유한요소해석에 의한 DLC 코팅면의 마멸기구에 대한 연구

Abstract

Various heat treatment and surface coating methods have been applied to machine parts. Nowadays,diamond-like carbon (DLC) coatings are widely used because of their excellent tribological characteristics. Despite the numerous studies on DLC-coated engineering surfaces, the exact wear mechanisms related to thecoating thickness and elastic modulus have not been fully examined. In this study, a sliding contact problembetween a small spherical hard particle and a DLC-coated steel surface is analyzed using a nonlinear finite elementcode, MARC. The maximum principal stress distributions and deformed surfaces are compared for differentcoating thicknesses and Young’s modulus values. Plastically deformed surface shapes such as a groove and torusindicate that the most dominant wear mechanism for a DLC-coated surface is abrasive wear. Fatigue wear canalso play a role in a case where the coating thickness is relatively large and the elastic modulus is high.