NDLI: Suspension High Velocity Oxy-Fuel (SHVOF)-Sprayed Alumina Coatings: Microstructure, Nanoindentation and Wear

Content Provider	Springer Nature Link
Author	Murray, J. W. Ang, A. S. M. Pala, Z. Shaw, E. C. Hussain, T.
Copyright Year	2016
Abstract	Suspension high velocity oxy-fuel spraying can be used to produce thermally sprayed coatings from powdered feedstocks too small to be processed by mechanical feeders, allowing formation of nanostructured coatings with improved density and mechanical properties. Here, alumina coatings were produced from submicron-sized feedstock in aqueous suspension, using two flame combustion parameters yielding contrasting microstructures. Both coatings were tested in dry sliding wear conditions with an alumina counterbody. The coating processed with high combustion power of 101 kW contained 74 wt.% amorphous phase and 26 wt.% crystalline phase (95 wt.% gamma and 3 wt.% alpha alumina), while the 72-kW coating contained lower 58 wt.% amorphous phase and 42 wt.% crystalline phases (73 wt.% was alpha and 26 wt.% gamma). The 101-kW coating had a dry sliding specific wear rate between 4 and 4.5 × 10$^{−5}$ mm$^{3}$/Nm, 2 orders of magnitude higher than the 72-kW coating wear rate of 2-4.2 × 10$^{−7}$ mm$^{3}$/Nm. A severe wear regime dominated by brittle fracture and grain pullout of the coating was responsible for the wear of the 101-kW coating, explained by mean fracture toughness three times lower than the 72-kW coating, owing to the almost complete absence of alpha alumina.
Starting Page	1700
Ending Page	1710
Page Count	11
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	25
Issue Number	8
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2016-10-07
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	alpha alumina dry sliding wear gamma alumina HVSFS Rietveld refinement SHVOF Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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