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Application of chemical vapor deposited yttria for the protection of silicon carbide fibers in a SiC/Ni3Al compositea)

Published online by Cambridge University Press:  31 January 2011

D. J. Larkin ,
L. V. Interrante  and
A. Bose
D. J. Larkin
Affiliation:
Department of Chemistry, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
L. V. Interrante
Affiliation:
Department of Chemistry, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
A. Bose*
Affiliation:
Department of Materials Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
*
b)Currently at the Southwest Research Institute.
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Abstract

A CVD process has been developed for coating Textron-Avco SCS-6 SiC fiber with yttria. Both Y(fod)3·H2O and Y(thd)3 (fod = 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato; thd = 2,2,6,6-tetramethyl-3,5-heptanedionato) were examined as potential Y2O3 CVD precursors. Analysis of the deposits by Auger spectroscopy indicated significant F and C'incorporation in the case of Y(fod)3 · H2O whereas, under appropriate conditions, Y(thd)3 gave a deposit which was essentially free of C and other impurities. GCFTIR analysis of the volatile products of the CVD process indicated isobutylene, tetrafluoroethylene, 1,1-difluoroethylene, fluoroform, and fluoroethylene for Y(fod)3 · H2O and mainly isobutylene and propylene for Y(thd)3. The precursor Y(thd)3 was chosen to deposit 1–2 μm of yttria on short lengths of silicon carbide fibers. The coated fibers were then incorporated into a nickel aluminide (Ni3Al) matrix by reactive sintering, with yttria affording protection from the known SiC + 2Ni ⇉ Ni2Si + C degradation process. The SiC/Ni3Al composites, before and after annealing at 1000 °C for up to 100 h, were studied by using SEM and EMPA to determine the extent of reaction. With the exception of certain portions of the fibers that were inadequately coated with yttria, complete protection of the fibers was indicated.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 11 , November 1990 , pp. 2706 - 2717
Copyright
Copyright © Materials Research Society 1990

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Footnotes

a)

Presented at the 14th Annual Conference on Composite Materials and Structures, American Ceramic Society Closed Sessions (January 1990), Cocoa Beach, Florida.

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