Graded evolution of anisotropic microstructure during sintering from crystal‐oriented powder compact. Issue 2 (30th August 2019)

• Record Type: Journal Article
• Authors: Baba, Shoko; Maître, Alexandre; Pradeilles, Nicolas; Antou, Guy; Saito, Nobuo; Tanaka, Satoshi
• Is Part Of: International journal of applied ceramic technology. Volume 17:Issue 2(2020)
• Page Start: 677
• Page End: 684
• Publication Date: 2019-08-30
• Subjects: Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.13360
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: Anisotropic sintering, including shrinkage and grain growth, was examined for c‐axis‐oriented (Sr, Ca)2 NaNb5 O15 (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. Abstract : Band contrast and EBSD map of oriented samples heat treated at (A, B)1230°C and (C, D)1260°C for 30min observed from perpendicular to the rotating magnetic field. (A, C) band contrasts, (B, D) EBSD map of x‐direction and (E) stereographic triangle. The grain growth of oriented grains with includings random fine grains..