Sintering Behavior of Fine-Ground Alumina Powders by Wet Rotation Ball Milling and Microstructures of Fired Bodies

Abstract

Sintering behavior of some fine-ground alumina powders with various particle sizes and lattice strains prepared by wet rotation ball milling method were investigated. It was found that easy-to-sintering of powders was dependent on the particle size and independent of the lattice strain; hence, it was taken that mechanochemical effects did not contribute to easy-to-sintering of powders. Platelike grains, which grew in the transverse to c-axis, were formed in the sintered body of all ground powders. These grains grew largely as the particle size of ground powders increased. And it could be suggested that there is a possibility of controlling the platelike grain size by the particle size of the powder.