A model SiC-based fibre with a low oxygen content prepared from a polycarbosilane precursor

A model SiC-fibre has been prepared from a polycarbosilane precursor by means of an irradiation oxygen-free curing process. The chemical composition remains unchanged after heat treatments under an inert atmosphere for pyrolysis temperatures of 1600°C. At this temperature, the fibre consists of SiC...

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Bibliographic Details
Published in:Journal of materials science 1997, Vol.32 (4), p.893-911
Main Authors: CHOLLON, G, CZERNIAK, M, PAILLER, R, BOURRAT, X, NASLAIN, R, PILLOT, J. P, CANNET, R
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Carbon
Ceramic and carbon fibers
Ceramic industries
Chemical composition
Chemical industry and chemicals
Electrical resistivity
Exact sciences and technology
Filaments
Grain boundaries
Grain growth
Inert atmospheres
Materials science
Nanocrystals
Organic chemistry
Oxidation
Oxygen content
Precursors
Pyrolysis
Reaction kinetics
Technical ceramics
Temperature
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Summary:A model SiC-fibre has been prepared from a polycarbosilane precursor by means of an irradiation oxygen-free curing process. The chemical composition remains unchanged after heat treatments under an inert atmosphere for pyrolysis temperatures of 1600°C. At this temperature, the fibre consists of SiC nanocrystals (mean size 6–10 nm) and free carbon. However, a slow grain growth takes place as the temperature is increased. The fibre retains a high strength at room and high temperatures up to temperatures of 1600 °C when the pyrolysis has been performed under nitrogen. The electrical conductivity was studied as a function of the pyrolysis temperature Tp: For 1100≤Tp≤1200 °C, the conductivity increases by several orders of magnitude due to the reorganization of the free carbon phase at the SiC grain boundaries. Oxidation kinetics of the filaments remain parabolic from 1000–1400 °C.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1018597432067