Oxidation resistance of highly porous CVD-SiC coated Tyranno fiber composites

Oxidation tests have been carried out on highly porous ceramic matrix fiber composites consisting of Tyranno Lox M fibers coated with Pyro C and CVD-SiC thin layers. TGA experiments carried out at 900 °C confirm that mass loss rates are higher for materials with thicker Pyro C layers. At higher temp...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2011-06, Vol.31 (6), p.1155-1164
Main Authors: Cocera, N., Esparza, N. Remirez de, Ocaña, I., Sanchez, J.M.
Format: Article
Language:English
Subjects:
Ceramics
Coatings
CVD-SiC
Fibers
Fibres
Oxidation
Oxidation resistance
Porous composites
Reaction kinetics
Silicon carbide
Tyranno fibers
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Summary:Oxidation tests have been carried out on highly porous ceramic matrix fiber composites consisting of Tyranno Lox M fibers coated with Pyro C and CVD-SiC thin layers. TGA experiments carried out at 900 °C confirm that mass loss rates are higher for materials with thicker Pyro C layers. At higher temperatures (i.e. 1250 °C) such differences are not significant likely due to the interaction between SiC oxidation and Pyro C burnout. These tests clearly show that the oxidation kinetics of Tyranno fibers are much faster than those of CVD-SiC coatings. Therefore, the CVD-SiC coatings protect the Tyranno fibers against oxidation, although this is less effective as the thickness of the Pyro C layer increases. Finally, it has been found that the oxidation kinetics of the CVD-SiC layers are faster as the coating thickness increases and are different for the inner and the outer coating surfaces.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.12.024