MOCAER, D.; CHOLLON, Georges; PAILLER, Rene; FILIPUZZI, L.; NASLAIN, Roger

doi:10.1007/BF00354712

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

MOCAER, D.
Laboratoire des Composites Thermostructuraux [LCTS]

CHOLLON, Georges

Laboratoire des Composites Thermostructuraux [LCTS]

PAILLER, Rene
Laboratoire des Composites Thermostructuraux [LCTS]

Langue

Article de revue

Ce document a été publié dans

Journal of Materials Science. 1993-06-01, vol. 28, n° 11, p. 3059-3068

Résumé en anglais

Oxidation tests have been performed on model Si-C-N-O filaments prepared from a new polycarbosilazane (PCSZ) precursor, according to a spinning-oxygen-curing-pyrolysis procedure. Thermogravimetric analyses have been run under a flowing atmosphere of dry oxygen (P=100 kPa) at 1000 < T < 1400 °C. The oxidation treatment results in the growth of a silica layer (passive oxidation regime) and simultaneously the release of carbon oxides and nitrogen, with an overall weight increase. At a given test temperature, the kinetics of growth of the silica scale obeys a parabolic law. The parabolic rate constant is thermally activated with an apparent activation energy of 170 kJ mol−1. The rate-limiting step is diffusion-controlled. The ex-PCSZ filaments exhibit a better oxidation resistance than the related Si-C-O fibres prepared from polycarbosilane precursors according to a similar procedure.< Réduire

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Si-C-N ceramics with a high microstructural stability elaborated from the pyrolysis of new polycarbosilazane precursors

Langue

Ce document a été publié dans

Résumé en anglais

URI

DOI

Unités de recherche