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Crystallization behavior and cordierite formation in rapidly quenched MgAl2O4–SiO2 glasses of various chemical compositions

Published online by Cambridge University Press:  31 January 2011

Kiyoshi Okada ,
Hiroshi Kawashim ,
Shigeo Hayashi ,
Mikio Sugai  and
Kenneth J. D. MacKenzie
Kiyoshi Okada*
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
Hiroshi Kawashim
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
Shigeo Hayashi
Affiliation:
Research Institute of Materials and Resources, Mining College, Akita University, Tegata-Gakuen, Akita 010, Japan
Mikio Sugai
Affiliation:
Research Institute of Materials and Resources, Mining College, Akita University, Tegata-Gakuen, Akita 010, Japan
Kenneth J. D. MacKenzie
Affiliation:
New Zealand Institute for Industrial Research and Development, Lower Hutt, New Zealand
*
a) Author to whom correspondence should be addressed.
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Abstract

Crystallization behavior of various compositions of MgAl2O4 –SiO2 glasses was investigated. Glasses with chemical compositions from MgAl2O4/SiO2 = 1/1 to 1/8, spanning the range of cordierite composition (1:2.5) were prepared by a rapid quenching method using an arc image furnace and twin roller. During thermal treatment, all the glasses first crystallized to form high-quartz solid solution (HQss), then transformed to high-cordierite at higher temperature. Transformation from high-cordierite to low-cordierite required prolonged firing times even at high temperature. The crystallization temperature of HQss and the transformation temperature from HQss to high-cordierite changed only slightly in the glasses with MgAl2O4/SiO2 ratios greater than cordierite composition, whereas large increases were found for glasses with MgAl2O4/SiO2 ratios lower than cordierite. The HQss phase appeared in the samples spanning a wide MgAl2O4/SiO2 range and showed superlattice reflections which doubled the fundamental lattice parameters. The cause for HQss formation prior to the appearance of cordierite in these glass samples is discussed from a structural viewpoint involving ordering-disordering of SiO4 and AlO4 tetrahedra deduced from 29Si and 27Al MAS-NMR spectra.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1351 - 1357
Copyright
Copyright © Materials Research Society 1998

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