Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1883-C7-1888
Thermal fatigue of fibrous ceramic matrix compositesM.L. BOUCHETOU, M. HUGER and C. GAULT
Laboratoire Matériaux Céramiques et Traitements de Surface, URA 320 du CNRS, Ecole Nationale Supérieure de Céramique Industrielle, 47 à 73 Avenue Albert Thomas, 87065 Limoges, France
This paper is devoted to the study of 2D SiC/C/SiC composites which are subjected to thermal cycling. Previous work has already shown that variation in Young's modulus can be used to monitor damage in ceramic-ceramic composites. Samples were rapidly heated by moving them up into a tubular furnace and rapidly cooled by moving them down through a gas flow, which can be either air or Ar-H2. After each thermal cycle, the uniaxial Young's modulus was measured by an ultrasonic method. The results show that a regular decrease of Young's modulus is observed in air up to 100 cycles, though it remains constant in Ar-H2. In comparison to isothermal ageing, the effects of thermal cycling on oxidation mechanisms are discussed.
© EDP Sciences 1993