Abstract
This paper gives an overview on the creep behavior and mechanism of some CMCs, with a SiC ceramic matrix, such as Cf-SiC, SiCf-SiC and SiCf-SiBC. Tensile creep tests were conducted under argon and air in order to have the influence of the environmental conditions on the macroscopical mechanical response. Nevertheless, multi-scale and multi-technique approaches were required to identify and quantify mechanism(s) which is (are) involved in the creep behavior. The initiation and propagation of damages which are occurring under high stress and temperature conditions were investigated at mesoscopic, microscopic and nanoscopic scales using SEM, TEM and HREM, in order to identify the mechanism(s) involved at each scale. Automatic image analysis was used in order to quantify the evolution of some damage morphological parameters. The macroscopical creep behavior has been investigated through a damage mechanics approach which seems to be the most promising route. A good correlation was found between the kinetics of the damage mechanisms and the creep behavior. For such ceramic matrix composites, the governing mechanism is a damage-creep one, with an additional delay effect due to formation of a glass when tests are performed under air.
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This paper is dedicated to Drs Roger W. Davidge (Great-Britain, † Aug. 1997), Junn Nakayama (Japan, † Dec. 1991) and Reiner Pabst (Germany, † July 1986).
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Chermant, JL., Farizy, G., Boitier, G., Darzens, S., Vicens, J., Sangleboeuf, JC. (2005). Creep Behavior and Mechanism for CMCs with Continuous Ceramic Fibers. In: Bradt, R.C., Munz, D., Sakai, M., White, K.W. (eds) Fracture Mechanics of Ceramics. Fracture Mechanics of Ceramics, vol 14. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-28920-5_16
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DOI: https://doi.org/10.1007/978-0-387-28920-5_16
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