A study on mechanochemical behavior of MoO3–Mg–C to synthesize molybdenum carbide |
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| Affiliation: | 1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan. PR China;2. Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals, Changsha 410083, Hunan, PR China;1. Department of Mechanical Engineering, Nehru Institute of Technology, Coimbatore 641105, Tamil Nadu, India;2. Department of Mechanical Engineering, Anna University, Chennai 600025, Tamil Nadu, India;3. Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg 2006, South Africa;4. Department of Mechanical Engineering, Roever College of Engineering and Technology, Perambalur 621212, Tamil Nadu, India;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China;3. State Key Laboratory of Iron and Steel Industry Environmental Protection, Beijing 100088, China;4. Energy Conservation and Environment Protection Co., Ltd, MCC Group, Beijing 100088, China;5. Central Research Institute of Building and Construction Co., Ltd, MCC Group, Beijing 100088, China |
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| Abstract: | The influence of Mg value in the MoO3–Mg–C mixture on the molybdenum carbide formation and the mechanism of reactions during mechanochemical process were investigated. In keeping with this aim, magnesium and carbon contents of the mixture were changed according to the following reaction: 2MoO3 + (6 ? x) Mg + (1 + x) C = (6 ? x) MgO + Mo2C + x CO. The value of x varied from 0 to 6. Differential thermal analysis (DTA) results for sample with stoichiometric ratio (x = 0) revealed that in the early stage, carbon reduced the MoO3 to MoO2 and subsequently highly exothermic magnesiothermic MoO2 reduction occurred after magnesium melting. Also, it was indicated that the exothermic reaction temperature shifted to before magnesium melting in the 11 h-milled sample (x = 0) and all the exothermic reactions happened, simultaneously. According to the experimental findings, molybdenum carbide (Mo2C) was synthesized in the mixture powder with stoichiometric ratio (x = 0) after 12 h milling process and the type of reactions was mechanically induced self-sustaining reaction (MSR). However, at lower Mg content in the MoO3–Mg–C mixture (0 < x ≤ 2), the magnesiothermic reduction occurred in MSR mode and activated the carbothermal reaction. Further decrease in Mg value (2 < x ≤ 3) resulted in MSR mode magnesiothermic reaction and gradual carbothermal reduction. In samples with lower magnesium contents, partial molybdenum oxide reduction proceeded through a gradual mode magnesiothermic reaction. |
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