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Technical Paper

A Study of Three Layer Copper-Lead Bearings Without Nickel Barrier

1997-02-24
970214
The advent of high-performance, compact, and lightweight engines in recent years brings forth a tendency to increase the load for engine bearings and demands on producing even higher levels of durability and reliability in bearing products against fatigue, seizure, wear, and corrosion. Based on the perspective of extending the bearing life, the authors have studied the problems that are encountered with the current three layer copper-lead alloy bearings after their overlay has worn out. Then, we studied the issues of lowered seizure resistance that results from the exposure of the nickel barrier, and of deficient corrosion resistance that results from the exposure of the bearing alloy. In order to improve upon these areas, we focused on diffusion phenomenon of overlay elements without the nickel barrier and also studied the feasibility of creating engine bearings whose alloy composition has been partially modified.
Technical Paper

Diffusion Behavior of Overlay for Three Layers Engine Bearings

1989-02-01
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.
Technical Paper

Development of New Aluminum-Zinc-Silicon Bearings for Heavy Load Applications in Uprated Engines

1990-02-01
900124
The recent trend toward the compact and light-weight construction of diesel engines with high power output has been imposing higher requirements of fatigue strength and antiseizure characteristics on bearings. In order to meet these requirements, the authors developed a new bearing alloy of higher fatigue strength for use in heavy load engines, through the analysis of the Al-Zn-Si alloy which has high corrosion resistance. Experimental results of this new alloy to study its physical properties and bearing performances indicate that it can be applied to bearings in diesel engines which operate in harsh conditions.
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