Ca-Sm_2O_3-Fe体系生成Sm_2Fe_(17)的研究  

Formation of Sm_2Fe(17) Compound in Ca-Sm_2O_3-Fe System

作　　者：邓庚凤[1] 孙光飞[2] 陈菊芳[2] 庞利佳[1] 胡权霞[1] 方克明[1] 

机构地区：[1]北京科技大学冶金学院 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国稀土学报》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)

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 .

关 键 词：稀土永磁 Sm2Fe17合金 还原扩散 收缩核模型 活化能 稀土 

分 类 号：TG132.2[一般工业技术—材料科学与工程]