. His work at the university involves giving courses and conducting research in the areas of machining, industrial design and manufacturing processes, wear mechanisms and measurement methods.
Acknowledgment
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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