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High-Temperature Flow of SiC Continuous Fiber-Glass Ceramic Matrix Composites: The Effect of Interface/Interphase Ductility

Published online by Cambridge University Press:  15 February 2011

B.G. Nair ,
R.F. Cooper ,
J.N. Almquist  and
M.E. Plesha
B.G. Nair
Affiliation:
University of Wisconsin-Madison, Department of Materials Science and Engineering, 1509 University Avenue, Madison, WI 53706
R.F. Cooper
Affiliation:
University of Wisconsin-Madison, Department of Materials Science and Engineering, 1509 University Avenue, Madison, WI 53706
J.N. Almquist
Affiliation:
University of Wisconsin-Madison, Department of Engineering Mechanics and Astronautics, 1415 Johnson Drive, Madison, WI 53706
M.E. Plesha
Affiliation:
University of Wisconsin-Madison, Department of Engineering Mechanics and Astronautics, 1415 Johnson Drive, Madison, WI 53706
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Abstract

The elevated temperature rheology of continuous SiC (Nicalon®) calcium aluminosilicate glass-ceramic matrix composites is evaluated in uniaxial compression creep experiments (-σ1 = 20-to-40 MPa; T = 1300–1320°C). The steady state strain rate is demonstrated.to be highly sensitive to the orientation of the reinforcement relative to the maximum compressional stress, with highest bulk specimen strain rates noted for conditions in vWhich the sliding between the fiber and the matrix is optimized as a kinetic flow response (i.e., a fiber orientation of approximately 40-50° from σ1). One further discovers that the temperature sensitivity (i.e., activation energy) of flow increases as the amount of interface flow/sliding increases. The experimental results suggest that the high-temperature, low-stress interface response in this composite system is related to the ductile flow of the “Planar” SiO2 reaction-layer interphase that exists (in addition to the well-recognized planar carbon interphase) in these materials. The results of these simple experiments are used to calibrate a microscale-to-macroscale rheologic model in which the fibermatrix interface is described by a viscous constitutive relationship.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 469
Copyright
Copyright © Materials Research Society 1995

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