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Ductile Phase Toughening of MoSi2-Chemical Compatibility and Fracture Toughness

Published online by Cambridge University Press:  21 February 2011

L. Xiao ,
Y. S. Kim  and
Reza Abbaschian
L. Xiao
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611
Y. S. Kim
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611
Reza Abbaschian
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611
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Abstract

Chemical compatibility between oxide coated Nb filament reinforcements and MoSi2 was investigated. It was determined that ZrO2, Al2O3, and mullite coatings were chemically compatible with both Nb and MoSi2. Comparison between coated and uncoated filaments indicated that the coatings reduced the thickness of the interaction zone. The fracture toughness of the Nb filament reinforced composites showed an increase, while W filament reinforced composite showed a decrease, in the toughness compared to that of the matrix. The results are discussed in terms of the mismatches in the coefficients of thermal expansion and the bonding characteristics of the reinforcement/matrix interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 399
Copyright
Copyright © Materials Research Society 1990

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