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http://dx.doi.org/10.5228/KSPP.2009.18.6.465

Effect of Coating Layer Hardness on Frictional Characteristics of Diesel Engine Piston Ring  

Jang, J.H. (부산대학교 기계공학부/정밀정형 및 금형가공 연구소)
Joo, B.D. (부산대학교 기계공학부/정밀정형 및 금형가공 연구소)
Lee, H.J. (부산대학교 기계공학부/정밀정형 및 금형가공 연구소)
Kim, E.H. (부산대학교 기계공학부/정밀정형 및 금형가공 연구소)
Moon, Y.H. (부산대학교)
Publication Information
Transactions of Materials Processing / v.18, no.6, 2009 , pp. 465-470 More about this Journal
Abstract
The frictional behaviors of Cermets/Cr-Ceramics and Cu-Al coatings of piston ring were investigated. Friction tests were carried out by pin-on-disk test and materials properties of coating layer were analyzed by nano indentation tester. The effect of surface roughness of cylinder liner on the friction coefficient was analyzed. This study provided tribological data of hard and soft piston ring coatings against cylinder liner. The surface roughness does exert an influence on the average friction coefficient, with smoother surfaces generally yielding lower friction coefficients. In case of hard-coating, the scratch depth, width and pile-up height had close relationship with hardness. So the scratch width, depth and pile-up height increases with decreasing friction coefficient. But in case of soft-coating, the friction coefficients are strongly dependent on the morphological characteristics such as, scratch depth, width, pile-up height and elastic modulus.
Keywords
Friction Coefficient; Piston Ring; Coating Layer; Nano-indentation; Nano-scratch; Pin-on-Disk(POD);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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