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Evaluation of Coatings for Sapphire Fibers in TiAl Using the Fiber Push-Out Test

Published online by Cambridge University Press:  15 February 2011

T. J. Mackin  and
J. Yang
T. J. Mackin
Affiliation:
Materials Department, The University of California at Santa Barbara, Santa Barbara, CA 93106
J. Yang
Affiliation:
Materials Department, The University of California at Santa Barbara, Santa Barbara, CA 93106
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Abstract

Fiber push-out tests were used to evaluate several double coating systems for sapphire fibers in γ -TiAl. The double coatings consisted of an inner debond coating, followed by an outer coating of alumina that serves as a diffusion barrier. The inner coatings were of three types: carbon black, colloidal graphite and porous alumina. By comparing estimates of interface toughness computed from the push-out tests, each double coating is found to permit debonding and sliding of the sapphire fibers. Consequently, each of the double coatings would afford improved fracture toughness for sapphire reinforced γ -TiAl.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 343
Copyright
Copyright © Materials Research Society 1992

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References

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