Preparation of nanostructured alumina–titania composite powders by spray drying, heat treatment and plasma treatment

Preparation of agglomerated powders for air plasma spraying MoSi2 coating

“…This can be explained by the densification effect of the MoSi 2 particles. It is known that the density of the powders affects the density of coatings and bulk ceramics [20]. High density is one of the pre-requisites in order to obtain the high performance of coatings and bulk ceramics.…”

“…Moreover, the particles exhibit a smooth surface with high sphericity. The in-flight particles in the plasma spray process exhibit high flow velocity (about 150-300 m/s) and the amount of time the powders spent in the plasma flame is very short (about 10 À 3 -10 À 4 s) [20]. However, most of the powders can be melted fully owing to their high thermal conductivity.…”

“…It is evident that the surface of the plasma treated powders shows obvious signs of melting. The particles in the high energy plasma flame undergo a fast liquid sintering process [20,22]. Fig.…”

An investigation of the characteristics of Al2O3/TiO2 PEO nanocomposite coating

“…A mixture of these two oxides may provide materials with characteristics superior to each one of them individually [13]. Many industries such as machinery, textile and printing are interested in Page 5 of 38 A c c e p t e d M a n u s c r i p t 5 Al 2 O 3 /TiO 2 composite coatings due to their high hardness, excellent wear and corrosion properties, and chemical and thermal high resistance [14]. Thermal spray is a usual method to apply these types of coatings.…”

“…Moreover, nanostructured coatings which possess superior properties than the usual coatings cannot be obtained through this way [14].…”