WS sub(2) nanoparticles - potential replacement for ZDDP and friction modifier additives

In high-pressure, high-temperature sliding contacts, WS sub(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 sub(2) tribofilms are compared w...

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Bibliographic Details
Published inRSC advances Vol. 4; no. 41; pp. 21238 - 21245
Main Authors Ratoi, M, Niste, V B, Zekonyte, J
Format Journal Article
LanguageEnglish
Published 01.05.2014
Subjects
Boundaries
Friction
Hardness
Modulus of elasticity
Nanoparticles
Nanostructure
Tribology
Zinc dialkyldithiophosphates
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Summary:In high-pressure, high-temperature sliding contacts, WS sub(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 sub(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 sub(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 sub(2) surpassed that of ZDDP + OFM. The striking reduction of boundary friction is credited to the layered structure of the WS sub(2) tribofilm, with exfoliated/squashed WS sub(2) nanoparticles that fill the gaps and cover the reacted tribofilm. In view of these results, WS sub(2) proves to be a suitable candidate for the replacement of problematic lubricant additives currently in use.
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ISSN:2046-2069
DOI:10.1039/c4ra01795a