WATER-BASED METHODS FOR PRODUCING HIGH GREEN DENSITY AND TRANSPARENT ALUMINUM OXYNITRIDE (ALON)

摘要

The present invention provides a water-based method for producing Aluminum oxynitride green bodies characterized by a density of at least 60% as measured by green density measurements. The method comprises steps selected from: (a) ball-milling alumina powder and deflocculant in water for a period of time; (b) homogeneously dispersing AlN in said ball-milled product; (c) vacuum drying said product; thereby providing dense green bodies; and, (d) sintering said dense green bodies in nitrogen for several time durations. The method may comprise steps of: (a) ball-milling Al2O3 and deflocculant in water for a period of time; (b) homogeneously dispersing AlN in said ball milled product; (c) pressure filtering said product; thereby providing dense green bodies; (d) removing NH3 by vacuum drying said dense green bodies; (e) performing polymer burnout; and, (f) sintering the product of step (e) in nitrogen for several time durations.