【作者】 赵跃萍； 张金柱；

【Author】 Zhao Yueping~*, Zhang Jinzhu ( Institute of Material Science and Metallurgy Engineering, Guizhou University of Technology, Guiyang 550003, China)

【机构】 贵州工业大学材料与冶金工程学院；

【摘要】 应用真空电阻炉高温渗氮、X射线衍射、惰气熔融法氧氮分析等实验测试方法,研究了金属锰在1143 K含氮气氛中氮化的动力学规律。氮化试样的相组成一般为Mn_N和α-Mn,随渗氮时间的延长,金属锰可全部氮化为Mn₄N和ζ-（Mn₂N）。氮原子通过氮化产物层ζ相的扩散过程是金属锰氮化的主要控制环节。金属锰的转化率和反应时间的关系可表示为:1-3（1-x）^2/3+2（1-X）=Kt。更多还原

【Abstract】 The kinetics and the influence of time on the solid metal manganese nitriding was studied by means of vacuum resistance furnace,X ray diffraction technique and LECO TC-436 Oxygen/Nitrogen Determinator. The phases of the samples nitrided consist of Mn₄N and □-Mn and the metal manganese can thoroughly be nitrided into Mn₄N and a little □-phase （the stoichiometric components as Mn₂N） with the nitriding time lasted. A kinetic model is developed to reveal the nitriding situation and agrees well with the experimental results. The effective diffusivity of nitrogen through the □ phase layer, D_e, can be calculated as 2.1×10^-9 cm²/S by De=K□ _sr²/(9（C_s-C_o）M_Mn), and the relationship between the manganese conversion and reaction time can be expressed as: 1-3（1- X）^2/3+2（1-X）=Kt.更多还原