Gomez-Gomez, A;
Nistal, A;
Garcia, E;
Isabel Osendi, M;
Belmonte, M;
Miranzo, P;
(2016)
The Decisive Role Played by Graphene Nanoplatelets on Improving the Tribological Performance of Y2o3-al2o3-sio2 Glass Coatings.
Materials & Design
, 112
pp. 449-455.
10.1016/j.matdes.2016.09.056.
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17- The decisive role played by graphene nanoplatelets on improving the tribological performance of YAS glas coatings-ACCEPTED.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Graphene nanoplatelets (GNPs) have proved to be effective fillers for enhancing the mechanical and tribological properties of bulk ceramics and glasses, also with the added benefit of developing electrical and thermal functionalities. Similarly, enhanced transport performance has recently been shown for glass-ceramics coatings of the Y2O3-Al2O3-SiO2 (YAS) system containing a small amount of GNP fillers, intended for applications in the aerospace industry. In the present work, the wear and friction behaviour of GNP/YAS coatings –containing 0, 1.2 and 2.3 wt.% GNPs- on silicon carbide substrates is evaluated. The flame spraying process used for coating fabrication induces a structure of splats oriented parallel to the substrate with GNPs located at the inter-splat boundaries forming a connected network of platelets mainly oriented parallel to the surface as well. Unlubricated ball–on-plate reciprocating wear tests show that both the friction coefficient and the wear rate decreased by 35% and 65%, respectively, for 2.3 wt.% of GNPs. A wear mechanism for GNP/YAS coatings based on both the progressive exfoliation of the graphene sheets and the effect of the GNPs on preventing crack propagation within the coating is proposed.
| Type: | Article |
|---|---|
| Title: | The Decisive Role Played by Graphene Nanoplatelets on Improving the Tribological Performance of Y2o3-al2o3-sio2 Glass Coatings |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.matdes.2016.09.056 |
| Publisher version: | https://doi.org/10.1016/j.matdes.2016.09.056 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Graphene, Glass, Coatings, Thermal spray, Wear, Friction |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10059416 |
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