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RESEARCH PAPERS

Tribological Studies on Oscillating Bronze Bearings Lubricated With Environmentally Adapted Lubricants (EALs)

[+] Author and Article Information
Jan Ukonsaari

Division of Machine Elements,  Luleå University of Technology, SE-971 87 Luleå, Sweden

Elisabet Kassfeldt

Division of Machine Elements,  Luleå University of Technology, SE-971 87 Luleå, Swedenelka@ltu.se

J. Tribol 128(1), 181-187 (Nov 09, 2004) (7 pages) doi:10.1115/1.2000267 History: Received February 15, 2004; Revised November 09, 2004

Different compositions of bronze materials are used for sliding bearings in various applications including those involving oscillatory motion and moderate temperatures. The compatibility of new environmentally adapted synthetic esters with different contacting surface materials helps ensure good tribological performance. The present work deals with tribological studies on oscillatory journal bearings manufactured using three different compositions of bronze materials lubricated with EALs under boundary lubricated conditions. Under certain operating conditions, alloying constituents from the bronze-bearing material dissolute into the synthetic ester lubricant, thereby leading to the formation of a copper enriched bearing surface layer. Tin-bronze with synthetic ester lubricant showed more stable friction values and roughly ten times better wear results than harder aluminium- and manganese-bronze as well as outperforming the mineral oil under the same conditions.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Journal bearing test-rig, viewed from above

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Figure 2

Friction curves from test with tin-bronze material

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Figure 3

Friction curves from test with aluminium-bronze material

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Figure 4

Friction curves from test with manganese-bronze material

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Figure 5

Weight loss for tin-bronze material comparing mineral oil and synthetic ester lubricants

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Figure 6

Weight loss for aluminium-bronze and manganese-bronze materials with synthetic ester lubrication

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Figure 7

Typical linear wear types from tests

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Figure 8

SEM surface image of tin-bronze bearing from (a) 15 MPa, (b) 30 MPa, and (c) 50 MPa for the synthetic ester lubricant

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Figure 9

SEM-EDS analysis of tin-bronze bearing surface from synthetic ester test at 15 MPa (test 2)

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Figure 10

SEM bronze surface images from (a) mineral oil and Sn-bronze (test 9), (b) synthetic ester and Al-bronze (test 14), and (c) Mn-bronze (test 18)

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