Seminar: Solution precursor thermal spray of Nb-doped titanium oxide: from single splat to coating by Daniel Tejero Martín

Solution precursor thermal spray of Nb-doped titanium oxide: from single splat to coating

 By Daniel Tejero Martín

Abstract:

The appearance of novel thermal deposition methods such as suspension or solution precursor thermal spraying has expanded the capabilities in the production of coatings. The traditional limits on the feedstock particle size have been reduced or eliminated with these new techniques. In addition, the microstructure and characteristics of the produced coatings differ from powder-based coatings, opening the door to new applications.

Titanium oxide is common thermal sprayed material, with applications such as anti-microbial coating or transparent conductive oxide (TCO) films. To improve its properties, a common practice is the introduction of exogenous components, being niobium considered a preferred option for the next generation of  TCOs and gas sensors.

This talk will present the characteristics of Nb-doped titanium oxide coatings deposited using solution precursor high velocity oxy-fuel (HVOF). It will focus on the correlation between spraying parameters and produced microstructure, proposing a model for the transformation of the initial solution precursor into solid splats. An investigation of the anatase and rutile phases, based on the ratios present at different spraying conditions, will also be presented.