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Effect of microwave radiation and mechanical activation on the Carbothermic reduction of molybdenum trioxide: Improving the practical efficiency
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2020-04-21 , DOI: 10.1016/j.ijrmhm.2020.105269
K. Sheybani , S. Javadpour

In this research two different paths were used to cabothermic reduction of MoO3. In the first and second path, as received MoO3 and graphite with stoichiometric ratios were mixed and mechanically activated at 5, 10, 15 and 24 h and heating by microwave oven (first path) and furnace at 700 and 1000 °C in second path. The XRD results of activated samples before heating showed that, MoO2 was produced in the planetary ball mill after 5 h milling and don't change to another phase during milling up to 24 h. the SEM and XRD results in first and second path showed that the final product was molybdenum carbide but in the non-activated samples the final products were molybdenum carbide and unreacted MoO2. The practical efficiency calculations in first and second method showed that heating of samples by microwave radiation and mechanical activation increase the practical efficiency and decrease the sublimation of molybdenum trioxide. The TGA analysis of non-activated MoO3+ C mixture indicated that the reduction goes with three steps but in the 24 h activated sample, it was seen that the reduction goes with one peak. In other words, the first and second peaks in non-activated sample were not detected in the activated sample that increases the practical efficiency due to prevent the sublimation of MoO3



中文翻译:

微波辐射和机械活化对三氧化钼碳热还原的影响:提高实际效率

在这项研究中,使用两种不同的途径进行MoO 3的放热还原。在第一和第二路径中,将接收到的MoO 3和化学计量比的石墨混合并在5、10、15和24 h进行机械活化,并通过微波炉(第一路径)和第二路径在700和1000°C的加热炉加热。加热前活化样品的XRD结果表明,研磨5 h后,行星式球磨机产生了MoO 2,在研磨24 h内未发生相变。第一和第二路径的SEM和XRD结果表明,最终产物为碳化钼,但在未活化的样品中,最终产物为碳化钼和未反应的MoO 2。第一种方法和第二种方法的实际效率计算表明,通过微波辐射加热样品和机械活化可以提高实际效率,并减少三氧化钼的升华。非活化的MoO 3 + C混合物的TGA分析表明,还原过程分为三个步骤,但在24小时活化的样品中,还原过程出现一个峰。换句话说,在未活化样品中未检测到第一和第二峰,这由于防止了MoO 3的升华而增加了实际效率。

更新日期:2020-04-21
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