A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

In this work, five different concentrations of a mixture of TiO2/Al2O3 nanopowders in an alcoholic suspension at 10wt.% solid content were sprayed by Suspension Plasma Spraying on steel discs. The influence of the presence of TiO2 at 0, 13, 40 and 75wt.% in Al2O3 was analysed by studying the propert...

Full description

Saved in:
Bibliographic Details
Published in:Surface & coatings technology 2015-09, Vol.278, p.25-29
Main Authors: Klyatskina, E., Rayón, E., Darut, G., Salvador, M.D., Sánchez, E., Montavon, G.
Format: Article
Language:English
Subjects:
Al2O3–TiO2
Alcoholic suspension
Aluminum oxide
Coating densification
Coatings
Densification
Microscopy
Nanoindentation
Nanostructure
Sprayers
Sprays
Suspension plasma spraying
Titanium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work, five different concentrations of a mixture of TiO2/Al2O3 nanopowders in an alcoholic suspension at 10wt.% solid content were sprayed by Suspension Plasma Spraying on steel discs. The influence of the presence of TiO2 at 0, 13, 40 and 75wt.% in Al2O3 was analysed by studying the properties of the sprayed coatings. Microscopy analysis of the projected coatings revealed a homogeneously distributed microstructure, where the densification of the coating increases with TiO2 content, while the original nanostructure is maintained. A nanoindentation study revealed an increment of nanohardness and elastic modulus due to the densifying effect of TiO2. The addition of significant amounts of TiO2 has been revealed as necessary in order to favour the fusion of Al2O3 in the SPS process. [Display omitted] •Al2O3–TiO2 coatings with retained nanostructure were obtained by SPS.•TiO2 acts as a flux agent in the presence of Al2O3.•Density and hardness of coatings increase with TiO2 content.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2015.07.029