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The very good combination of mechanical and thermal properties of oxide-based coatings makes them a desirable coating working in harsh conditions that involve mechanical and corrosive factors. Nowadays, the most common methods for a ceramic coating deposition are an atmospheric plasma spraying (APS) [1] and the high-velocity oxygen fuel (HVOF) thermal spraying [2]. The APS sprayed ceramic coatings are widely applied to structural materials and various machine parts in order to improve wear, oxidation and corrosion resistance [3]. The effect of spraying on fatigue properties of structural materials in the ultra-high-cycle regime was also examined; only a weak influence was observed [4]. Among the alumina-based coatings, particularly those containing TiO 2 are of interest since they possess enhanced toughness and wear resistance compared to Al 2 O 3 coatings [5]. They are conventionally used hard coatings for their resistance to chemical and abrasive wear characteristics. Plasma sprayed Al 2 O 3 -TiO 2 coatings have been widely used as wear, corrosion and thermal resistant coatings in machinery, textile, printing, and aerospace industries [6], [7]. Addition of various amounts of TiO 2 to Al 2 O 3 feedstock can change their mechanical properties. Titania in alumina is intended to lower the melting temperature of the mixture due to the lower melting temperature of titania compared to the melting temperature of alumina, which in turn facilitates the melting process of alumina-titania powders [8]. In addition, the fracture toughness is an important phenomenon affecting tribological properties and this is allowed by the TiO 2 additive to improve the wear resistance [9]. The wear of ceramic coatings is sensitive to their mechanical properties and therefore they should be characterized in details. This study aims to identify the effects of TiO 2 addition to Al 2 O 3 powder on the mechanical behavior of plasma-sprayed Al 2 O 3 -TiO 2 coatings.

Influence of the Titania Content on the Microstructure and Properties of Plasma Sprayed Alumina-Titania Coatings