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http://dx.doi.org/10.9725/kts.2018.34.6.254

A Study on the Tribological Characteristics of Low Friction Coating Deposited on SUJ2 Bearing Steel  

Kang, Kyung-Mo (Graduate School, Dept. of Mechanical Engineering, Yonsei University)
Shin, Dong-Gap (Graduate School, Dept. of Mechanical Engineering, Yonsei University)
Park, Young-Hun (Material Innovation Team, Advanced Material R&D Center, ILJIN Group)
Kim, Se-Woong (Material Innovation Team, Advanced Material R&D Center, ILJIN Group)
Kim, Dae-Eun (Graduate School, Dept. of Mechanical Engineering, Yonsei University)
Publication Information
Tribology and Lubricants / v.34, no.6, 2018 , pp. 254-261 More about this Journal
Abstract
In order to reduce resistance torque and energy loss, minimizing friction between race surface and rolling elements of a bearing is necessary. Recently, to reduce friction in bearing element, solid lubricant coating for the bearing raceway surface has been receiving much attention. Considering the operating conditions of real bearings, verifying the effect of solid lubricant coatings under extreme conditions of high load that is more than 1 GPa is necessary. In this study, we evaluated the friction and wear characteristics of SUJ2 bearing steels deposited by carbon-based coatings (Si-DLC, ta-C), $MoS_2$ and graphite. In case of $MoS_2$ and graphite coatings, different surface treatments were applied to the coatings to verify the effect of surface treatment. A pin-on-disc type tribotester was used to evaluate the tribological characteristics of the coatings. It was possible to quantitatively estimate the friction and wear characteristics of solid lubricant under dry and lubrication conditions. The carbon-based coatings improved the friction and wear properties of SUJ2 bearing steels under the high load condition, but $MoS_2$ and graphite coatings were not suitable for high load conditions due to its low hardness. Different friction and wear behaviors were found for different substrate surface treatment method. Also, it was confirmed that solid lubricant coatings had a more positive effect than just applying the lubricant for improving the tribological characteristics.
Keywords
sliding friction; high load; SUJ2 bearing steel; carbon-based coatings; wear;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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