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Interfacial microstructure formed by reactive metal penetration of Al into mullite

Published online by Cambridge University Press:  31 January 2011

P. Lu ,
T. B. Du ,
R. E. Loehman ,
K. G. Ewsuk  and
W. G. Fahrenholtz
P. Lu
Affiliation:
Department of Materials Science and Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801
T. B. Du
Affiliation:
Department of Materials Science and Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801
R. E. Loehman
Affiliation:
Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque New Mexico 87106
K. G. Ewsuk
Affiliation:
Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque New Mexico 87106
W. G. Fahrenholtz
Affiliation:
Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque New Mexico 87106
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Abstract

Microstructures in the reaction interface between molten Al and dense mullite have been studied by transmission electron microscopy to provide insight into mechanisms for forming ceramic–metal composites by reactive metal penetration. The reactions, which have the overall stoichiometry 3Al6Si2O13 + (8 + x)Al → 13Al2O3 + xAl + 6Si, were carried out at temperatures of 900, 1100, and 1200 °C for 5 and 60 min and 1400 °C for 15 min. Observed phases generally were those given in the above reaction; their proportions and interfacial microstructures, however, were strongly dependent on the reaction temperature. Using previously measured reaction kinetics data, the observed temperature dependence of the interfacial microstructure has been modeled as three sequential steps, each of which is rate limiting in a different temperature range.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3530 - 3537
Copyright
Copyright © Materials Research Society 1999

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References

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