Wear Studies of MIL-L-23699 Aircraft Turbine Engine. Synthetic Base Lubricating Oils - I. The Development of a Procedure and Initial Findings
1973
Limpert, John C.
A new procedure has been developed to more easily distinguish differences in wear characteristics attributable to base-stock composition or additives and contaminants in MIL-L-23699 aircraft turbine engine synthetic base lubricating oils. The procedure employs a linear ball-on-flat principle and is capable of giving boundary lubrication wear information in terms of the work required to remove material from rubbing surfaces in the elastic range of bulk bearing material. The procedure is particularly useful in illuminating the initial stage of the wear process. The procedure is more sensitive in the low- wear region than a four-ball wear procedure used in steam-turbine oil specifications. It is capable of showing the detrimental effect on wear of water in gas-turbine lubricating oils. The MIL-L-23699 oils exhibit a linear relationship between the removal of bearing surface material (wear) and the work required to effect this removal. This relationship is altered in the presence of at least one sea-water rust inhibitor. The MIL-L-23699 qualified oils vary widely in antiwear performance.
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