Friction Characteristics of DLC and WC/C

Kim, Dong-Wook; Kim, Kyung-Woong

doi:10.9725/kstle.2011.27.6.308

Journal of the Korean Society of Tribologists and Lubrication E

2011

DOI: 10.9725/kstle.2011.27.6.308

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Friction Characteristics of DLC and WC/C

Dong-Wook Kim¹,

Kyung-Woong Kim²

Abstract: − In this study, friction tests were performed in order to investigate the effect of sliding velocity and normal load on the friction characteristics of DLC (a-C:H) and WC/C (a-C:H:W) using a ball-on-disk type friction tester. DLC and WC/C were deposited on AISI 52100 steel balls. Friction tests against carburized SCM 415 Cr-Mo steel disks were carried out under various sliding velocity (0.1, 0.78, 1.56, 3.13, 6.25, 12.5, 25, 50 and 100 mm/s) and normal load (2.4, 4.8 and 9.6 N) conditions while the relative h… Show more

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Cited by 2 publications

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A Study on Wear Mechanism in Diamond-like Carbon Coated Surface by Finite Element Analysis

Lee¹,

Park²

2013

Journal of the Korean Society of Tribologists and Lubrication E

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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 the coating thickness and elastic modulus have not been fully examined. In this study, a sliding contact problem between a small spherical hard particle and a DLC-coated steel surface is analyzed using a nonlinear finite element code, MARC. The maximum principal stress distributions and deformed surfaces are compared for different coating thicknesses and Young's modulus values. Plastically deformed surface shapes such as a groove and torus indicate that the most dominant wear mechanism for a DLC-coated surface is abrasive wear. Fatigue wear can also play a role in a case where the coating thickness is relatively large and the elastic modulus is high.

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A Study on Wear Mechanism in Diamond-like Carbon Coated Surface by Finite Element Analysis

Lee¹,

Park²

2013

Journal of the Korean Society of Tribologists and Lubrication E

View full text Add to dashboard Cite

show abstract

Indentation and Sliding Contact Analysis between a Rigid Ball and DLC-Coated Steel Surface: Influence of Supporting Layer Thickness

Lee¹,

Park

2014

Journal of the Korean Society of Tribologists and Lubrication E

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− Various heat-treated and surface coating methods are used to mitigate abrasion in sliding machine parts. The most cost effective of these methods involves hard coatings such as diamond-like carbon (DLC). DLC has various advantages, including a high level of hardness, low coefficient of friction, and low wear rate. In practice, a supporting layer is generally inserted between the DLC layer and the steel substrate to improve the load carrying capacity. In this study, an indentation and sliding contact problem involving a small, hard, spherical particle and a DLC-coated steel surface is modeled and analyzed using a nonlinear finite element code, MARC, to investigate the influence of the supporting layer thickness on the coating characteristics and the related coating failure mechanisms. The results show that the amount of plastic deformation and the maximum principal stress decrease with an increase in the supporting layer thickness. However, the probability of the high tensile stress within the coating layer causing a crack is greatly increased. Therefore, in the case of DLC coating with a supporting layer, fatigue wear can be another important cause of coating layer failure, together with the generally well-known abrasive wear.

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Friction Characteristics of DLC and WC/C

Cited by 2 publications

References 14 publications

A Study on Wear Mechanism in Diamond-like Carbon Coated Surface by Finite Element Analysis

A Study on Wear Mechanism in Diamond-like Carbon Coated Surface by Finite Element Analysis

Indentation and Sliding Contact Analysis between a Rigid Ball and DLC-Coated Steel Surface: Influence of Supporting Layer Thickness

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