In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils

A. Al Sheikh Omar; F. Motamen Salehi; M. Bai; B. J. Inkson; A. Morina

doi:10.1016/j.carbon.2023.118170

In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils

A. Al Sheikh Omar, F. Motamen Salehi, M. Bai, B. J. Inkson, A. Morina

Centre for Manufacturing and Materials

Research output: Contribution to journal › Article › peer-review

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46 Downloads (Pure)

Abstract

The study has evaluated the role of soot, surrogated by carbon black (CB) experimentally, in affecting the performance of engine oils. It is very well known that the existence of soot in oil produces abrasive wear on contact surfaces. Other mechanisms influence the oil performance such as additives adsorption on soot and oil degradation due to the interactions with soot. Recent research has suggested the existence of another wear mechanism related to soot particles, which remains poorly understood. This study investigates the effect of soot interactions in engine oil on its mechanical properties. Carbon black particles (CBPs) were used in the experiments to simulate real soot in the engine. The microstructure and crystal structure of CBPs compared to real soot were investigated using transmission electron microscopy (TEM) and X-ray diffraction (XRD). In situ compression of the single particle was conducted in a scanning electron microscope (SEM) to evaluate the mechanical properties of fresh and aged CBPs with different sizes. The results show that aged CBPs are significantly harder than fresh CBPs, indicating that ageing in oil modifies the turbostratic crystal structure of CBPs and alters its mechanical properties, potentially affecting tribological performance.

Original language	English
Article number	118170
Number of pages	10
Journal	Carbon
Volume	212
Early online date	2 Jun 2023
DOIs	https://doi.org/10.1016/j.carbon.2023.118170
Publication status	Published - 1 Aug 2023

Bibliographical note

Funder

The authors would like to thank Parker Hannifin Ltd and the EPSRC Centre for Doctoral Training for Integrated Tribology for providing the fund for this research. Grant No. EP/l01629X/1 . This work is supported by the Engineering and Physical Sciences Research Council (Grant number EP/R001766/1 ) as a part of ‘Friction: The Tribology Enigma’ ( www.friction.org.uk ), a collaborative Programme Grant between the Universities of Leeds and Sheffield.

Publisher Copyright:
© 2023

Keywords

Crystal structure
In situ SEM
Mechanical properties
Nanoindentation
Soot
Tribology

ASJC Scopus subject areas

General Chemistry
General Materials Science

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10.1016/j.carbon.2023.118170Licence: CC BY

PublishedFinal published version, 15.2 MBLicence: CC BY

Cite this

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title = "In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils",

abstract = "The study has evaluated the role of soot, surrogated by carbon black (CB) experimentally, in affecting the performance of engine oils. It is very well known that the existence of soot in oil produces abrasive wear on contact surfaces. Other mechanisms influence the oil performance such as additives adsorption on soot and oil degradation due to the interactions with soot. Recent research has suggested the existence of another wear mechanism related to soot particles, which remains poorly understood. This study investigates the effect of soot interactions in engine oil on its mechanical properties. Carbon black particles (CBPs) were used in the experiments to simulate real soot in the engine. The microstructure and crystal structure of CBPs compared to real soot were investigated using transmission electron microscopy (TEM) and X-ray diffraction (XRD). In situ compression of the single particle was conducted in a scanning electron microscope (SEM) to evaluate the mechanical properties of fresh and aged CBPs with different sizes. The results show that aged CBPs are significantly harder than fresh CBPs, indicating that ageing in oil modifies the turbostratic crystal structure of CBPs and alters its mechanical properties, potentially affecting tribological performance.",

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author = "{Al Sheikh Omar}, A. and Salehi, {F. Motamen} and M. Bai and Inkson, {B. J.} and A. Morina",

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AU - Salehi, F. Motamen

AU - Bai, M.

AU - Inkson, B. J.

AU - Morina, A.

PY - 2023/8/1

Y1 - 2023/8/1

N2 - The study has evaluated the role of soot, surrogated by carbon black (CB) experimentally, in affecting the performance of engine oils. It is very well known that the existence of soot in oil produces abrasive wear on contact surfaces. Other mechanisms influence the oil performance such as additives adsorption on soot and oil degradation due to the interactions with soot. Recent research has suggested the existence of another wear mechanism related to soot particles, which remains poorly understood. This study investigates the effect of soot interactions in engine oil on its mechanical properties. Carbon black particles (CBPs) were used in the experiments to simulate real soot in the engine. The microstructure and crystal structure of CBPs compared to real soot were investigated using transmission electron microscopy (TEM) and X-ray diffraction (XRD). In situ compression of the single particle was conducted in a scanning electron microscope (SEM) to evaluate the mechanical properties of fresh and aged CBPs with different sizes. The results show that aged CBPs are significantly harder than fresh CBPs, indicating that ageing in oil modifies the turbostratic crystal structure of CBPs and alters its mechanical properties, potentially affecting tribological performance.

AB - The study has evaluated the role of soot, surrogated by carbon black (CB) experimentally, in affecting the performance of engine oils. It is very well known that the existence of soot in oil produces abrasive wear on contact surfaces. Other mechanisms influence the oil performance such as additives adsorption on soot and oil degradation due to the interactions with soot. Recent research has suggested the existence of another wear mechanism related to soot particles, which remains poorly understood. This study investigates the effect of soot interactions in engine oil on its mechanical properties. Carbon black particles (CBPs) were used in the experiments to simulate real soot in the engine. The microstructure and crystal structure of CBPs compared to real soot were investigated using transmission electron microscopy (TEM) and X-ray diffraction (XRD). In situ compression of the single particle was conducted in a scanning electron microscope (SEM) to evaluate the mechanical properties of fresh and aged CBPs with different sizes. The results show that aged CBPs are significantly harder than fresh CBPs, indicating that ageing in oil modifies the turbostratic crystal structure of CBPs and alters its mechanical properties, potentially affecting tribological performance.

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In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils

Abstract

Bibliographical note

Funder

Keywords

ASJC Scopus subject areas

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