In-situ synthesis of chromium carbide (Cr3C2) nanopowders by chemical-reduction route |
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| Affiliation: | 1. Department of Chemical and Materials Engineering, The University of Auckland, Auckland, New Zealand;2. Fraunhofer-Institut für Keramische Technologien und Systeme, Winterbergstr. 28, D-01277 Dresden, Germany;1. DEN-Service de la Corrosion et du Comportement des Matériaux dans leur Environnement, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France;2. GEMaC, UMR 8635, Université de Versailles-Saint-Quentin, 45 avenue des Etats-Unis, 78035 Versailles, France;3. Safran-Tech, rue des jeunes bois, Châteaufort, 78772 Magny-les-Hameaux, France;1. National Institute of Technology, Warangal 506004, India;2. Materials Group, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China;2. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China |
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| Abstract: | Chromium carbide nanopowder (Cr3C2) has been synthesized from chromium oxide (Cr2O3) by chemical-reduction route under autogenic pressure of hydrogen and CO gases at 87 MPa. The reduction of Cr2O3 to Cr3C2 has taken place at a relatively low temperature (700 °C) in the presence of Mg in an autoclave. The increased pressure of hydrogen and CO gases facilitates the reduction and carburization simultaneously which helps in reducing the reaction temperature. The nanopowder shows faceted morphology as observed in TEM. High resolution transmission electron micrographs reveal that the size of Cr3C2 powders varies in the range of 30–40 nm and is coated by 12–13 layers of carbon with average thickness of 3.5–4 nm. Thermal stability of the as-obtained product was investigated by TGA/DTA analysis. Based on the experimental results, possible reaction mechanism for the transformation and formation of nanopowder is discussed in the light of the obtained structure. |
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