good aluminiumnitridepoeder of high purity and method for preparation thereof and formed sintered object.

摘要

A fine powder of aluminum nitride having an average particle diameter of not more than 2 microns and comprising at least 94% by weight of aluminum nitride, at most 3% by weight of bound oxygen and at most 0.5% by weight as metal of metal compounds as impurities. The fine aluminum nitride powder is prepared from a fine alumina powder and a fine carbon powder as starting materials. The fine aluminum nitride powder provides a sintered body having a high purity and a high density such as at least 2.9 g/cm3. The fine aluminum nitride powder is also useful as a raw material for alpha-Sialson, beta-Sialon and AlN polytypes, as an addition aid in various ceramics.