A Study of Volume Reduction in Sintered Compacts of Spherical Particles

Influences of Grain-boundary in Two-particles System on Shrinkage

Abstract

The mechanism of shirinkage of a two-particles system was described. A paired spherical copper particles, which had been sieved so that the particle size is 53-45 μm, were sintered at 1223 K for 21.6 ks. It was clarified that the values of the amount of shrinkage dispersed between the theoretical values due to the variable-constantradius-interpenetration mechanism. It was also clarified that the scattering caused by the location of the grain boudary in the particles. The amount of shrinkage was at its maximum when the grain boundary existed in the neck between the particles and at its minimum when the grain boundary did not exist in the particles. Furthermore it was also shown to be possible, by energy calculation, for the grain boundary to be shifted or even eliminated depending on the ratio of each particle.