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Role of Ag added together with Sn to Cu-Sn-Ag alloy bearing for heavy duty diesel engine

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A higher seizure resistant Cu-5Sn-IAg alloy bearing was previously developed for heavy duty diesel engines. This study, therefore, was conducted to clarify the anti-seizure mechanism of the bearing by analyzing the sliding surfisce, using EPMA, AES and XRD. Excess amounts of Sn and Ag supersaturated in the alloy were found to segregate the surface and form an enriched thin 5Sn- 1Ag layer of 0.1 μ m in thickness during the sliding test at 160℃. Just above the 5Sn- 1Ag layer, surface contamination, mainly of carbon, and reaction products with engine oil were also found. They, however, were considered not to contribute the anti-seizure property of the alloy. On the other hand, a sputtered 5Sn-1Ag film of 0.1μm on Cu-5Sn alloy was found to show low frictional coefficient of 0.15-0.20 and good anti-seizure performance under dry condition at higher temperature of 180℃, since sliding surface layer was consisted of very thin soft 5Sn-1Ag (16HV0.2 at R.T.) layer on the harder Cu-5Sn alloy (120HV0.2). It was, therefore, concluded that anti-seizure performance of Cu-5Sn-1Ag alloy bearing was caused by the formation of enriched thin and soft 5Sn-1Ag layer on the harder bearing alloy (125HV0.2) surface.

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