Reactive coating of dolomite on alumina substrates

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