Abstract
The concept of ceramic matrix composites was proposed in the eighties to be used in the aeronautical and space domains. Classical SiCf-SiC have changed into complex materials, such as SiCf-SiBC investigated in this work: that composite is reinforced with SiC Hi-Nicalon fibers and has a multi-layer and self-sealing matrix. This matrix has been fabricated by means of several chemical vapor infiltrations with different compositions. Prior to the matrix infiltration, a pyrocarbon interphase has been deposited on the fibrous preform. The self-sealing property of this composite is due to the presence of boron in certain matrix layers, which will react with the atmosphere and particularly oxygen, to create a sealant glass, which protects pyrocarbon and SiC fibers.
Tensile creep behavior of this material was investigated in the 1373–1573 K temperature range, under stresses varying from 130 to 200 MPa, under oxidizing atmosphere. Unloading-reloading loops have permitted to follow the evolution of the damage parameter defined by Kachanov and Rabotnov. Microscopical analysis by means of scanning and transmission electron microscopies have shown microstructural modifications and damage creation in the crept materials. Creep results obtained under air have been compared to similar results under argon: it has been possible to determine the influence of oxygen (which corresponds to real environment for their use), and the efficiency of the sealant glass.
This work has then permitted to determine the creep mechanisms(s) involved in this composite and to precise the influence of oxidizing atmosphere on the mechanical behavior.
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Farizy, G., Chermant, JL., Vicens, J., Sangleboeuf, JC. (2005). Creep Investigation of SiCf-SiBC Composites. 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_21
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DOI: https://doi.org/10.1007/978-0-387-28920-5_21
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