Abstract
Shrinkage during sintering of ceramics was examined for the ZnO system to investigate anisotropic shrinkage, which was noted in the alumina system in c-axis oriented powder compacts. In this system, the shrinkage and elongation of grains are significantly large in directions parallel and normal to the c-axis, respectively. In this work, ZnO powder compacts of c-axis oriented and randomly oriented particles were prepared in a magnetic field. In contrast to the alumina system, the shrinkage along the a-axis was higher than that along the c-axis. Grains are elongated along the a-axis, which is again opposite to the situation for the alumina system. The origin of this anisotropic sintering behaviour is ascribed to anisotropic material properties rather than a geometric effect.
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