Influence of Y2O3 addition on the mechanical and oxidation behaviour of carbon fibre reinforced ZrB2/SiC composites |
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| Affiliation: | 1. DMAS, ONERA, Université Paris-Saclay, F-92322 Châtillon, France;2. DPHY, ONERA, Université Paris-Saclay, F-91123 Palaiseau, France;1. School of Materials, Sun Yat-sen University, Guangzhou, 510275, China;2. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, China;3. The Key Laboratory of Fluid and Matter Interaction, University of Science and Technology Beijing, Beijing, 100083, China;4. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China;5. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, China;1. Airbus Defence and Space GmbH, 82024 Taufkirchen, Germany;2. Airbus Safran Launchers GmbH, 82024 Taufkirchen, Germany;3. Politecnico di Torino, 10129 Turin, Italy |
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| Abstract: | The influence of Y2O3 addition on the microstructure, thermo-mechanical properties and oxidation resistance of carbon fibre reinforced ZrB2/SiC composites was investigated. Y2O3 reacted with oxide impurities present on the surface of ZrB2 and SiC grains and formed a liquid phase, effectively lowering the sintering temperature and allowing to reach full density at 1900 °C. The presence of a carbon source (fibres) led to additional reactions which resulted in the formation of new secondary phases such as yttrium boro-carbides. Mechanical properties were significantly enhanced compared to the un-doped composite. Further tests at high temperatures resulted in strength increase up to 700 MPa at 1500 °C which was attributed to stress relaxation. Oxidation tests carried out at 1500 °C and 1650 °C in air showed that the presence of the Y-based secondary phases enhanced the growth of ZrO2 grains, but offered limited protection to oxygen due to the lower availability of surficial SiO2 formed from SiC. |
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| Keywords: | Ceramic-Matrix Composites (CMCs) Ultra-High-Temperature-Ceramics (UHTCs) Fibre-matrix interface Rare earths Oxidation resistance |
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