Innovative sintering process for fabrication of thermochromic smooth VO2 ceramics
| Autor: | Aline Rougier, Anthony Chiron, Nicolas Penin, Manuel Gaudon, U. Chan Chung, Oudomsack Viraphong, Jean-Louis Victor |
|---|---|
| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Materials science
Annealing (metallurgy) Sintering Induction furnace 02 engineering and technology Surface finish 010402 general chemistry 01 natural sciences Crystallinity smooth ceramic Materials Chemistry Ceramic Composite material sintering process Mechanical Engineering Metals and Alloys Vanadium dioxide [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid Grain growth Mechanics of Materials visual_art visual_art.visual_art_medium 0210 nano-technology human activities large-scale powder synthesis thermochromic behaviour |
| Zdroj: | Journal of Alloys and Compounds Journal of Alloys and Compounds, Elsevier, 2022, 890, 161890 (9 p.). ⟨10.1016/j.jallcom.2021.161890⟩ |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.161890⟩ |
| Popis: | International audience; In this paper, a pyrolysis method is used to synthesize high quality VO2 powder. Black carbon and V2O5 powder are mixed and annealed at 650 °C or 800 °C under argon flow to initiate a carbo-reduction reaction. The 650 °C VO2 powder presents submicron particle size with an amorphous fraction estimated at 11.5%. With the increase of the annealing temperature up to 800 °C, grains become larger than the micron while the crystallinity goes up to 98.5% (i.e. amorphous fraction drops to 1.5%). This one-step process allows the preparation of quantities up to 10 g of VO2 powder and should be easily transferable to large-scale production. An innovative sintering process is then adopted to produce high quality thermochromic VO2 ceramics from the as-prepared VO2 powder. First, SPS process is used to obtain high-density VO2 pellet. Then, the VO2 pellet is post-annealed in a homemade induction furnace at 1300 °C under a controlled atmosphere to allow grain growth by coalescence and improve pellet surface quality. According to a surface topography analysis, the mean amplitude roughness parameter (Ra) of the obtained VO2 ceramic is found to be 2.93 ± 0.01 nm. A large resistance change by three orders of magnitude along the phase transition is observed, which makes the as-prepared smooth VO2 ceramic a promising candidate for various applications requiring optical and/or electronic switching behavior depending on temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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