Preparation and characterization of 2D SiC/SiC composites with composition-graded C(B) interphase
| Autor: | Francis Langlais, Alain Guette, S. Goujard, Sylvain Jacques, Roger Naslain |
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| Přispěvatelé: | Laboratoire des Composites Thermostructuraux (LCTS), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Snecma-SAFRAN group-Centre National de la Recherche Scientifique (CNRS), Société Européenne de Propulsion, SEP |
| Rok vydání: | 1997 |
| Předmět: |
Materials science
Nanoporous chemistry.chemical_element Characterization (materials science) stomatognathic system chemistry Short lifetime Materials Chemistry Ceramics and Composites [CHIM]Chemical Sciences Composition (visual arts) Interphase Texture (crystalline) Composite material Boron Oxidation resistance |
| Zdroj: | Journal of the European Ceramic Society Journal of the European Ceramic Society, 1997, 17 (9), pp.1083-1092. ⟨10.1016/S0955-2219(96)00216-6⟩ |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/s0955-2219(96)00216-6 |
| Popis: | International audience; 2D SiC/C(B)/SiC composites were prepared by CVI. The C(B) interphase is made of five successive C(B) layers with increasing boron content from the fibre to the matrix. This composition-graded interphase leads to good mechanical properties similar to those obtained with pure pyrocarbon interphase. However, the lifetime in air under load at high temperature of 2D SiC/C(B)/SiC composites is not improved despite the high percentage of boron in several sublayers of the interphase. By TEM characterization, the boron-rich layers were found to exhibit a nano-porous texture probably due to a bad control of the growth process within the fibrous preforms. This nanoporous texture might be responsible for the poor oxidation resistance of these sublayers and consequently the rather short lifetime of the real 2D composites with respect to those previously reported for 1D SiC/C(B)/SiC model microcomposites. |
| Databáze: | OpenAIRE |
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