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Microanalysis of CaWO4 And ErTaO4 Coatings In Oxide Fiber Reinforced Alumina Matrix Composites

Published online by Cambridge University Press:  02 July 2020

S. T. Kim ,
V. P. Dravid ,
S. Sambasivan  and
R. W. Goettler
S. T. Kim
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208
V. P. Dravid
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208
S. Sambasivan
Affiliation:
ACTG/North western University, Evanston, IL60201
R. W. Goettler
Affiliation:
Babcock & Wilcox Co., Lynchburg, VA24506
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Extract

Ceramic matrix composites (CMC's) rely on designed weaknesses in order to provide toughening mechanisms during failure. Specifically, the fiber/matrix interface is well established as the parameter having the most influence on CMC fracture behavior, as first noted by Sambell. With proper design, this interface can allow fracture energy to dissipate by two mechanisms: an increase in crack path tortuosity and frictional energy dissipation through fiber pullout.

One design approach in the area of oxide-based CMC's which has seen considerable success recendy has been in the use of “weakly bonding” oxide coating materials placed between the fiber and the matrix phases. Such CMC systems rely on the formation of a weak interface between the fiber and the coating itself to promote the desired fracture behavior. The most notable example of such a coating material is monazite, LaPO4, as observed by Morgan et al.

Type
Spatially-Resolved Characterization of Interfaces in Materials
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 780 - 781
Copyright
Copyright © Microscopy Society of America

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References

1.R. A. J., Sambell et al., Journal of Material Science 7(1972)663.Google Scholar
2.Morgan, P. E. D. et al., Materials Science and Engineering A 195(1995)215.CrossRefGoogle Scholar
3.Morgan, P. E. D. et al., Journal of the American Ceramic Society 78(1995)1553.CrossRefGoogle Scholar
4.Goettler, R. W. et al., Ceramic Engineering and Science Proceedings 18(1997)279.CrossRefGoogle Scholar