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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Bibliographic Details
Published in:RSC advances 2014, Vol.4 (41), p.21238-21245
Main Authors: Ratoi, M., Niste, V. B., Zekonyte, J.
Format: Article
Language:English
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Summary: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.
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA01795A