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  • Dietrich, Paul (1) (entfernen)

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  • Ball milling (1)
  • Transmission electron microscopy (1)
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  • 6 Materialschutz und Oberflächentechnik (1) (entfernen)

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Comprehensive characterization of ball-milled powders simulating a tribofilm system (2016)
Häusler, Ines ; Dörfel, Ilona ; Peplinski, Burkhard ; Dietrich, Paul ; Unger, Wolfgang ; Österle, Werner
A model system was used to simulate the properties of tribofilms which form during automotive braking. The model system was prepared by ball milling of a blend of 70 vol.% iron oxides, 15 vol.% molybdenum disulfide and 15 vol.% graphite. The resulting mixture was characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and various transmission electron microscopic (TEM) methods, including energy dispersive X-ray spectroscopy (EDXS), high resolution investigations (HRTEM) with corresponding simulation of the HRTEM images, diffraction methods such as scanning nano-beam electron diffraction (SNBED) and selected area electron diffraction (SAED). It could be shown that the ball milling caused a reduction of the grain size of the initial components to the nanometer range. Sometimes even amorphization or partial break-down of the crystal structure was observed for MoS2 and graphite. Moreover, chemical reactions lead to a formation of surface coverings of the nanoparticles by amorphous material, molybdenum oxides, and iron sulfates as derived from XPS.
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