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- Third body (4)
- Tribofilm (4)
- Friction (3)
- Movable cellular automata (3)
- Wear (2)
- 9-12% Cr-steels (1)
- Ball milling (1)
- Beschichtung (1)
- Brake dust (1)
- Brake pad formulation (1)
- Ceramic disc (1)
- Copper (1)
- Copper particles (1)
- Corrosion gases (1)
- Dry friction (1)
- FIB (1)
- Friction film (1)
- Friction layer (1)
- HIP-Simulation (1)
- Heat accumulation (1)
- High temperature corrosion (1)
- Hybrid composite (1)
- Hydrogen transport (1)
- Lattice (1)
- Local structural transformations (1)
- MCA-modelling (1)
- Metal sulphides (1)
- Mild steels (1)
- Modelling (1)
- Molecular dynamics (1)
- Nanoparticles (1)
- Nanostructure (1)
- Numerical simulation (1)
- Oxyfuel combustion (1)
- PMC-pad (1)
- Pad ingredients (1)
- Pin-on-disc test (1)
- Polymer matrix composite (1)
- Reibung (1)
- SEM (1)
- SM-pad (1)
- Silica nanoparticle (1)
- Silica nanoparticles (1)
- Size-distribution (1)
- Sliding simulation (1)
- Successive braking (1)
- Thermal localisation (1)
- Third body film (1)
- Verschleiß (1)
Tribofilms formed during dry sliding usually exhibit a nanocrystalline structure and complicated composition. In the present study, tribofilms consisting mainly of a solid lubricant, namely graphite nanoparticles, are considered. Systems providing such tribofilms are candidates for anti-friction applications. Since sliding action always leads to mixing of the materials at both sides of the tribological interface, it was of major interest to study the impact of different amounts of a hard constituent, SiC in the considered case, within the soft matrix systematically. Furthermore, the impact of normal pressure was considered. A mechanically mixed layer was observed for the whole range of normal pressures and SiC volume fractions. The calculated coefficient of friction decreased significantly with increasing thickness of this layer but was only marginally affected by SiC volume fraction, which is good news for anti-friction applications.
In order to obtain a better understanding of the role of tribofilms during automotive braking, their structures were investigated and the essential features identified.
Next, different ingredient combinations were studied by preparing some model materials with simpler compositions than real tribofilms. A test method was developed for verifying the tribological properties of the model materials and for comparison with results obtained with numerical sliding simulations of such structures. Prerequisites of good brake Performance properties were identified. Although the coefficient of friction could be varied in a wide ränge, smooth sliding conditions could only be achieved with values smaller than 0.4. Tests with artificial third body powders turned out to be useful as screening method for the selection of raw materials for brake pad formulations.