Ingenieurwissenschaften und zugeordnete Tätigkeiten
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- 2017 (2) (entfernen)
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- Englisch (2)
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- Artificial third body (1)
- Brake friction materials (1)
- Humidity (1)
- Metal sulphides (1)
- Metal sulphies (1)
- Pin-on-disc (1)
- Powders mixtures (1)
- Third body (1)
Eingeladener Vortrag
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A bottom-up approach to study metal sulphides in brake friction materials at higher temperatures
(2017)
The impact of metal sulphides in brake friction materials on the friction behaviour of disc brakes was studied at two different temperatures and in two different atmospheres using a pin-on-disc device with powder supply. Powder mixtures were prepared by using a bottom-up approach, where magnetite is the main component, in which different metal sulphides are mixed in. At 400 °C, the resulting coefficients of friction are higher in air than in nitrogen atmosphere, which can be attributed to the generation of metal oxides and were confirmed by doing thermal analysis.
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.