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Effects of the scale of precursor mixing on densification behaviors and phase-transformation kinetics of cordierite gels

Published online by Cambridge University Press:  03 March 2011

Hyun M. Jang  and
Byung C. Lim
Hyun M. Jang*
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
Byung C. Lim
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
*
a)Author to whom correspondence should be addressed.
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Abstract

Effects of the scale of precursor mixing on densification behaviors and phase-transformation kinetics of multicomponent aluminosilicate gels were examined using cordierite gels prepared by two different processing routes: a monophasic (single phase) gel having molecular homogeneity, and a triphasic gel in which constitutive precursor phases are uniformly mixed in a nanometer scale (∼50 nm). In the case of the monophasic cordierite gel, homogeneous molecular-scale mixing of precursors induces a direction formation of μ-cordierite without a preceding crystallization, and the densification stops at the onset of crystallization to μ-cordierite at 960 °C. On the other hand, the densification of triphasic cordierite gel was not affected by the crystallization of intermediate spinel phase at 700 °C. The triphasic gel continues to densify until amorphous silica matrix crystallizes to quartz at 1180 °C. The enhanced densification observed in the triphasic gel was attributed to the retarded crystallization of amorphous silica component caused by the increase in diffusion distances.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2627 - 2633
Copyright
Copyright © Materials Research Society 1994

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References

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