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http://dx.doi.org/10.9725/kts.2019.35.6.389

Comparison of Friction and Wear Characteristics of Thin Film Coatings Using Tribotesters at Atmospheric/Vacuum Conditions  

Kim, Hae-Jin (School of Mechanical and Aerospace Engineering, Gyeongsang National University)
Kim, Dae-Eun (Dept. of Mechanical Engineering, Yonsei University)
Kim, Chang-Lae (Dept. of Mechanical Engineering, Chosun University)
Publication Information
Tribology and Lubricants / v.35, no.6, 2019 , pp. 389-395 More about this Journal
Abstract
In various industries, thin film coatings are used to improve friction and wear characteristics. Various types of tribotesters are used to evaluate the friction and wear characteristics of such thin film coatings. In this study, we fabricated a micro-tribotester and Tribo-scanning electron microscopy (SEM) to compare the friction and wear characteristics of copper (Cu) coatings under an atmospheric pressure and a vacuum condition, respectively. The reliability of the different types of tribotesters was evaluated by performing calibrations for the sensor to measure the friction forces and normal loads. Using the two different types of devices, the friction and wear tests are conducted at the same experimental conditions excluding environment conditions such as the atmospheric pressure and vacuum condition. The friction coefficient at the vacuum condition is lower than at the atmospheric pressure. This difference in friction characteristics is due to the fact that wear phenomena occur differently according to the atmospheric pressure and vacuum condition. At the atmospheric pressure, the abrasive wear is the main wear mechanism. At the vacuum condition, the adhesive wear is the main wear mechanism. The reason for the difference in the wear mechanism of the Cu coating at the atmospheric pressure and the vacuum condition is that the oxidation phenomenon, which does not appear at the vacuum condition, occurs at the atmospheric pressure; therefore, the characteristics of the Cu coating change accordingly.
Keywords
atmospheric pressure; coating; friction; vacuum; wear;
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Times Cited By KSCI : 3  (Citation Analysis)
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