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Effect of discontinuous hard under-coating on the life of solid film lubricant under extreme contact pressure

Authors
Journal
Tribology International
0301-679X
Publisher
Elsevier
Publication Date
Volume
30
Issue
6
Identifiers
DOI: 10.1016/s0301-679x(97)00006-6
Keywords
  • Solid Lubrication
  • Contact Pressure
  • Wear

Abstract

Abstract Wear life of bonded molybdenum disulfide film lubricant applied on discrete sections of chromium electroplated to an aluminum alloy substrate under extreme contact pressure was investigated. Block-on-ring tests with ridge-shaped, hardened stainless steel blocks and lubricant coated rings were carried out in a nitrogen atmosphere for several kinds of ring materials including this under-coating. All tests except those for the discontinuous chromium under-coating indicated large or unstable friction soon after the tests started. Discontinuous chromium coating demonstrated a stable friction coefficient of around 0.05 for a long time and the lubricant film remained intact after the test. This is because discontinuous chromium coating on aluminum substrate deformed along the shape of the ridged-block and contact pressure was decreased to several hundred MPa.

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