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Graded evolution of anisotropic microstructure during sintering from crystal-oriented powder compact
Authors:Shoko Baba  Alexandre Maître  Nicolas Pradeilles  Guy Antou  Nobuo Saito  Satoshi Tanaka
Affiliation:1. Deparment of Materials Science and Technology, Nagaoka University of Technology, Niigata, Japan;2. University of Limoges, Limoges, France
Abstract:Anisotropic sintering, including shrinkage and grain growth, was examined for c-axis-oriented (Sr,Ca)2NaNb5O15 (SCNN) ceramics, which were prepared by colloidal processing under a magnetic field. In the c-axis-oriented SCNN powder compact, shrinkage and grain growth along the c-axis were higher than those along the a-axis. The anisotropic microstructural development was clearly associated with anisotropic sintering shrinkage. X-ray diffraction, scanning electron microscopy, and energy back scattering diffraction showed that the grain growth of oriented particles by including random grains contribute to the development of the oriented microstructure. Finally, the highly crystal-oriented SCNN ceramics with a densified microstructure were obtained through anisotropic sintering. These results clearly showed the potential to develop a well-defined anisotropic microstructure during sintering by designing and controlling the particle packing structure in a powder compact.
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