Effects of Particle Size on Nitridation Kinetics of Manganese Powder  

作　　者：Ting LUO Jian-hua LIU Hong-bo LIU Jian LIU 

机构地区：[1]Research Institute of Metallurgy Engineering,University of Science and Technology Beijing

出　　处：《Journal of Iron and Steel Research International》2015年第6期543-550,共8页

基　　金：Sponsored by National Natural Science Foundation of China(51374023)

摘　　要：Isothermal thermo-gravimetric analysis was applied to investigate the nitridation kinetics of manganese powder with different particle sizes at 800, 900 and 1000 ℃. The apparent activation energy and nitridation kinetics equations of manganese powder with different particle sizes were obtained from unreacted shrinking core model and Arrhenius formula. It was found that the nitridation mechanism was controlied by interracial chemical reaction. The apparent activation energy and the apparent rate constant of nitridation reaction were affected by particle sizes. With the decrease of particle size, the apparent activation energy decreased whilst the apparent rate constant increased. It was suggested that the refinement of the manganese powder contributed to the increase of molar surface energy, which accounted for the lower apparent activation energy.Isothermal thermo-gravimetric analysis was applied to investigate the nitridation kinetics of manganese powder with different particle sizes at 800, 900 and 1000 ℃. The apparent activation energy and nitridation kinetics equations of manganese powder with different particle sizes were obtained from unreacted shrinking core model and Arrhenius formula. It was found that the nitridation mechanism was controlied by interracial chemical reaction. The apparent activation energy and the apparent rate constant of nitridation reaction were affected by particle sizes. With the decrease of particle size, the apparent activation energy decreased whilst the apparent rate constant increased. It was suggested that the refinement of the manganese powder contributed to the increase of molar surface energy, which accounted for the lower apparent activation energy.

关 键 词：manganese powder NITRIDATION isothermal thermo-gravimetric analysis apparent activation energy KINETICS 

分 类 号：TF04[冶金工程—冶金物理化学] TF764.1