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Synchrotron X-ray spectromicroscopy analysis of wear tested graphene-containing alumina coatings

Mulone, Antonio ; Silva, Plinio Fernandes Borges ; Yuan, Hui ; Thånell, Karina LU ; Hitchcock, Adam and Klement, Uta (2024) In Carbon 227.
Abstract

Thermally sprayed Al2O3 coatings containing graphene nano platelets (GNP) have been shown to exhibit improved wear resistance. To understand the positive influence of GNP on wear properties, scanning transmission X-ray microscopy (STXM) analyses were performed to determine the structural and chemical changes that occur on the GNP and alumina matrix after wear tests. STXM results acquired at the C K-edge showed that the GNP are aligned parallel to the specimen surface in the as-sprayed coatings. GNP flakes are also observed at the tribo-surface of the wear tested sample. The results obtained at the Al K-edge show that the aluminum oxide below the wear track becomes amorphous during the wear test and carbon is... (More)

Thermally sprayed Al2O3 coatings containing graphene nano platelets (GNP) have been shown to exhibit improved wear resistance. To understand the positive influence of GNP on wear properties, scanning transmission X-ray microscopy (STXM) analyses were performed to determine the structural and chemical changes that occur on the GNP and alumina matrix after wear tests. STXM results acquired at the C K-edge showed that the GNP are aligned parallel to the specimen surface in the as-sprayed coatings. GNP flakes are also observed at the tribo-surface of the wear tested sample. The results obtained at the Al K-edge show that the aluminum oxide below the wear track becomes amorphous during the wear test and carbon is dissolved in it. Wear tests performed on thermally sprayed pure alumina samples (without GNP) and on sintered bulk alumina prove that neither the presence of GNP nor the porosity in the coating are responsible for the amorphization of the alumina matrix. The results discussed in this work advance the fundamental understanding of graphene-containing composites, which is considered very important to exploit the unique advantages of graphene in technological applications.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Coatings, Graphene, STXM, Synchrotron, TEM
in
Carbon
volume
227
article number
119245
publisher
Elsevier
external identifiers
  • scopus:85194244144
ISSN
0008-6223
DOI
10.1016/j.carbon.2024.119245
language
English
LU publication?
yes
id
2270d8fa-cbeb-4800-aa78-6f5c7ee4e41c
date added to LUP
2024-08-14 15:30:31
date last changed
2024-08-14 15:31:58
@article{2270d8fa-cbeb-4800-aa78-6f5c7ee4e41c,
  abstract     = {{<p>Thermally sprayed Al<sub>2</sub>O<sub>3</sub> coatings containing graphene nano platelets (GNP) have been shown to exhibit improved wear resistance. To understand the positive influence of GNP on wear properties, scanning transmission X-ray microscopy (STXM) analyses were performed to determine the structural and chemical changes that occur on the GNP and alumina matrix after wear tests. STXM results acquired at the C K-edge showed that the GNP are aligned parallel to the specimen surface in the as-sprayed coatings. GNP flakes are also observed at the tribo-surface of the wear tested sample. The results obtained at the Al K-edge show that the aluminum oxide below the wear track becomes amorphous during the wear test and carbon is dissolved in it. Wear tests performed on thermally sprayed pure alumina samples (without GNP) and on sintered bulk alumina prove that neither the presence of GNP nor the porosity in the coating are responsible for the amorphization of the alumina matrix. The results discussed in this work advance the fundamental understanding of graphene-containing composites, which is considered very important to exploit the unique advantages of graphene in technological applications.</p>}},
  author       = {{Mulone, Antonio and Silva, Plinio Fernandes Borges and Yuan, Hui and Thånell, Karina and Hitchcock, Adam and Klement, Uta}},
  issn         = {{0008-6223}},
  keywords     = {{Coatings; Graphene; STXM; Synchrotron; TEM}},
  language     = {{eng}},
  month        = {{06}},
  publisher    = {{Elsevier}},
  series       = {{Carbon}},
  title        = {{Synchrotron X-ray spectromicroscopy analysis of wear tested graphene-containing alumina coatings}},
  url          = {{http://dx.doi.org/10.1016/j.carbon.2024.119245}},
  doi          = {{10.1016/j.carbon.2024.119245}},
  volume       = {{227}},
  year         = {{2024}},
}