Process for producing spherical aluminum nitride powder and spherical aluminum nitride powder produced by the same process

摘要

To provide a process capable of efficiently producing a spherical aluminum nitride powder having a size most suited for use as a filler, and having a high sphericalness and a large particle strength.;A spherical aluminum nitride powder is produced by using a spherical granulated product of an alumina powder or an alumina hydrate powder as a starting material, and feeding the spherical granulated product to the step of reductive nitrogenation so as to be reductively nitrogenated.

主权项

1. A process for producing a spherical aluminum nitride powder by using a spherical granulated product of an alumina powder or an alumina hydrate powder as a starting material, and feeding said spherical granulated product to the step of reductive nitrogenation so as to be reductively nitrogenated;
wherein said spherical granulated product of said alumina powder or said alumina hydrate powder has a BET specific surface area of 30 to 500 m2/g; further including the step of heat treatment for once heat-treating said spherical granulated product to lower the BET specific surface area of said spherical granulated product prior to conducting said step of reductive nitrogenation; wherein said heat treatment is conducted to such a degree that the BET specific surface area is lowered but is maintained to be at least not less than 2 m2/g.