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Transmission electron microscopy of liquid phase densified SiC

Published online by Cambridge University Press:  31 January 2011

R.W. Carpenter ,
W. Braue  and
Raymond A. Cutler
R.W. Carpenter
Affiliation:
Center for Solid State Science, The Arizona State University, Tempe, Arizona 85287
W. Braue
Affiliation:
Center for Solid State Science, The Arizona State University, Tempe, Arizona 85287
Raymond A. Cutler
Affiliation:
Ceramatec, Inc., 2425 South 900 West, Salt Lake City, Utah 84119
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Abstract

Transmission electron microscopy was used to characterize microstructures of SiC densified using a transient liquid phase (resulting from the reaction of Al2O3 with Al4C3) by hot pressing at 1875 °C for 10 min in N2. High resolution electron microscopy showed that the SiC grain boundaries were free of glassy phases, suggesting that all liquid phases crystallized upon cooling. Phases that might be expected due to reactive sintering (i.e., AlN, Al2OC, Al2O3, Al4O4C, Al3O3N, or solid solutions of SiC, AlN, and Al2OC) were not observed. However, significant Al, Si, O, and C concentrations were found at all triple junctions of these rapidly densified ceramics.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 9 , September 1991 , pp. 1937 - 1944
Copyright
Copyright © Materials Research Society 1991

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