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Interfacial Fracture Between Boron Nitride And Silicon Nitride And Its Applications To The Failure Behavior Of Fibrous Monolithic Ceramics

Published online by Cambridge University Press:  15 February 2011

D. Kovar ,
G.A. Brady ,
M.D. Thouless  and
J.W. Halloran
D. Kovar
Affiliation:
Materials Science and Engineering Dept.
G.A. Brady
Affiliation:
Materials Science and Engineering Dept.
M.D. Thouless
Affiliation:
Mechanical Engineering and Applied Mechanics Dept., University of Michigan, Ann Arbor, MI 48109–2136
J.W. Halloran
Affiliation:
Materials Science and Engineering Dept.
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Abstract

Mechanical tests show that fibrous monolithic ceramics can exhibit graceful failure in bending due to marked crack deflection at silicon nitride/boron nitride interfaces. Model sandwich specimens were manufactured from polycrystalline silicon nitride with interphases consisting of mixtures of silicon nitride and boron nitride. The interfacial fracture resistances of the specimens were measured, and the results were correlated to the failure behavior of fibrous monolithic ceramics. It was found that the three modes of failure observed in fibrous monoliths can be correlated with the interfacial fracture resistance. In addition, anisotropy in the properties of the interphases were found to have a profound influence on crack deflection.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 243
Copyright
Copyright © Materials Research Society 1996

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References

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