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Ca-Tb₄O₇-Fe体系中生成TbFe₂的动力学研究

Kinetics for Formation of TbFe₂ in Ca-Tb₄O₇-Fe System

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【Author】 Guo Guangsi 1*, Wang Guangtai 1, Pang Hong 1, Li Jianjun 1, Sui Zhitong 2 (1. Department of Materials Sciences and Engineering, Shenyang Institute of Technology, Shenyang 110016, China; 2. College of Materials and Metallurgy, Northeastern University, Shengyang 110015, China)

【机构】沈阳工业学院材料科学与工程系；东北大学材料与冶金学院辽宁沈阳110016；辽宁沈阳110016；辽宁沈阳110015；

【摘要】高纯TbFe2 可以作为生产 (TbDy)Fe2 的一种中间合金原料。开发低成本、无污染、直接从氧化铽还原制备高纯TbFe2 的方法具有非常重要的实际意义。本文在已有关于Ca Tb4O7 Fe体系 ,还原扩散法制备TbFe2 合金在热力学上可能的基础上 ,进一步研究了其动力学可行性。XRD物相鉴定证明生成物是TbFe2 ;应用收缩核模型得知 :扩散是反应的控制步骤 ,表观活化能Ea=39kJ·mol- 1 。更多还原

【Abstract】 The pure TbFe₂ is a sort of intermetallic compound to produce （TbDy）Fe₂. It is important to develop a new method for producing pure TbFe₂ by Tb₄O₇ with low cost and non-pollution. The possibility of TbFe₂ by reduction-diffusion in Ca-Tb₄O₇-Fe system was proved from our previous thermodynamic work. To produce TbFe₂ by reduction-diffusion in the Ca-Tb₄O₇-Fe system is also feasible in these kinetic conditions. It is confirmed that the product is TbFe₂ by means of XRD. The contracting core model is applied. The reactions are found to be diffusion controlled. The apparent activation energy of TbFe₂ is 39 kJ·mol -1.更多还原