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Anisotropic Sintering Shrinkage in Alumina Ceramics Containing Oriented Platelets

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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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2006.01039.x

Affiliations: 1: Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26480 Eskisehir, Turkey 2: Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques, INP Grenoble, France 3: Laboratoire de Génie Physique et de Mécanique des Matériaux, INP Grenoble, France

Publication date: June 1, 2006

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