Abstract
The effect of oriented α‐Al2O3 platelets on densification and shrinkage behavior of tape‐cast α‐Al2O3 during solid‐state sintering was studied using dilatometric sintering shrinkage experiments and microstructural characterization. Platelet‐free alumina samples exhibit isotropic shrinkage with an ∼17% linear final shrinkage. The addition of platelets retards densification, and results in anisotropic shrinkage. Initially during sintering, shrinkage is isotropic for platelet‐containing systems; however, it becomes highly anisotropic by inhibition of shrinkage in the platelet orientation direction. In the 10 vol% platelet‐containing system, shrinkage was ∼12% in the casting and the transverse directions and ∼20% in the direction perpendicular to the casting plane.
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