Plasma sprayed TiO sub(2): The influence of power of an electric supply on particle parameters in the flight and character of sprayed coating

• Published in: Journal of the European Ceramic Society 2010-11, Vol.30 (15), p.3131-3136
• Main Authors: Ctibor, Pavel, Hrabovsky, Milan
• Format: Article
• Language: English
• Subjects: Coating; Diffraction; Doppler effect; Electric power generation; Microstructure; Sprayers; Sprays; Titanium dioxide
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2010.05.029

The influence of input power on sprayed powder and final coating was quantified for a water-stabilized plasma spray torch (WSP super([registered])) and ceramic coating formed from titanium dioxide (TiO sub(2)). All other spray setup parameters were secured during the experiment with electric supply power as the only variable factor. In-flight particles were characterized by a Doppler particle velocimetry, the microstructure of the coatings was observed by microscopic techniques with computer image analysis, and phase composition was studied by X-ray diffraction. Various mechanical properties were measured - microhardness, surface roughness, and wear resistance in a slurry. Also other particular physical characteristics of the coatings - reflectivity and bandgap energy - were observed in their dependence on the supply power because they are associated with applications of the coatings. The higher the power the higher the coating quality will be: both its microstructure and mechanical performance. This substantial difference has the same trend for both power supplies utilized for the testing.