Influence of behaviour of alumina slurry on quality of alumina powder prepared by jet wheel impact atomization

Alumina slurries prepared in pilot plant scale have been characterized in terms of slurry rheology and stability and processed in a spray drier based on jet wheel impactor for atomization. Spheroidal alumina granules have been produced and their density, particle size and flowability behaviour are determined. Microstructure of the spheroidal granules has been observed under SEM and results are reported. The powders find application in plasma spray coatings, production of dense ceramic parts, components and tiles.

Plasma spray grade alumina powder with flow function in the range of 17–18 has been produced from high alumina containing alumina slurry using a newly developed jet wheel atomization based spray dryer. This figure shows the scanning electron micrograph of a) starting A16 (Alcoa) and b) plasma spray grade alumina powder.Figure optionsDownload as PowerPoint slide