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A study on metal sulphides in tribofilms of modelled brake wear debris under variable humidity
(2017)
Metal sulphides are needed in brake pad formulations in addition to graphite to compensate the influence of different environments. The sensitivity to humidity differs a lot for each single constituent. Only one component is not sufficient for stabilising the COF and it is also necessary to add more components than only one metal sulphide to graphite. Furthermore, a good mixing process inside the third body during braking is necessary to prevent formation of solid lubricant films which are detrimental for braking. Nevertheless, not every metal sulphide acts as a solid lubricant but most of them have the ability for stabilizing the friction coefficient.
To investigate the influence of metal sulphides in brake pads, powder mixtures with up to three components were tribologically stressed in a pin-on-disc device under different levels of relative humidity. The tests revealed that each metal sulphide causes significant differences in resulting coefficients of friction as well in their sensitivity to humidity, so that only one solid lubricant cannot stabilise the friction behaviour during braking in different environments.