Composition, structure and mechanical properties of metal oxide coatings produced on titanium using plasma spraying and modified by micro-arc oxidation

Metal oxide coatings on VT6 titanium alloy were formed by plasma spraying of aluminum oxide powder and subsequent microarc oxidation at a current density from 1 to 3 kA/m2. As a result of combined treatment, metal oxide coatings consisting of a mixture of aluminum and titanium oxides were obtained o...

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Bibliographic Details
Published in:Ceramics international 2018-08, Vol.44 (11), p.12593-12599
Main Authors: Koshuro, Vladimir, Fomin, Aleksandr, Rodionov, Igor
Format: Article
Language:English
Subjects:
Alumina
Micro-arc oxidation
Plasma spraying
Titania
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Summary:Metal oxide coatings on VT6 titanium alloy were formed by plasma spraying of aluminum oxide powder and subsequent microarc oxidation at a current density from 1 to 3 kA/m2. As a result of combined treatment, metal oxide coatings consisting of a mixture of aluminum and titanium oxides were obtained on the surface of titanium samples. The most pronounced changes in the morphology of the plasma-sprayed coating were observed at the highest current density of 3 kA/m2. The open porosity decreased from 56% to 38% due to the modification by micro-arc discharges, whereas the microhardness increased from 1013 ± 150 HV to 1639 ± 31 HV.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2018.04.056