TY - CONF A1 - Wolter, Christian A1 - Österle, Werner A1 - Gradt, Thomas T1 - Metal sulphides as friction stabilisers under variable humidity N2 - 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. T2 - 57. GfT Tribologie-Fachtagung CY - Göttingen, Germany DA - 26.09.2016 KW - Metal sulphides KW - Humidity KW - Tribology KW - Friction PY - 2016 AN - OPUS4-38254 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wolter, Christian A1 - Gradt, Thomas T1 - A study on metal sulphides in tribofilms of modelled brake wear debris under variable humidity N2 - 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. T2 - Europe's braking technology Conference & Exhibition (EuroBrake 2017) CY - Dresden, Germany DA - 02.05.2017 KW - Metal sulphides KW - Pin-on-disc KW - Third body KW - Humidity KW - Powders mixtures PY - 2017 AN - OPUS4-40154 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -