WS 2 nanoparticles – potential replacement for ZDDP and friction modifier additives
In high-pressure, high-temperature sliding contacts, WS 2 nanoadditives react with the metal substrate to generate 100+ nm chemical tribofilms with a layered structure and excellent tribological properties. The friction, wear and micromechanical properties of WS 2 tribofilms are compared with those...
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Veröffentlicht in: | RSC advances 2014, Vol.4 (41), p.21238-21245 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | In high-pressure, high-temperature sliding contacts, WS
2
nanoadditives react with the metal substrate to generate 100+ nm chemical tribofilms with a layered structure and excellent tribological properties. The friction, wear and micromechanical properties of WS
2
tribofilms are compared with those of tribofilms formed by the zinc dialkyldithiophosphate (ZDDP) antiwear additive and ZDDP-organic friction modifier (OFM) mixture. Nanoindentation measurements showed that WS
2
generates tribofilms with higher values of hardness and Young's modulus than ZDDP and ZDDP + OFM, which explains its excellent antiwear properties. The friction performance of WS
2
surpassed that of ZDDP + OFM. The striking reduction of boundary friction is credited to the layered structure of the WS
2
tribofilm, with exfoliated/squashed WS
2
nanoparticles that fill the gaps and cover the reacted tribofilm. In view of these results, WS
2
proves to be a suitable candidate for the replacement of problematic lubricant additives currently in use. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C4RA01795A |