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Discontinuous Dissolution of Spinel Precipitates in the Al2O3-Fe2O3 System

Published online by Cambridge University Press:  15 February 2011

Ho-Yong Lee  and
Suk-Joong L. Kang
Ho-Yong Lee
Affiliation:
Department of Materials Science and Engineering, Sunmoon University, Tangjeong-Myun, Asan-Kun, Chungnam 337-840, Korea
Suk-Joong L. Kang
Affiliation:
Department of Ceramic Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea
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Abstract

The discontinuous dissolution of oxide particles has been investigated in the Al2O3 -Fe2O3 system by changing oxygen partial pressure (PO2) and temperature. In PO2 change experiment, 95Al2O3-5Fe2O3 (in wt%) powder compacts were sintered at 1500°C in PO2=0.001 atm and then annealed at 1500°C in air. In temperature change experiment, 85Al2O3-15Fe2O3 (in wt%) powder compacts were sintered at 1600°C in air and then annealed at 1450°C in air. During annealing the sintered specimens, which contained corundum grains and iron aluminate spinel particles, the grain boundaries migrated concomitantly with the dissolution of spinel particles. A discontinuous dissolution of spinel precipitates thus occurred, when the grain boundary migration of alumina in a two phase mixture of corundum and spinel was induced by PO2 or temperature change. The present result would be a distinct observation of the discontinuous dissolution of precipitates in ceramic systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 319
Copyright
Copyright © Materials Research Society 1995

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