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Synthesis of α–Al2O3 platelets using sodium sulfate flux

Published online by Cambridge University Press:  31 January 2011

Shinobu Hashimoto  and
Akira Yamaguchi
Shinobu Hashimoto*
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466–8555, Japan
Akira Yamaguchi
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466–8555, Japan
*
a)Address all correspondence to this author. e-mail: shinobuh@mse.nitech.ac.jp
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Abstract

When powder mixtures of {Al2(SO4)3 + Na2SO4}or {γ–Al2O3 [obtained by heating Al2(SO4)3 at 900 °C for 3 h] + Na2SO4} were heated in an alumina crucible at 1100 °C for 1 h, α–Al2O3 platelets were formed. The powder mixture of {Al2(SO4)3 + 2Na2SO4} yielded aggregations of platelets that were less than 5 μm in size. The size of the aggregations increased in proportion to the amount of Na2SO4, and aggregations of 120 μm were obtained using a mixture of {Al2(SO4)3 + 6Na2SO4}. The powder mixture of {γ–Al2O3 + 2Na2SO4 yielded hexagonal platelets having an average diameter of 3.7 μm and an average thickness of 0.3 μm. In addition to aggregation size, the size of the hexagonal platelets also increased in proportion to the amount of Na2SO4, and platelets having an average diameter of 5 μm were obtained using a mixture of {γ–Al2O3 + 6Na2SO4}.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4667 - 4672
Copyright
Copyright © Materials Research Society 1999

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