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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

Authors

James W. Murray

Graham A. Rance

Fang Xu

Tanvir Hussain



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.

Journal Article Type Article
Journal Journal of the European Ceramic Society
Print ISSN 0955-2219
Electronic ISSN 1873-619X
Publisher Elsevier
Peer Reviewed Peer Reviewed
APA6 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, doi:10.1016/j.jeurceramsoc.2017.10.022
DOI https://doi.org/10.1016/j.jeurceramsoc.2017.10.022
Keywords Graphene nanoplatelets ; Ceramic matrix composite ; Nanocomposite ; Nanoparticles ; Alumina ; Wear ; SHVOF ; Thermal spray
Publisher URL http://www.sciencedirect.com/science/article/pii/S0955221917306908
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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