Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Study on Tribological Behavior of Porous Anodic Aluminum Oxide with respect to Surface Coating

다공성 산화알루미늄의 표면코팅에 따른 트라이볼로지적 특성연구

  • Kim, Young-Jin (Dept. of Precision Mechanical Engineering, Kyungpook National University) ;
  • Kim, Hyun-Joon (Dept. of Precision Mechanical Engineering, Kyungpook National University)
  • 김영진 (경북대학교 과학기술대학 정밀기계공학과) ;
  • 김현준 (경북대학교 과학기술대학 정밀기계공학과)
  • Received : 2017.08.31
  • Accepted : 2017.10.31
  • Published : 2017.12.31
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Abstract

In this work, we have fabricated anodic aluminum oxide (AAO) with ordered nanoscale porosity through an anodization process. We deposited gold and nano-organic thin films on the porous AAO surface to protect its structure and reduce friction. We investigated the tribological characteristics of the porous AAO with respect to the protective surface coatings using tribometers. While investigating the frictional characteristics of the samples by applying normal forces of the order of micro-Newton, we observed that AAO without a protective coating exhibits the highest friction coefficient. In the presence of protective surface coatings, the friction coefficient decreases significantly. We applied normal forces of the order of milli-Newton during the tribotests to investigate the wear characteristics of AAO, and observed that AAO without protective surface coatings experiences severe damage due to the brittle nature of the oxide layer. We observed the presence of several pieces of fractured particles in the wear track; these fractured particles lead to an increase in the friction. However, by using surface coatings such as gold thin films and nano-organic thin films, we confirmed that the thin films with nanoscale thickness protect the AAO surface without exhibiting significant wear tracks and maintain a stable friction coefficient for the duration of the tribotests.

Keywords

References

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