Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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The Effects of Surface Porfiles and Coatings on the Tribological Behaviors of the Surfaces of Piston Skirt

피스톤 스커트 표면의 트라이볼로지 거동에 미치는 표면형상과 코팅의 영향

  • 조대현 (성균관대학교 기계공학과) ;
  • 정순오 (성균관대학교 기계공학과) ;
  • 원영덕 (성균관대학교 기계공학과) ;
  • 한만철 (한국생산기술연구원) ;
  • 이영제 (성균관대학교 기계공학과)
  • Published : 2008.06.30
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Abstract

To reduce the friction losses and the wear amounts in the piston assembly two methods were proposed. One is the modification of surface profile of the skirt part. The surface coating is another method to protect the sliding surfaces. To modify the profile of the skirt surfaces the surfaces were ground to have three different shapes of profiles. Also, several coatings, such as graphite, TiN, and $MoS_2$, and DLC, were used to protect the surfaces of the piston skirts. The specimens of the skirt and the cylinder bores were tested with the reciprocating wear tester. SAE 5W40 engine oil was used in boundary lubrication regime. Among several coatings the graphite and DLC coatings were very effective to reduce the friction forces. Especially, DLC film represented much better tribological performances than the others. The friction coefficient of the graphite coating was the lowest, but the graphite coating was not effective to protect the surfaces.

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References

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