Studies on spray efficiency and chemical analysis and density of the plasma sprayed A12O3 and its mixtures with TiO2 coatings

Abstract Al2O3 and its mixture with 3% TiO2 powder has been prepared by the fused and crushed method. Al2O3 + 13% TiO2 and A12O3 +40% TiO2 powders are mixtures of Al2O3 + 3% TiO2 and 10% and 37% of blend TiO2 respectively. The size distributions of the powders are analysed and the median diameters of the powders are measured. Coatings were prepared using plasma spraying at 10, 12 and 16 KW power inputs from all powders. The spray efficiencies of the powders were measured and are discussed. Efficiency is found to inerease with inereases in power input and % of TiO2 added in the powder. Chemical composition of the powder and coatings are measured and results are discussed. The composition of the composite coatings was found to be different than that in the powder. It is found to match almost with the powder composition at higher power. The bulk density of the coatings prepared at different power inputs are studied. In Al2O3 the coating density inereases with inerease in power. In composite coatings it decre...