Sinterable Si3N4 powder and a process for its preparation

摘要

Sinterable Si3N4 powder having an average particle size of less than 1 mu m, wherein no individual particle has a diameter greater than 100 mu m, the total content of metallic impurities of the powder is less than 1000 ppm and the iron content is less than 200 ppm is produced by grinding agglomerated Si3N4 in a spiral jet mill.