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Two kinds of roles of MgO in the densification and grain growth of alumina under various atmospheres: Sensitive and insensitive roles to the experimental procedures

Published online by Cambridge University Press:  31 January 2011

Takayasu Ikegami  and
Katsuya Eguchi
Takayasu Ikegami
Affiliation:
National Institute for Research in Inorganic Materials 1-1, Namiki, Tsukuba-shi, Ibaraki, 305 Japan
Katsuya Eguchi
Affiliation:
Dow Corning Asia Ltd., Research Center, 603, Kishi, Yamakita-machi Ashigarakami-gun, Kanagawa 258-01 Japan
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Abstract

Two kinds of high-purity Al2O3 powder were studied with respect to the effects of not only MgO doping but also atmosphere on both densification and grain growth. Controversial results for MgO doping are explained in terms of two roles that MgO can play during these processes: sensitive and insensitive to the experimental procedures. Atmospheres, whether dry or wet, had little influence on densification or grain growth in the early stage. After closed pores appreciably formed, however, both N2 and Ar atmospheres quickly reduced the densification rate.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 509 - 517
Copyright
Copyright © Materials Research Society 1999

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