Thermomechanical stability of Nicalon fibres in a carbon monoxide environment

Microstructural changes and the related strength degradation were investigated for the Nicalon ceramic fibre heat-treated in argon and in a CO Ar mixture (with a CO partial pressure of 40 kPa) at 1200–1400 °C and for different periods of time (0.5–30 h). Detailed structural and compositional analyse...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 1995, Vol.15 (10), p.997-1006
Main Authors: Bodet, R., Jia, N., Tressler, R.E.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic and carbon fibers
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Technical ceramics
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Summary:Microstructural changes and the related strength degradation were investigated for the Nicalon ceramic fibre heat-treated in argon and in a CO Ar mixture (with a CO partial pressure of 40 kPa) at 1200–1400 °C and for different periods of time (0.5–30 h). Detailed structural and compositional analyses were carried out using X-ray diffraction, TEM, SEM, and Auger electron spectroscopy. Strength degradation of the Nicalon fibre after heat-treatments in argon resulted from the fibre decomposition and CO gas escape which produced surface defects, grain growth and intergranular porosity. On the other hand, the strength degradation was effectively reduced for fibres heat-treated in an appropriate atmosphere of argon and CO, as long as the heat-treatment temperature was kept below 1400 °C. Such conditions of heat-treatment in CO Ar showed little effect on the grain size.
ISSN:0955-2219
1873-619X
DOI:10.1016/0955-2219(95)00074-5