PREPARATION OF ALUMINUM NITRIDE POWDER FROM ALUMINUM POLYNUCLEAR COMPLEXES

AIN powder was synthesized from aluminum polynuclear complexes. Basic aluminum chloride and basic aluminum lactate were used as the aluminum polynuclear complexes. These starting materials and glucose were dissolved in water and mixed homogeneously. AIN powder was obtained by calcining after drying and precalcining at 800-degrees-C under nitrogen gas flow. Then excess carbon was removed by firing in air. Nitridation in the system was investigated and compared with that in the alumina-carbon black system. It was found that in our reaction system nitridation began and proceeded at lower calcination temperatures above 1200-degrees-C than in the alumina-carbon black system. Using aluminum polynuclear complexes, AIN was synthesized through the nitridation of gamma-alumina and produced in a very fine and sharp particle size distribution.