Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (37)
- Beitrag zu einem Sammelband (31)
- Beitrag zu einem Tagungsband (30)
- Vortrag (6)
- Buchkapitel (2)
- Forschungsbericht (2)
- Dissertation (1)
- Posterpräsentation (1)
Sprache
- Englisch (69)
- Deutsch (39)
- Mehrsprachig (2)
Referierte Publikation
- nein (110) (entfernen)
Schlagworte
- Tribofilm (6)
- Third body (5)
- Automotive braking (3)
- Friction (3)
- Movable cellular automata (3)
- Nanocharakterisierung (3)
- Reibung (3)
- Sliding simulation (3)
- TEM (3)
- Verschleiß (3)
Organisationseinheit der BAM
Eingeladener Vortrag
- nein (6)
The sliding behavior of an amorphous silica sample between two rigid surfaces is in the focus of the present paper. Molecular Dynamics using a classical Tersoff’s potential and a recently developed ReaxFF potential was applied for simulating sliding within a thin film corresponding to a tribofilm formed from silica nanoparticles. The simulations were performed at different temperatures corresponding to moderate and severe tribological stressing conditions. Simulations with both potentials revealed the need of considering different temperatures in order to obtain a sound interpretation of experimental findings. The results show the striking differences between the two potentials not only in terms of magnitude of the resistance stress (about one order of magnitude) but also in terms of friction mechanisms. The expected smooth sliding regime under high temperature conditions was predicted by both simulations, although with Tersoff’s potential smooth sliding was obtained only at the highest temperature. On the other hand, at room temperature Tersoff-style calculations demonstrate stick-slip behavior, which corresponds qualitatively with our experimental findings. Nevertheless, comparison with a macroscopic coefficient of friction is not possible because simulated resistance stresses do not depend on the applied normal pressure.
NM 105, Ti02 (P25) could not be ignited as dust layer and dispersed in air as dust/air-mixture as well. This dust is not dust explosible and the burning behaviour corresponds to Burning Class 1 (no Ignition). The results have shown that the tested sample is thus not combustible at all, because it is already oxidized completely.