Abstract
Particle shape has been recognized as one of the important properties of the particle present in powders, composite materiales and so on.
In this paper, ball milling was carried out on spherical zinc particles to get flaky ones. The mill used was made of alumina with a diameter of 144mm and the inner length of 130mm. Its volume was about 2.1 liters. The balls charged were also alumina with a diameter of 20mm. The progress of flakiness of particles was evaluated by the size distributions, the specific surface area and the observation by SEM of flaky products.
The following results were obtained.
(1) The median diameter of flaky products increased with increase in the milling time.
(2) The increase of particle size-may arise for the flaking of particles in an early stage but the coalescence of particles in the later stage.
(3) It was presumed that the flaking of particles occurred during the specific surface area calculated by the flaking model of particles-measured by BET method relations have liniality.
