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Volume 12, March 2017, Pages 18-37
Self-lubricating tribological characterization of lead free Fe-Cu
based plain bearing material
Shuhaib
Mushtaq, M.F. Wani
Centre for Tribology, Department of Mechanical Engineering, National Institute of Technology Srinagar, 190006 India
Abstract
The negative impact of lead on environment and
thereby its reciprocity on the health of mankind, there is a growing
emphasis on resisting the usage of lead in bearings. Owing to this,
new bearing materials that provide comparable tribological
performance to that of lead containing alloys are being developed.
In this study, lead free Fe-Cu based powders with addition of
elements such as tin, molybdenum disulfide and Nano boron nitride
(BN) have been developed by powder metallurgy (PM) technique in
order to improve the tribological and mechanical properties. The
powder mixtures were compressed at a pressure of 500 MPa, and then
sintered in dry hydrogen atmosphere at 9000C for 50
minutes. The mechanical and tribological properties obtained due to
addition of the said elements is presented in this study. The
tribological behavior of the selected alloys is analyzed by
reciprocating-sliding tests under dry conditions. The morphology of
wear scars and the microstructure of the wear surfaces were
investigated. The material with 2.5 wt.% of Sn exhibited the highest
value of hardness, the material with 7.5 wt.% of Nano BN comparably
shows the low coefficient of friction and wear rate as compared with
5 wt.% of Nano BN.
Keywords
Self-lubricating bearing; Fe-Cu alloy; Powder metallurgy; Friction; Wear
Full Text
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