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Interface Degradation in CAS/Nicalon During Elevated Temperature Aging

Published online by Cambridge University Press:  15 February 2011

Kevin P. Plucknett ,
Rebecca L. Cain  and
M.H. Lewis
Kevin P. Plucknett
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6068
Rebecca L. Cain
Affiliation:
Centre for Advanced Materials Technology, University of Warwick, Coventry, CV4 7AL, U.K.
M.H. Lewis
Affiliation:
Centre for Advanced Materials Technology, University of Warwick, Coventry, CV4 7AL, U.K.
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Abstract

A CaO-Al203-SiO2 (CAS)/Nicalon glass-ceramic matrix composite has been subjected to elevated temperature oxidation heat-treatments between 375 and 1200°C, for up to 100 hours. Micro- and macro-mechanical properties have been determined by fiber push-down, using a mechanical properties microprobe, and flexure testing, respectively. Aging between 450 and 800°C results in significant property degradation, with reduced bending modulus and flexure strength, increased fiber sliding stress, and a transition to a purely brittle failure mode. Aging degradation is due to oxidative removal of the carbon interlayer, with the subsequent formation of a silica bond between fiber and matrix. At higher temperatures, carbon is retained due to the formation of a protective silica plug at exposed fiber ends, with the subsequent retention of composite properties. Short duration pre-treatment schedules, at 1000 or 1100°C, were developed to prevent intermediate temperature property degradation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 421
Copyright
Copyright © Materials Research Society 1995

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