Abstract
Wear data for molybdenum lubricated with various metallic sulfides have been analyzed. It is found that wear life in the Falex Lubricant Tester depends greatly upon chemical reactions, which apparently form MoS2 in situ. With the possible exception of WS2, none of the metal sulfides except MoS2 are lubricants per se. Water solubility as an index of reactivity shows that compounds exhibiting pronounced water solubility function as more effective lubricants for molybdenum than less soluble compounds. There is also some evidence that wear life of alloy pins in the Falex wear test correlate with performance characteristics of ball bearings in high-speed bearing tests for several different alloy retainer materials.
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