Process for producing an ultrafine powder of aluminum nitride

摘要

Disclosed is a process for producing an ultrafine powder of aluminum nitride. This process is characterized in adding 1-5 wt % of aluminum nitride powder to the mixture of alumina and carbon black and heating the resulting powder mixture at a temperature of 1550 DEG -1650 DEG C. in an atmosphere of nitrogen. Preferably, prior to heating, the powder mixture is shaped into a compact. The aluminum nitride powder prepared by the process of the present invention has an average particle diameter of about 0.45 micron and a purity of above 98.1%, and is therefore a very suitable material for making printed circuit boards and heat release boards for IC, LSI and VLSI.