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Effect of high temperature heat treatment on the microstructure and mechanical properties of third generation SiC fibers

Published online by Cambridge University Press:  20 March 2013

Dominique Gosset ,
Aurélien Jankowiak ,
Thierry Vandenberghe ,
Maud Maxel ,
Christian Colin ,
Nicolas Lochet  and
Laurence Luneville
Dominique Gosset
Affiliation:
CEA-Saclay, DMN-SRMA-LA2M, LRC CARMEN, 91191 Gif/Yvette, France
Aurélien Jankowiak
Affiliation:
CEA-Saclay, DMN-SRMA-LC2M, 91191 Gif/Yvette, France
Thierry Vandenberghe
Affiliation:
CEA-Saclay, DMN-SRMA-LA2M, 91191 Gif/Yvette, France
Maud Maxel
Affiliation:
CEA-Saclay, DMN-SRMA-LC2M, 91191 Gif/Yvette, France
Christian Colin
Affiliation:
CEA-Cadarache, DER-SRJH-LEDI, 13108 St Paul-lès-Durance, France
Nicolas Lochet
Affiliation:
CEA-Saclay, DMN-SRMA-LTMEX, 91191 Gif/Yvette, France
Laurence Luneville
Affiliation:
CEA-Saclay, DM2S-SERMA-LLPR, LRC CARMEN, 91191 Gif/Yvette, France
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Abstract

SiC fibers (High Nicalon S -HNS and Tyranno SA3 -Ty-SA3) submitted to heat treatments in neutral atmosphere up to 1900°C were studied by X-ray diffraction (XRD) and TEM observations then submitted to tensile tests up to 1800°C. The microstructural changes in both materials were determined by XRD using a modified Hall-Williamson method introducing an anisotropy parameter taking into account the high density of planar defects of the SiC-3C structure. HNS fibers exhibit significant modifications in the CDD size which drastically increases from 24 nm to 70 nm in the range 1600°C to 1800°C and in the microstrains which decrease from 0.0015 to 0.0005 between 1750°C to 1850°C. Concerning the Ty-SA3 fibers, no evolution of CDD size and microstrains has been observed. The mechanical properties of single fibers were investigated after the heat treatments showing decreases in the tensile strength reaching up to 20% for Tyranno SA3 and 50% for High Nicalon S. The Weibull moduli were also significantly affected. These results are correlated to the fiber structural and microstructural evolutions.

Keywords

fiberx-ray diffraction (XRD)fracture
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1514: Symposium HH – Advances in Materials for Nuclear Energy , 2013 , pp. 131 - 137
Copyright
Copyright © Materials Research Society 2013 

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References

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