Abstract
Ceramic raw material (silicon nitride powder; 90%-α-Si3N4) was ground by a vibration ball-mill, of which a pot and balls were made of alumina. In the case of wet grinding in ethyl alcohol (C2H5OH), the wear of the pot and the balls was large but it was not so great in dry and wet grinding in trichlorotrifluoroethane (CFCl2CF2Cl). It was recognized that the particle size distribution of the product ground for 200 (300) hours became smaller and that the specific surface area was increased from 4.5m2/g for the as-received material to 10m2/g. Finally, the structual lattice irregularity was examined using the X-ray diffraction method.
