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Splat formation and microstructure of solution precursor thermal sprayed Nb-doped titanium oxide coatings by Tejero-Martin, Daniel; Pala, Zdenek; Rushworth, Simon; Hussain, Tanvir is a Materials Science article available to read on EtoBox.

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Solution precursor thermal spray can become a breakthrough technology for the deposition of coatings with novel chemistries; however, the understanding of the process that the feedstock material undergoes is still lacking when compared to more traditional presentations (i.e. powder and suspension). In this paper, niobiumdoped TiO 2 coatings were deposited by solution precursor high velocity oxy-fuel thermal spraying, studying its microstructure and phase. It was reported that a lower flame temperature produced a highly porous coating, while the porosity was reduced at higher flame temperature. Investigation of the phase content showed that, contrary to our current understanding, a higher flame power implied an increase of the anatase phase content for solution precursor spray. Three methods were used: Rietveld refinement, peak height and peak area of the x-ray diffraction patterns. Additionally, single splats were analysed, showing that as the precursor travels through the flame, pyrolysis and sintering takes place to form the solid material. These results were used to derive a model of the physico-chemical transformation of the solution precursor. This work proves that solution pr

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Author

Tejero-Martin, Daniel; Pala, Zdenek; Rushworth, Simon; Hussain, Tanvir

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0272-8842)

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)