Agglomerated titania nanopowder and a “classical” titania were sprayed by the high throughput WSP and thoroughly compared. Optical microscopy with image analysis as well as mercury intrusion porosimetry were utilized 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 like 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 over-all 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.

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