Sol-Gel Low Temperature Synthesis of α-Alumina: Effect of HNO3 Addition (II)

Abstract

The corumdum-seeded alumina gels were prepared from Al (O-sec-Bu)₃ by the sol-gel method using HNO₃ as a catalyst. Alumina gels were prepared in different batch-scales and were heat-treated for various times at 800°C. The possibility of mass production was examined by comparing their crystallization behavior. As a result, each gel was completely transformed to α-alumina at 800°C, but the gel from a larger batch required a longer heat-treatment time for complete α-transformation.