金属锰渗氮及热力学分析

A Study on Metal Manganese Nitriding and Thermodynamics

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 ,研究了粒度、渗氮时间等因素对金属锰渗氮的影响。粒度愈小 ,渗氮速度愈快。随渗氮时间的延长 ,除发生微量氧化生成MnO外 ,金属锰可全部氮化为Mn4 N和少量Mn2 N .应用规则溶液模型和有关研究报道计算得到 ζ相 (计量组成为Mn4 N )的生成自由能 :ΔG0 Mn4 N =- 110 85 0 (±30 0 0 ) + 6 4.714 (± 2 .2 )T(J/mol) .

The influence of grain size and time on the solid metal manganese nitriding was studied by means of vacuum resistance furnace and X ray diffraction technique.The less the grain sizes of powdered metal manganese,the faster the nitriding speed.Except for a little of oxide MnO developed,the metal manganese can thoroughly be nitrided into Mn 4N and some Mn 2N with the nitriding time lasted.Based on the regular solution model and the previous reports,an evalution of the Gibbs energy of formation of ζ phase (when the stoichiometric components as Mn 4N) was expressed as follows:ΔG 0 Mn 4N =-110850(±3000)+64.714(±2.2) T(J/mol).