Fabrication of Grain-Oriented Bi2WO6 Ceramics

Autor:	Robert E. Newnham, T. Kimura, M. H. Holmes
Rok vydání:	1982
Předmět:	Fabrication Yield (engineering) Materials science Sintering law.invention Grain growth law visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Calcination Ceramic Crystallite Composite material Dissolution
Zdroj:	Journal of the American Ceramic Society. 65:223-226
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1982.tb10410.x
Popis:	Grain-oriented Bi2WO6 ceramics were fabricated by normal sintering techniques. Platelike crystallites were initially synthesized by a fused salt process using an NaCl-KCI melt. When calcined at 850°C, =100 μm. After dissolving away the salt matrix, the Bi2WO6 particles were mixed with an organic binder and tapecast to align the platelike crystallites. Large particles were easily oriented by tapecasting but the sinterability of the tape was poor. Preferred orientation of small particles was increased by tapecasting and grain growth during sintering further improves the degree of orientation. Sintering above the 950°C phase transition, however, results in discontinuous grain growth and low densities. Optimum conditions for obtaining highly oriented ceramics with high density occur at sintering temperatures of 900°C using fine-grained powders which yield orientation factors of =0.88 and densities of 94% theoretical.
Databáze:	OpenAIRE
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