Abstract
Compacts of spherical alumina particles with and without c-axis orientation were prepared in high magnetic field and were employed to separate the shape and crystalline factors for the anisotropic sintering in alumina compacts. The compact of the spherical particles showed markedly anisotropic shrinkage in sintering when they are oriented. Isotropic shrinkage was noted when the particles were randomly oriented. Clearly, the crystalline factor plays an important role in the anisotropic shrinkage in sintering. The shape factor also plays a role in the anisotropic shrinkage in alumina compacts made of industrial grade powder.
