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Microstructure of Polycrystalline MgO Penetrated by a Silicate Liquid

Published online by Cambridge University Press:  08 August 2003

Sundar Ramamurthy ,
Michael P. Mallamaci ,
Catherine M. Zimmerman ,
C. Barry Carter ,
Peter R. Duncombe  and
Thomas M. Shaw
Sundar Ramamurthy
Affiliation:
Department of Chemical Engineering and Materials Science, Amundson Hall, University of Minnesota, Minneapolis, MN 55455 E-mail: sundar@cems.umn.edu
Michael P. Mallamaci
Affiliation:
Department of Chemical Engineering and Materials Science, Amundson Hall, University of Minnesota, Minneapolis, MN 55455
Catherine M. Zimmerman
Affiliation:
Department of Chemical Engineering and Materials Science, Amundson Hall, University of Minnesota, Minneapolis, MN 55455
C. Barry Carter
Affiliation:
Department of Chemical Engineering and Materials Science, Amundson Hall, University of Minnesota, Minneapolis, MN 55455
Peter R. Duncombe
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY 10598
Thomas M. Shaw
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY 10598
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Abstract

Dense, polycrystalline MgO was infiltrated with monticellite (CaMgSiO4) liquid to study the penetration of liquid along the grain boundaries of MgO. Grain growth was found to be restricted with increasing amounts of liquid. The inter-granular regions were generally found to be comprised of a two-phase mixture: crystalline monticellite and a glassy phase rich in the impurities present in the starting MgO material. MgO grains act as seeding agents for the crystallization of monticellite. The location and composition of the glassy phase with respect to the MgO grains emphasizes the role of intergranular liquid during the devitrification process in “snowplowing” impurities present in the matrix.

Keywords

Microstructureliquid-phase sinteringinfiltrationmagnesium oxidecrystallization
Type
Research Article
Information
Microscopy and Microanalysis , Volume 2 , Issue 3 , June 1996 , pp. 113 - 128
Copyright
© 1996 Microscopy Society of America

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