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Abstract
Low-load slow-speed sliding friction tests were conducted on a MoS2/graphite (90/10) bonded solid film lubricant in controlled-humidity environments. The average steady-state coefficient of friction increased from 0.23 to 0.28 as relative humidity (RH) was raised from 10 percent to 50 percent, and it increased to 0.6 when RH reached 90 percent.
At RH ≥80 percent, friction response was strongly influenced by chemically reactive metals used for slider and lubricant substrate. Thus, friction with carbon steel sliders was significantly lower than with stainless steel sliders, although corrosion of the former caused rapid destruction of the lubricant film. Also, continued sliding by stainless steel on lubricant applied to phosphor-bronze eventually resulted in a significant friction decrease and simultaneous formation of a dark red-brown film in the wear track. The proposed explanation for these effects is based on oxidation of MoS2 at the sliding interface and reaction of the oxidation products with slider and substrate metals.
Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference held in Pittsburgh, Pennsylvania, October 5–7, 1971
Notes
Presented as an American Society of Lubrication Engineers paper at the ASME/ASLE Lubrication Conference held in Pittsburgh, Pennsylvania, October 5–7, 1971
