Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
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Werner Österle
Abstract
The unique nanostructure formed during severe as well as moderate braking on the surface of brake discs was investigated by conventional and analytical Transmission Electron Microscopy. In both cases nanocrystalline magnetite mixed with carbon nanoinclusions and minor amounts of other pad constituents were identified. On the basis of these observations the friction performance of a single micro-contact was simulated with the method of Movable Cellular Automata. Inspite of a simplified nanostructure which was examined in two dimensions only, the calculated mean coefficient of friction fitted well to the value usually demanded for automotive braking. Furthermore, the model predicts that oxide films without soft nanoinclusions are not capable of providing smooth velocity accommodation at the pad–disc interface and thus lead to unstable friction behaviour.
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Articles in the same Issue
- Contents
- Contents
- Editorial
- Prof. Dr. Monika Feller-Kniepmeier 80th birthday
- Basic
- Model calculation of inoculation and experimental verification in two alloy-systems
- Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
- Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
- Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
- X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
- Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
- Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
- On the formation of λ-MnAl4
- Applied
- Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
- Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
- Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
- Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
- Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
- On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
- Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
- Creep strength of a binary Al62Ti38 alloy
- Bowing out of a dislocation from wall of persistent slip bands (PSB)
- Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
- The joint properties of dissimilar aluminum plates joined by friction stir welding
- Notification
- DGM News
Articles in the same Issue
- Contents
- Contents
- Editorial
- Prof. Dr. Monika Feller-Kniepmeier 80th birthday
- Basic
- Model calculation of inoculation and experimental verification in two alloy-systems
- Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
- Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
- Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
- X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
- Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
- Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
- On the formation of λ-MnAl4
- Applied
- Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
- Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
- Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
- Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
- Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
- On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
- Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
- Creep strength of a binary Al62Ti38 alloy
- Bowing out of a dislocation from wall of persistent slip bands (PSB)
- Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
- The joint properties of dissimilar aluminum plates joined by friction stir welding
- Notification
- DGM News
