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Sol-gel Elaboration of Porous Oxide Coatings as Interphase in SiC/SiC Ceramic Matrix Composites

Published online by Cambridge University Press:  10 February 2011

M. Verdenelli ,
S. Parola ,
F. Chassagneux ,
S. Jacques ,
H. Vincent ,
J. Dazord ,
J.P. Scharff  and
E. Bourgeat-Lami
M. Verdenelli
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
S. Parola
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
F. Chassagneux
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
S. Jacques
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
H. Vincent
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
J. Dazord
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
J.P. Scharff
Affiliation:
Laboratoire des Multimatériaux et Interfaces UMR CNRS 5615 Université Claude Bernard Lyon 1 – 69622 Villeurbanne cedex, France. E-mail: Stephane.Parola@univ-lyon1.fr
E. Bourgeat-Lami
Affiliation:
Laboratoire de Chimie et Procédés de Polymérisation UMR 140, ESCPE, Villeurbanne, France.
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Abstract

Combinations of meso-, macro- and microporous coatings with a chemical composition of 90%Al2O3-10%SiO2 were elaborated on SiC Hi-Nicalon fibers using the sol-gel process. They were evaluated as porous interphase for the reinforcement of CMC. The mesoporous oxide, in contact with the fiber, allows cracks deviation whereas the macroporous one, in contact with the matrix, avoids the gaseous infiltration of the mesopores during the SiC CVD matrix process. It also prevents from oxygen diffusion during high temperature under air. The characterization of the composites was performed by SEM (scanning electron microscopy), TEM (transmission electron microscopy), X-ray diffraction, and EDS (energy dispersive spectrometry). TEM evidenced the porosity gradient as expected. A tensile test on the composites revealed brittle behavior (fracture) and no fiber debonding was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 775: Symposium P – Self-Assembled Nanostructured Materials , 2003 , P3.24
Copyright
Copyright © Materials Research Society 2003

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