Interfacial microstructure formed by reactive metal penetration of Al into mullite
- Department of Materials Science and Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 (United States)
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque , New Mexico 87106 (United States)
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{endash}metal composites by reactive metal penetration. The reactions, which have the overall stoichiometry 3Al{sub 6}Si{sub 2}O{sub 13}+(8+x)Al{r_arrow}13Al{sub 2}O{sub 3}+xAl+6Si, were carried out at temperatures of 900, 1100, and 1200&hthinsp;{degree}C for 5 and 60 min and 1400&hthinsp;{degree}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. {copyright} {ital 1999 Materials Research Society.}
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 698836
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 9 Vol. 14; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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