Characteristics of the Ground Alumina Powders by Wet Rotation Ball Milling

Abstract

Although new preparation methods for ceramic raw materials have been investigated, ball milling is still the most popular and useful preparation method. In this paper, characteristics of ground Bayer's α-alumina powders by wet rotation ball milling were investigated. The average particle size, the crystallite size and lattice strain of the ground alumina powder after 168-h grinding were 0.21μm, 28nm and 1%, respectively. The particle surface was remarkably irregular. Lattice interplanar spacing of alumina expanded and the lattice constant of c-axis increased by grinding. Annealing the ground powders resulted in liberation of lattice distortion and particle shape changed to nearly spherical form.