Tribological behavior of plasma spray coatings for marine diesel engine piston ring and cylinder liner |
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Authors: | Jong-Hyun Hwang Myoung-Seoup Han Dae-Young Kim Joong-Geun Youn |
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Affiliation: | (1) Materials Research Department, Hyundai Industrial Research Institute, Hyundai Heavy Industries Co. Ltd., 1 Cheonha-dong, Dong-gu, 682-792 Ulsan, South Korea |
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Abstract: | High-temperature wear characteristics between plasma spray coated piston rings and cylinder liners were investigated to find
the optimum combination of coating materials using the disc-on-plate reciprocating wear test in dry conditions. The disc and
plate represented the piston ring and the cylinder liner, respectively. Coating materials studied were Cr2O3-NiCr, Cr2O3-NiCr-Mo, and Cr3C2-NiCr-Mo. Plasma spray conditions for the coating materials were established adjusting stand-off distance to obtain a coating
with a porosity content of ∼5%. It was found that a dissimilar coating combination of Cr2O3-NiCr-Mo and Cr3C2-NiCr-Mo provided the best antiwear performance. The addition of molybdenum was found to be beneficial to improve the wear
resistance of the coating. Hardness differences between mating surfaces were also important factors in determining the wear
characteristics, so that it should be controlled below 300 in Vickers hardness under dry conditions. Adhesive wear accompanying
with metal transfer was a dominant wear mechanism for dry conditions. |
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Keywords: | abrasive adhesive ASTM G133 CV cast iron gray cast iron plasma spray coating solid lubricant |
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