Thermal degradation mechanisms of Nicalon fibre : a thermodynamic simulation

Thermodynamic calculations for the thermal degradation of the Nicalon fibre in inert gas flow at atmospheric pressure were performed, based on minimisation of the Gibbs energy of the Si-C-O-H chemical system. The calculations are based on a critically selected thermodynamic database of the participa...

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Bibliographic Details
Published inJournal of materials science Vol. 29; no. 22; pp. 5839 - 5846
Main Authors VAHLAS, C, ROCABOIS, P, BERNARD, C
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 15.11.1994
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic and carbon fibers
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Technical ceramics
Silicon Carbides
Thermodynamic model
Simulation
Reaction mechanism
Carbides oxides
Thermal degradation
Ceramic fiber
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Summary:Thermodynamic calculations for the thermal degradation of the Nicalon fibre in inert gas flow at atmospheric pressure were performed, based on minimisation of the Gibbs energy of the Si-C-O-H chemical system. The calculations are based on a critically selected thermodynamic database of the participating compounds. The results are presented by means of diagrams illustrating the quantities of condensed and gaseous species obtained as a function of treatment temperature. These are compared with recently reported TEM studies of as-received and heat-treated material, which illustrate the sequential morphologies of its structure and nanotexture as a function of treatment temperature. The main step of the observed degradation mechanism is successfully simulated in terms of the temperature, the oxygen content and the weight loss of the material. An endogenous oxidation mechanism is proposed for degradation of the fibre. 31 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00366865