Abstract
The triaxial compaction tests were made on a spherical atomized copper powder and an angular alpha alumina powder, which are both very hard to be formed by means of the conventional die or isostatic compactions. The shearing effect of the stress difference in this method on the forming and compacting of these powders was studied on the basis of the experimental results of the densification and the particle morphology on these compacts. The results obtained are as follows:
1) On the atomized copper powder, the shearing effectively exercised to induce plastic deformation and frictional welding of the particles and considerably lowered the compressive stress for the forming as compared with those in the conventional methods.
2) The effect on the forming of the alpha alumina powder was only to facilitate rearrangement and interlocking of the particles. For the forming of this sort of powder consisting of the particles with poor plastic deformability, the triaxial compaction was less advantageous.
