In-Situ Formation of MoS2 and WS2 Tribofilms by the Synergy Between Transition Metal Oxide Nanoparticles and Sulphur-Containing Oil Additives

This works investigates the in-situ formation of MoS 2 and WS 2 tribofilms by the synergy between transition metal oxide nanoparticles and conventional sulphur-containing anti-wear and extreme pressure additives. The formation of these low friction tribofilms can be obtained under reciprocating slid...

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Veröffentlicht in:Tribology letters 2020-03, Vol.68 (1), Article 41
Hauptverfasser: Rodríguez Ripoll, Manel, Tomala, Agnieszka Maria, Pirker, Luka, Remškar, Maja
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creator Rodríguez Ripoll, Manel
Tomala, Agnieszka Maria
Pirker, Luka
Remškar, Maja
description This works investigates the in-situ formation of MoS 2 and WS 2 tribofilms by the synergy between transition metal oxide nanoparticles and conventional sulphur-containing anti-wear and extreme pressure additives. The formation of these low friction tribofilms can be obtained under reciprocating sliding contact and under extreme pressure conditions, as evidenced using X-ray photoelectron spectroscopy. Under reciprocating sliding conditions, the synergy between transition metal oxide nanoparticles and the ZDDP leads to coefficients of friction around 0.06 before they rise as consequence of oxidation. The synergy is more outstanding in extreme pressure conditions, particularly for MoO 3 nanotubes combined with extreme pressure additive. This combination outperforms base oil mixtures containing EP additive or MoS 2 nanotubes. While MoS 2 nanotubes build superb extreme pressure tribofilms containing iron and molybdenum oxides and sulphides, MoO 3 nanotubes are able to build similar tribofilms that can continuously re-sulphurize in the presence of the extreme pressure additive. Despite having a similar chemistry, MoO 3 nanotubes are observed to sulphurize more easily when compared to WO 3 nanoparticles. The work highlights the tribological potential of these nanoparticles otherwise typically used as precursors for the synthesis of transition metal dichalcogenide nanoparticles.
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subjects Chemistry and Materials Science
Coefficient of friction
Contact pressure
Corrosion and Coatings
Materials Science
Metal oxides
Molybdenum disulfide
Molybdenum oxides
Molybdenum trioxide
Nanoparticles
Nanotechnology
Nanotubes
Oil additives
Organic chemistry
Original Paper
Oxidation
Photoelectrons
Physical Chemistry
Sliding contact
Sulfur
Surfaces and Interfaces
Theoretical and Applied Mechanics
Thin Films
Transition metal compounds
Transition metal oxides
Tribology
Tungsten disulfide
title In-Situ Formation of MoS2 and WS2 Tribofilms by the Synergy Between Transition Metal Oxide Nanoparticles and Sulphur-Containing Oil Additives
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