Abstract No.:	2681
Title:	Evaluation of mechanical properties and damage resistance of SPS TiO2 coatings by nanoindentation and nanoscratch techniques
Authors:	Enrique Sánchez / Instituto de Tecnología Cerámica - Asociación de Investigación de las Industrias Cerámicas. Universitat Jaume I, Spain Emilio Rayón / Instituto de Tecnología de Materiales, Universidad Politécnica de Valencia, Spain Victoria Bonache/ Instituto de Tecnología de Materiales, Universidad Politécnica de Valencia, Spain Rut Benavente/ Instituto de Tecnología de Materiales, Universidad Politécnica de Valencia, Spain Maria Dolores Salvador/ Instituto de Tecnología de Materiales, Universidad Politécnica de Valencia, Spain Emilie Bannier/ Instituto de Tecnología Cerámica - Asociación de Investigación de las Industrias Cerámicas, Universitat Jaume I de Castellón, Spain G. Darut/ SPCTS, UMR CNRS 6638. Faculté des Sciences et Techniques. Université de Limoges, France Alain Denoirjean/ SPCTS, UMR CNRS 6638. Faculté des Sciences et Techniques. Université de Limoges, France Hélène Ageorges/ SPCTS, UMR CNRS 6638. Faculté des Sciences et Techniques. Université de Limoges, France
Abstract:	TiO2 coatings can be used as self-cleaning and sterilizing surfaces due to their photocatalytic properties. In the last few years, the suspension plasma spraying (SPS) technique has proved to be a feasible and inexpensive technique for producing photocatalytic, TiO2-based surfaces with acceptable photoactivity performance. The aim of this study was to examine the relationship of the mechanical properties and scratch resistance of photoactive layers of TiO2 coatings obtained by SPS to the TiO2-coating microstructure. These properties were determined by nanoindentation and nanoscratch techniques. A commercial, nanoparticle TiO2 aqueous suspension was used as feedstock. Different plasma spraying conditions were used to vary the anatase/rutile concentrations, which were characterized by Raman spectroscopy. FESEM images revealed that the rutile phase was surrounded by fine anatase crystals. Mechanical maps of cross-sectional layers showed good agreement with the anatase and rutile hardness and Youngs modulus reported in the literature. Higher concentrations of the softer anatase phase enhanced the scratch damage. These results enable TiO2-coating photoactivity and mechanical properties to be optimized for industrial applications by tailoring the coating microstructure

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