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Abstract
The dynamics of formation and loss of the boundary films formed during the lubricated sliding of steel surfaces were investigated over a range of temperature and applied load. Tests were performed on a cylinder-on-disk machine using a phosphazene lubricant (X-IP), a polyphenyl ether, and mineral oil with and without addition of zinc. dialkyldithiophosphate (ZDP). Among these lubricants, X-IP was found to have the best high-temperature, high-load performance. The thickness and refractive index of the boundary films were monitored in situ with an ellipsonneler, and the composition of the, films was analyzed by X-ray photoelectron spectroscopy (XPS). The performance of the lubricants was found to be closely associated with boundary film-forming ability. In order to achieve high load-carrying capacity, a boundary film must be formed. The films formed in X-IP glow more slowly them those in ZDP-containing mineral, oil, but they remain thick even at high load and high temperature (250°C). These films are durable, and effective in reducing friction and preventing scuffing. The film formed with X-IP consists of a mixture of compounds containing Fe, O, C, F, P, and N. Among the compounds formed, some form of iron fluoride appears to be most important in determining the performance of the film.
Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Lahaina, Hawaii, October 16–20, 1994
Notes
Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Lahaina, Hawaii, October 16–20, 1994
