REACTIVE COATING OF DOLOMITE ON ALUMINA SUBSTRATES

The feasibility of using reactive coating of dolomite to obtain an ori ented CaAl12O19 (hibonite) coating on alumina substrates has been show n. The textured hibonite grains grow oriented along the [110] directio n on the alumina substrate. By using single crystal of sapphire it has been proved that the orientation of the hibonite layer is Mot depende nt upon the crystal orientation of the alumina substrate. Alumina-alum ina sandwiches with a weak interface have been prepared using this rea ctive coating technique. (C) 1997 Elsevier Science Limited.