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Self-lubricating Al-WS2 composites for efficient and greener tribological parts

Self-lubricating Al-WS2 composites for efficient and greener tribological parts
Self-lubricating Al-WS2 composites for efficient and greener tribological parts
Due to their mechanical and physical properties, aluminium alloys possess wide potential in the automotive industry, particularly in hot reciprocating applications such as pistons for diesel and petrol engines. WS2 particle-reinforced composites could bring further improvements by reducing friction and wear between moving parts. Reducing friction improves efficiency by lowering energy/fuel use, ultimately leading to lower greenhouse gas emissions, while antiwear properties can prolong component life. This study compares for the first time the tribological performance of powder metallurgy-consolidated Al composites reinforced with either IF- or 2H-WS2 particles, so as to elucidate their mechanism of action in test conditions similar to those encountered in engine applications.
The composites were tested in lubricated reciprocating contacts against AISI52100 steel balls and the impact of WS2 could be seen at both 25 and 100ºC. The reduced friction and wear at ambient temperature is due to the predominantly physical mechanism of action of WS2, while the best antiwear performance is measured at elevated (standard operating engine) temperatures that promote the chemical reaction of WS2 with the aluminium matrix. The investigation focused on studying the wear tracks/scars and the tribofilms generated on the composite and ball with optical profilometry, SEM, XPS and Auger spectroscopy.
self-lubricating composites, AL-WS2, tribology
2045-2322
Niste, Vlad Bogdan
346e8f45-287d-4e40-b39c-f268521f6d3d
Ratoi, Monica
cfeffe10-31ca-4630-8399-232c4bc2beff
Tanaka, Hiroyoshi
3590bace-54f9-4647-b10f-2852c25f9f36
Xu, Fang
17d83cd9-99b6-4e0c-859e-01b03ec5ff1f
Zhu, Yanqiu
b37b025c-7f30-4e52-81a4-de9b8ffc08d6
Sugimura, Joichi
fd2a9a25-1b09-44e4-b8ca-d5cb66ea67db
Niste, Vlad Bogdan
346e8f45-287d-4e40-b39c-f268521f6d3d
Ratoi, Monica
cfeffe10-31ca-4630-8399-232c4bc2beff
Tanaka, Hiroyoshi
3590bace-54f9-4647-b10f-2852c25f9f36
Xu, Fang
17d83cd9-99b6-4e0c-859e-01b03ec5ff1f
Zhu, Yanqiu
b37b025c-7f30-4e52-81a4-de9b8ffc08d6
Sugimura, Joichi
fd2a9a25-1b09-44e4-b8ca-d5cb66ea67db

Niste, Vlad Bogdan, Ratoi, Monica, Tanaka, Hiroyoshi, Xu, Fang, Zhu, Yanqiu and Sugimura, Joichi (2017) Self-lubricating Al-WS2 composites for efficient and greener tribological parts. Scientific Reports, 7, [14665]. (doi:10.1038/s41598-017-15297-6).

Record type: Article

Abstract

Due to their mechanical and physical properties, aluminium alloys possess wide potential in the automotive industry, particularly in hot reciprocating applications such as pistons for diesel and petrol engines. WS2 particle-reinforced composites could bring further improvements by reducing friction and wear between moving parts. Reducing friction improves efficiency by lowering energy/fuel use, ultimately leading to lower greenhouse gas emissions, while antiwear properties can prolong component life. This study compares for the first time the tribological performance of powder metallurgy-consolidated Al composites reinforced with either IF- or 2H-WS2 particles, so as to elucidate their mechanism of action in test conditions similar to those encountered in engine applications.
The composites were tested in lubricated reciprocating contacts against AISI52100 steel balls and the impact of WS2 could be seen at both 25 and 100ºC. The reduced friction and wear at ambient temperature is due to the predominantly physical mechanism of action of WS2, while the best antiwear performance is measured at elevated (standard operating engine) temperatures that promote the chemical reaction of WS2 with the aluminium matrix. The investigation focused on studying the wear tracks/scars and the tribofilms generated on the composite and ball with optical profilometry, SEM, XPS and Auger spectroscopy.

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More information

Accepted/In Press date: 19 October 2017
e-pub ahead of print date: 7 November 2017
Published date: 7 November 2017
Keywords: self-lubricating composites, AL-WS2, tribology

Identifiers

Local EPrints ID: 415331
URI: http://eprints.soton.ac.uk/id/eprint/415331
ISSN: 2045-2322
PURE UUID: da1c73a0-3a31-4cc0-8f24-24c62fc537ae

Catalogue record

Date deposited: 07 Nov 2017 17:30
Last modified: 07 Oct 2020 04:31

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