Density Gradients and Sintered Dimensional Tolerance in Compacts Formed from Spray‐Dried Alumina

Abstract

This study proves that initial density gradients have lasting detrimental effects on final dimensional tolerances. X‐ray computed tomography has been used to quantify changes in density following sintering; associated dimensional changes have been monitored using a laser micrometer. Nonuniformities present in the green state are still present at an overall relative density of ∼73%; in fact, these nonuniformities are exaggerated. Major losses of dimensional tolerance are triggered by the initial density gradients.