Abstract
A mineral oil and a lithium soap mineral oil grease containing molybdenum disulfide, calcium hydroxide and zinc pyrophosphate, as solid lubricant additives were tested under boundary conditions in the Shell Four Ball Lubricant Testing machine, the LFW-1 testing machine and in a modified Reichert Wear Balance. Investigation of the wear tracks by scanning electron microscopy and microprobe analysis showed that these solids, added to oils or greases, form a lubricating film on the metal surfaces during frictional contact. By quantitative analysis the effect of running time and pressure on the film thickness of molybdenum disulfide was studied. Under extreme friction conditions, molybdenum disulfide reacts chemically with iron forming FeS; the resulting Mo diffuses into the steel surface.
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