Effect of Agglomerated TiO_2 Powders with Nanostructure on Microstructure of Thermal Sprayed TiO_2 coatings(Materials, Metallurgy & Weldability)

概要

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The effect of nanostructure in agglomerated TiO_2 powders on the microstructure and crystal structure of TiO_2 coatings is examined. TiO_2 coatings on SUS304 plate were sprayed by plasma spray and high velocity oxy-fuel (HVOF) spray using two agglomerated TiO_2 powders with nano and sub-micron structures. The feedstock powders were synthesized via polyvinyl alcohol to produce spherical-shape agglomerates with an average grain size of 30-40μm from the original 200nm and 30nm particles. The powders were then introduced into the plasma and HVOF flame to produce a nanocrystalline coating. For HVOF spray process, various fuel gas pressures were used to find the best parameters. As a result, high anatase ratios could be achieved when HVOF was used at low fuel gas pressure (0.35MPa) by TiO_2 powders with particle sizes of 30nm.
大阪大学の論文