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research-article

SEIZURE IMPROVED LEAD-FREE ELECTROPLATED BEARING OVERLAY SYSTEM FOR HEAVY DUTY TRUCK AND OFF-HIGHWAY APPLICATIONS

[+] Author and Article Information
Kevin Jupe

MAHLE Engine Systems, Rugby, UK
kevin.jupe@gb.mahle.com

Roger Gorges

MAHLE Engine Systems, Rugby, UK
roger.gorges@gb.mahle.com

Anil Rathod

MAHLE Engine Systems, Rugby, UK
anil.rathod@gb.mahle.com

John Carey

MAHLE Engine Systems, Rugby, UK
john.carey@gb.mahle.com

John Stearns

MAHLE Engine Components, Farmington Hills, MI, USA
john.stearns@us.mahle.com

1Corresponding author.

ASME doi:10.1115/1.4040292 History: Received May 10, 2018; Revised May 10, 2018

Abstract

The move to lead-free bearing materials is well known and upcoming legislation, such as the Restriction of Hazardous Substances (RoHS), is increasing the drive to extend this trend towards heavy duty diesel truck and off-highway applications. During the development of lead-free systems, new electroplated overlays and bronze-based substrates have been developed by various suppliers, but little attention has been given to the interlayer or diffusion barrier between the overlay and substrate materials. This interlayer is particularly necessary for tin-based solutions as it prevents the rapid diffusion of overlay species into the bronze substrate. The present development focuses on improving this often overlooked element in the system and provides a further robustness that could even be adapted to lead-based systems where increased performance is required. The incorporation of hexagonal boron nitride as a solid lubricant in the nickel interlayer changes dramatically the interlayer properties and provides more typical bearing-like behavior for seizure resistance scuff performance compared to nickel alone. The paper details findings of respective rig tests as well as an actual engine test supporting the change in material characteristics and the associated improvement in seizure resistance.

Copyright (c) 2018 by ASME
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