Anisotropic Sintering Shrinkage in Alumina Ceramics Containing Oriented Platelets |
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| Authors: | I O Ozer E Suvaci B Karademir J M Missiaen C P Carry D Bouvard |
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| Affiliation: | Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26480 Eskisehir, Turkey; Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques, INP Grenoble, France; Laboratoire de Génie Physique et de Mécanique des Matériaux, INP Grenoble, France |
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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. |
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