Tungsten dichalcogenide lubricant nanoadditives for demanding applications
| Autor: | Vlad Bogdan Niste, Monica Ratoi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Metallurgy chemistry.chemical_element Nanoparticle 02 engineering and technology Substrate (electronics) Tungsten Tribology 021001 nanoscience & nanotechnology Boundary friction Layered structure Shear (sheet metal) 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials Materials Chemistry General Materials Science Composite material Lubricant 0210 nano-technology |
| Zdroj: | Materials Today Communications. 8:1-11 |
| ISSN: | 2352-4928 |
| DOI: | 10.1016/j.mtcomm.2016.04.015 |
| Popis: | Tungsten dichalcogenides such as WS2 and WSe2 have remarkable friction reducing properties in tribological applications due to their layered structure which exfoliates easily under shear. 2H-WS2 nanoparticles (NPs) have recently been shown to possess excellent antiwear properties in high temperature applications due to their ability to react with the steel substrate and generate a chemical tribofilm with very good mechanical properties. Moreover, 2H-WS2 sheets can adhere to the chemical tribofilm and thus also reduce boundary friction. This study investigated the tribological properties of tungsten dichalcogenide NPs with different morphologies (IF and 2H) in high temperature, high pressure test conditions, the aim being to identify their mechanism of action and the differences in their performance. Tribological tests and analysis of tribofilms on the wear tracks revealed that the three additives show a similar mechanism of action based on their chemical reaction with the wear track. However, 2H-WS2 NPs have superior friction reducing and antiwear properties due to their increased reactivity, resulting in a tribofilm that grows faster, thicker, more uniform and richer in tungsten compounds. |
| Databáze: | OpenAIRE |
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