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Optical and other properties changes of M-50 bearing steel surfaces for different lubricants and additives prior to scuffingAn ester lubricant base oil containing one or more standard additives to protect against wear, corrosion, and oxidation was used in an experimental ball/plate elastohydrodynamic contact under load and speed conditions such as to induce scuffing failure in short times. Both the ball and the plate were of identically treated M-50 steel. After various periods of operating time the wear track on the plate was examined with an interference microscope of plus or minus 30 A depth resolution and sometimes also with a scanning ellipsometer and an Auger spectrometer. The optically deduced surface profiles varied with wavelength, indicating the presence of surface coatings, which were confirmed by the other instruments. As scuffing was approached, a thin (approximately A) oxide layer and a carbide layer formed in the wear track in particular when tricresylphosphate antiwear additive was present in the lubricant. The rates of the formation of these layers and their reactivity toward dilute alcoholic HCl depended strongly on the lubricant and additives. Based on these results suggestions for improved formulations and a test method for bearing reliability could be proposed.
Document ID
19860035697
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lauer, J. L.
(Rensselaer Polytechnic Inst. Troy, NY, United States)
Marxer, N.
(Rensselaer Polytechnic Institute, Troy, NY, United States)
Jones, W. R., Jr.
(NASA lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1986
Publication Information
Publication: ASLE Transactions
Volume: 29
Subject Category
Nonmetallic Materials
Accession Number
86A20435
Funding Number(s)
CONTRACT_GRANT: NAG3-222
CONTRACT_GRANT: DAAG24-83-K-0058
CONTRACT_GRANT: AF-AFOSR-81-0005
Distribution Limits
Public
Copyright
Other

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