Comprehensive characterization of ball-milled powders simulating a tribofilm system
| Autor: | Ines Häusler, Paul Dietrich, Wolfgang E. S. Unger, Werner Österle, I. Dörfel, Burkhard Peplinski |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry.chemical_compound Crystallography 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Electron diffraction X-ray photoelectron spectroscopy Chemical engineering Mechanics of Materials General Materials Science Selected area diffraction 0210 nano-technology High-resolution transmission electron microscopy Molybdenum disulfide Ball mill Powder diffraction Electron backscatter diffraction |
| Zdroj: | Materials Characterization. 111:183-192 |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2015.11.024 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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