摘要
对由Ca-Sm2O3-Fe体系通过还原扩散反应生成Sm2Fe17合金的过程进行热力学和动力学分析;研究了产物Sm2Fe17合金的收率及Sm和残余CaO的含量。结果表明:还原扩散法制备Sm2Fe17合金的收率较高,均大于80%,且残余CaO的含量极低,均小于0·55%;随着温度的上升和反应时间的延长,Sm2Fe17合金的收率和Sm2Fe17合金中Sm的含量均增大。收缩核模型处理结果表明:液态Sm和固态Fe之间的包晶反应为整个还原扩散反应过程的控速步骤;还原扩散反应的表观活化能为73.74kJ·mol-1,指前因子为7.79×10-3。
The formation of Sm2Fe 17 by reduction-diffusion(R-D) in Ca-Sm2O3-Fe system was analyzed by thermodynamics and kinetic dynamics, and the recovery of Sm2Fe 17 alloys and contents of Sm and CaO in Sm2Fe 17 were also investigated. Results show that the recovery rate of Sm2Fe 17 is higher than 80% and the content of CaO is less than 0.55%; and the recovery of Sm2Fe 17 alloys and the content of Sm increases with increasing temperature and longer time. Results dealing with contracting core model indicate that the reaction rate of R-D is controlled by peritectic reaction between Sm and Fe, the apparent activation energy of R-D is 73.74 kJ·mol -1 , and the pre-exponential factor is 7.79×10 -3 .
出处
《中国稀土学报》
CAS
CSCD
北大核心
2005年第3期291-294,共4页
Journal of the Chinese Society of Rare Earths
基金
国家863纳米专项(2002AA302602)资助项目
北京自然科学基金项目(2032011)
关键词
稀土永磁
Sm2Fe17合金
还原扩散
收缩核模型
活化能
稀土
rare earth permanent magnet material
Sm2Fe 17 compound
reduction-diffusion
contracting core model
activation energy
rare earths
