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Thermally stable high-strength porous alumina

Published online by Cambridge University Press:  06 January 2012

D. Doni Jayaseelan
Affiliation:
Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya-463 8687, Japan
S. Ueno
Affiliation:
Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya-463 8687, Japan
J. H. She
Affiliation:
Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya-463 8687, Japan
T. Ohji
Affiliation:
Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya-463 8687, Japan
S. Kanzaki
Affiliation:
Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya-463 8687, Japan
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Abstract

A two-step heating schedule involving pulse electric current sintering, a kind of pressure-assisted vacuum sintering, and a subsequent postsintering in air was used to fabricate sintered porous alumina compacts. During pressure-assisted vacuum sintering, a dense microstructure of the Al2O3–C system was obtained and in the second stage (i.e., during postsintering in air at different temperatures ranging from 800 to 1300 °C for more than 10 h) carbon particles present in the Al2O3–C system burned out to form a highly porous Al2O3 compact. In this work, the porosity (30%) was successfully controlled and did not change with the postsintering temperature. The intriguing aspect of this study is that porous alumina compacts are fabricated with high strength and remain stable against the postsintering temperature and extended soaking time. This behavior merits the material fabricated here as a potential porous compact, mechanically withstanding for high-temperature applications.

Type
Rapid Communications
Copyright
Copyright © Materials Research Society 2003

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