Diffusion Behavior of Overlay for Three Layers Engine Bearings 890555
The diffusion phenomena of tin and indium which are contained in the lead-base overlay of 3-layer copper-lead alloy bearings were studied. Easier diffusion of tin compared with indium decreases the corrosion resistance of the overlay, and the tin reacts with the underlayer to form brittle Ni-Sn or Cu-Sn intermetallic compound, resulting in weak bonding strength.
Addition of copper into Pb-In overlay markedly restrains the diffusion of indium and therefore stabilizes the characteristics of corrosion resistance, bonding strength and mechanical properties for a long period. Cavitation tests, seizure tests and bearing fatigue tests were conducted on Pb-In-Cu overlay to study the feasibility of its application to actual engine bearings.
Citation: Sakamoto, M., Wada, M., and Ogita, Y., "Diffusion Behavior of Overlay for Three Layers Engine Bearings," SAE Technical Paper 890555, 1989, https://doi.org/10.4271/890555. Download Citation
