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http://dx.doi.org/10.9725/kts.2021.37.3.106

Evaluation of Sliding Friction Properties of Laser Surface Texturing Dimple Pattern with DLC Coating under GaInSn Liquid Metal Lubricant  

Kwon, Gyubin (Dept. of Materials Science and Metallurgical Eng., Kyungpook National University)
Jang, Youngjun (Extreme Environmental Coating Dept., Korea Institute of Materials Science (KIMS))
Chae, Younghun (Institute of Engineering and Design, Kyungpook National University)
Publication Information
Tribology and Lubricants / v.37, no.3, 2021 , pp. 106-111 More about this Journal
Abstract
There are several studies on reducing the friction that occurs on the relative sliding contact surface of moving parts under extreme environments. In particular, a solid lubricated bearing is studied to solve the tribological problem with friction reduction and durability parts using solid lubricants (lead or silver) in a vacuum atmosphere. Galinstan is mainly used as a liquid metal lubricant, but it is inevitable to have limited tribological applications owing to its high coefficient of friction. Many researchers work on surface texturing for surface modification and precision processing methods. To increase durability and low friction, DLC coating with hydrophobicity is applied on the contact surface texture. Therefore, using an untextured specimen, a dimple specimen, and a DLC-coated dimple specimen under liquid metal lubrication, this paper presents the following experimental sliding friction characteristics in the sliding friction test. 1) The average coefficient of friction of the DLC-coated dimple specimen and dimple specimen are lower compared to that of a non-patterned specimen. 2) In the DLC-coated dimple specimens, the average coefficient of friction changes according to the change in the dimple density. 3) DLC-coated dimple specimens with a density of 12.5 have the lowest average coefficient of friction under 41.6 N of normal load and 143.3 RPM.
Keywords
dimple pattern; DLC(diamond like carbon); laser surface texturing; liquid metal lubricant; sliding friction;
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Times Cited By KSCI : 1  (Citation Analysis)
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