Plasma spray coating of spray-dried Cr2O3/wt%TiO2 powder

An agglomerated C2O3/wt.%TiO2 powder has been fabricated by the spray dryin g process under different parameters. The spray-dried powder has well-agglo merated particles of spherical shape. In the conditions of the high slurry feed rate and low binder concentration in the slurry, the powder has large cavities inside some particles and ruggedness over their surface. The optim um plasma spray feed rate has been found by examining the spraying behavior of the powder and melted state of particles, The plasma spray coating has been performed under different process variables such as spraying distance and plasma power. These parameters strongly affect the characteristics of t he coated layer: microstructure, hardness, and bond strength.