Microstructure and abrasion resistance of plasma sprayed titania coatings
Abstract
Agglomerated titania nanopowder and a “classical” titania were sprayed by the high throughput water-stabilized plasma (WSP) and thoroughly compared. Optical microscopy with image analysis as well as mercury intrusion porosimetry were used for quantification of porosity. Results indicate that the “nano” coatings in general exhibit finer pores than coatings of the “conventional” micron-sized powders. Mechanical properties such as Vickers microhardness and slurry abrasion response were measured and linked to the structural investigation. Impact of the variation in the slurry composition on wear resistance of tested coatings and on character of the wear damage is discussed. The overall results, however, suggest that the “nano” coatings properties are better only for carefully selected sets of spraying parameters, which seem to have a very important impact.
- Publication:
-
Journal of Thermal Spray Technology
- Pub Date:
- December 2006
- DOI:
- 10.1361/105996306X146749
- Bibcode:
- 2006JTST...15..689C
- Keywords:
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- image analysis;
- slurry abrasion;
- titanium oxide;
- waterstabilized plasma