The Indirect Tribological Role of Carbon Nanotubes Stimulating Zinc Dithiophosphate Anti-Wear Film Formation

Jarosław Kałużny; Andrzej Kulczycki; Wojciech Dzięgielewski; Adam Piasecki; Bartosz Gapiński; Michał Mendak; Tomasz Runka; Damian Łukawski; Oleksandr Stepanenko; Jerzy Merkisz; Krzysztof Kempa

doi:10.3390/nano10071330

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Title

The Indirect Tribological Role of Carbon Nanotubes Stimulating Zinc Dithiophosphate Anti-Wear Film Formation

Authors

Jarosław Kałużny (WILiT) ^{[ 1 ][ 2.7 ][ P ]}
Andrzej Kulczycki
Wojciech Dzięgielewski
Adam Piasecki (WIMiFT) ^{[ 2 ][ 2.8 ][ P ]}
Bartosz Gapiński (WIM) ^{[ 3 ][ 2.9 ][ P ]}
Michał Mendak (WIM) ^{[ 3 ][ 2.9 ][ P ]}
Tomasz Runka (WIMiFT) ^{[ 4 ][ 2.8 ][ P ]}
Damian Łukawski (WIMiFT) ^{[ 5 ][ 2.8 ][ P ]}
Oleksandr Stepanenko (WILiT) ^{[ 1 ][ 2.7 ][ D ]}
Jerzy Merkisz (WILiT) ^{[ 1 ][ 2.7 ][ P ]}
Krzysztof Kempa (WILiT) ^{[ 1 ][ 2.7 ][ P ]}

^{[ 1 ]} Instytut Silników Spalinowych i Napędów, Wydział Inżynierii Lądowej i Transportu, Politechnika Poznańska | ^{[ 2 ]} Instytut Inżynierii Materiałowej, Wydział Inżynierii Materiałowej i Fizyki Technicznej, Politechnika Poznańska | ^{[ 3 ]} Instytut Technologii Mechanicznej, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | ^{[ 4 ]} Instytut Badań Materiałowych i Inżynierii Kwantowej, Wydział Inżynierii Materiałowej i Fizyki Technicznej, Politechnika Poznańska | ^{[ 5 ]} Instytut Fizyki, Wydział Inżynierii Materiałowej i Fizyki Technicznej, Politechnika Poznańska | ^{[ P ]} employee | ^{[ D ]} phd student

Scientific discipline (Law 2.0)

[2.7] Civil engineering and transport
[2.8] Materials engineering
[2.9] Mechanical engineering

Year of publication

2020

Published in

Nanomaterials

Journal year: 2020 | Journal volume: vol. 10 | Journal number: iss. 7

Article type

scientific article

Publication language

english

Keywords

EN

carbon nanotubes
anti-wear
tribology

Abstract

EN Experimental studies reveal that the simultaneous addition of zinc dialkyl dithiophosphates (ZDDPs) and multi-wall carbon nanotubes (MWCNTs) to a poly-alpha-olefin base oil strongly reduces wear. In this paper, it is shown that MWCNTs promote the formation of an anti-wear (AW) layer on the metal surface that is much thicker than what ZDDPs can create as a sole additive. More importantly, the nanotubes’ action is indirect, i.e., MWCNTs neither mechanically nor structurally strengthen the AW film. A new mechanism for this effect is also proposed, which is supported by detailed tribometer results, friction track 3D-topography measurements, electron diffraction spectroscopy (EDS), and Raman spectroscopy. In this mechanism, MWCNTs mediate the transfer of both thermal and electric energy released on the metal surface in the friction process. As a result, this energy penetrates more deeply into the oil volume, thus extending the spatial range of tribochemical reactions involving ZDDPs.

Date of online publication

08.07.2020

Pages (from - to)

1330-1 - 1330-13

DOI

10.3390/nano10071330

URL

https://www.mdpi.com/2079-4991/10/7/1330

Comments

Article Number: 1330

License type

CC BY (attribution alone)