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http://dx.doi.org/10.9725/kstle.2017.33.5.220

Study on Influence of Carbon Nanotubes and Alumina Additives to Lubrication and Wear Characteristics  

Yun, Chang-Seok (Dept. of Precision Mechanical Engineering, Kyungpook National University)
Oh, Dae-San (2nd Land Systems Team, Defense Agency for Technology and Quality)
Kim, Hyun-Joon (Dept. of Precision Mechanical Engineering, Kyungpook National University)
Publication Information
Tribology and Lubricants / v.33, no.5, 2017 , pp. 220-227 More about this Journal
Abstract
In this work, carbon nanotube and nano-size alumina particle are exploited as additive for lubrication experiment. We used pin-on-disk type tribometer to investigate the tribological characteristics of lubricants with respect to additives and rotational speed. We conducted more than 15 trials of tribotests for two hours for each specimen to obtain stable and accurate frictional force and to create measurable wear track on the substrate. We conducted tests at the boundary/mixed lubrication regime to evaluate the influence of additives on the tribological characteristics. We found that the friction coefficient decreased as the rotational speed increased and as additives were added. In particular, the reduction of friction by adding additives was more significant at low rotational speed than at high rotational speed. We speculate that the additives helped to separate and protect the two contacting surfaces at low speed, while the influence of additives was not significant at high speed since sufficiently thick lubricant film was formed. The wear of the substrate was also reduced by adding additives to the lubricant. However, in contrast to friction, the amount of wear at high rotational speed was less when alumina particles were added to the lubricant than the amount of wear at low speed. We speculate that the increased wear at low rotational speed is as a result of the intermittent abrasive wear caused by alumina particles with uneven shape, while the reduced wear at high speed is as a result of sufficient film thickness which prevented the abrasive wear.
Keywords
lubrication; additives; carbon nanotube; alumina particle;
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Times Cited By KSCI : 1  (Citation Analysis)
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