Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Murray, James W. and Rance, Graham A. and Xu, Fang and Hussain, Tanvir (2017) Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear. Journal of the European Ceramic Society . ISSN 1873-619X

[img] PDF - Repository staff only until 12 October 2018. - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Available under Licence Creative Commons Attribution Non-commercial No Derivatives.
Download (2MB)

Abstract

An alumina coating containing 1 wt.% graphene nanoplatelets (GNPs) is deposited for the first time by suspension high velocity oxy-fuel (SHVOF) thermal spraying – an emerging coating deposition technique. Raman spectroscopy shows the GNPs survive the process albeit with a two-fold increase in the density of defects in the graphitic lattice. Dry-sliding wear testing at a 10 N load yields a two order of magnitude reduction in the specific wear rate for the alumina/GNP composite in comparison to the equivalent pure alumina coating. Testing with varying loads shows that the transition to the severe wear regime is prevented until between 30 and 35 N for the alumina + GNP coating which otherwise occurs between 5 and 7.5 N in the absence of GNPs. A reinforced microstructure, and specifically fracture toughness, explains the improved wear behaviour as opposed to tribofilm formation.

Item Type: Article
Keywords: Graphene nanoplatelets ; Ceramic matrix composite ; Nanocomposite ; Nanoparticles ; Alumina ; Wear ; SHVOF ; Thermal spray
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1016/j.jeurceramsoc.2017.10.022
Depositing User: Eprints, Support
Date Deposited: 10 Nov 2017 12:10
Last Modified: 10 Nov 2017 17:40
URI: http://eprints.nottingham.ac.uk/id/eprint/48050

Actions (Archive Staff Only)

Edit View Edit View