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

Murray, James W.; Rance, Graham A.; Xu, Fang; Hussain, Tanvir

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.

Citation

Murray, J. W., Rance, G. A., Xu, F., & Hussain, T. (in press). Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear. Journal of the European Ceramic Society, https://doi.org/10.1016/j.jeurceramsoc.2017.10.022

• Journal Article Type: Article
• Acceptance Date: Oct 11, 2017
• Online Publication Date: Oct 12, 2017
• Deposit Date: Nov 10, 2017
• Publicly Available Date: Oct 13, 2018
• Journal: Journal of the European Ceramic Society
• Print ISSN: 0955-2219
• Electronic ISSN: 1873-619X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1016/j.jeurceramsoc.2017.10.022
• Keywords: Graphene nanoplatelets ; Ceramic matrix composite ; Nanocomposite ; Nanoparticles ; Alumina ; Wear ; SHVOF ; Thermal spray
• Public URL: https://nottingham-repository.worktribe.com/output/887654
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0955221917306908