摘要
用热重/差热(TG/DTA)分析法研究了粒度及升温速度对Sm2Fe17合金热稳定性的影响,结合XRD物相分析结果说明Sm2Fe17合金氧化过程中发生的化学反应,用Kinssinger法计算了Sm2Fe17合金被氧化所需的表观活化能并推断了其反应机理.结果表明:Sm2Fe17合金粉的粒度越细,其热稳定性越差;升温速度越快,Sm2Fe17合金的氧化温度增高,放出的热量减小.Kinssinger法计算Sm2Fe17合金在低温氧化时的表观活化能为162kJ·mol-1,在高温氧化时为189·8kJ·mol-1.
The effects of particle size and heating rate on the thermal stability of Sm2Fe17 alloy were investigated by TG/DTA technique. Chemical reactions during the oxidation of Sm2Fe17 alloy were confirmed with XRD and TG/DTA results. The apparent activation energy of the oxidation of Sm2Fe17 alloy was calculated by the Kinssinger equation and the reaction mechanism was deduced. The results show that the thermal stability of Sm2Fe17 alloy decreases with the decrease in particle size; and the sooner the heating rate is, the higher temperature needs for Sm2Fe17 alloy being oxidized and the less thermal it gives out. Further studies indicate that the apparent activation energies of low-temperature oxidation and high-temperature oxidation of Sm2Fe17 alloy are 162 kJ·mol^-1 and 189.8 kJ·mol^-1, respectively.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2007年第4期390-393,共4页
Journal of University of Science and Technology Beijing
基金
江西理工大学校基金资助项目
关键词
稀土永磁
热稳定性
活化能
热分析
X射线衍射分析
rare earth permanence magnet
thermal stability
activation energy
thermal analysis
X-ray diffraction analysis
