:: Advanced Composites Letters on-line ABSTRACTS ::

Volume 8, Issue 6, 1999
Thermomechanical Behaviour Of 2D-SiC/SiC Composites with Nanoscale-Multilayered (PyC/SiC)n InterphaseS

S. Bertrand, F. Germain, R. Pailler and J. Lamon

Laboratoire des Composites Thermostructuraux (UMR 5801 CNRS-SEP/SNECMA-UB1 CEA), Université de Bordeaux 1, 3 Allée de la Boétie, 33 600 Pessac, France

(Received 8/99;accepted 11/99)
ABSTRACT

2D woven SiC/SiC composites, with nanoscale-multilayered (PyC/SiC)n interphases, have been made via chemical vapour infiltration of a preform of either Nicalon or Hi-Nicalon fibres. The nanoscale-multilayered (PyC/SiC)n interphases consist of n successive PyC-SiC sequences. In the present paper n = 10 and the thickness of the PyC and SiC sublayers was about 20 nm and 50 nm respectively. The influence of Hi-Nicalon fibres and multilayered interphases on the mechanical behaviour at room temperature and the lifetime in cyclic fatigue at 600°C and 1200°C was investigated. The Hi-Nicalon fibre and the multilayered interphases are shown to lead to improved 2D-SiC/SiC composites.

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