Hot-corrosion of refractory high-entropy ceramic matrix composites synthesized by alloy melt-infiltration
| Autor: | Keishi Nishio, Yutaro Arai, M. Saito, Yasuo Kogo, Ryo Inoue, A. Samizo |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Process Chemistry and Technology Alloy Composite number Oxide chemistry.chemical_element Atmospheric temperature range engineering.material Ceramic matrix composite Surfaces Coatings and Films Electronic Optical and Magnetic Materials Carbide Corrosion chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Ceramics and Composites engineering Carbon |
| Zdroj: | Ceramics International. 47:31740-31748 |
| ISSN: | 0272-8842 |
| Popis: | Carbon fiber-containing refractory high-entropy ceramic matrix composites (C/RHECs) were fabricated through a reaction with carbon powders, transition metal carbides, and Zr–Ti alloys as a novel heat resistant material used for components of hypersonic vehicles cruising at Mach 7–10. With the infiltration of alloys at 1750 °C into a composite preform containing carbon and carbide powders for 15 min, a high-entropy matrix was successfully formed in situ. Arc-jet tests were conducted in the temperature range of 1800–1900 °C. Results showed the formation of an oxidized region composed of complex oxides, such as (Zr, Hf)O2, (Nb, Ta)2(Zr, Hf)6O17, (Zr, Hf)TiO4, and Ti(Nb, Ta)2O7, with an average thickness of ~600 μm, under which an unoxidized region remained. The porous oxidized region resulted from the evolution of CO(g) during oxidation, while a dense oxide region formed as the outermost region. This indicates that the dense oxide region acted as a barrier to oxygen diffusion for the unoxidized region during oxidation. |
| Databáze: | OpenAIRE |
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