SmCo_5永磁材料组织结构及温度磁特性的研究

Study on the microstructure and temperature-magnetic characteristics of SmCo_5 hard magnet

运用金相显微镜、X射线衍射及AMT-4硬磁测试系统对粉末冶金方法制备SmCo5永磁材料的组织结构与性能进行了表征,重点利用AMT-4高温硬磁测试系统对其从20～150℃温度范围内磁性能进行了测试研究。结果表明,粉末冶金方法制备的SmCo5材料为平均晶粒度在20μm左右的等轴晶,主要由两个相组成,Sm大量向晶界处移动,在晶界处形成氧化物。SmCo5材料主要磁性能指标随着温度的升高都有所降低,但降低速度有所不同。其在20～150℃范围内主要磁性能指标的温度系数均为负值,其中磁能积温度系数最大。

The microstructure and magnetic performance of SmCo5 hard magnet was characterized by microscopy,X-ray diffraction and AMT-4 hard magnetic testing system.And the magnetic performance of SmCo5 between 20 to 150℃ was tested by AMT-4 high temperature testing system.Results show that the microstructure of SmCo5 prepared by metal powder technology contains two main phases with a mean grain size of 20μm.And the surplus Sm and its oxides gather on the grain boundaries.The magnetic performance of SmCo5 decreased with the increase of temperature.The temperature coefficient of the main magnetic parameters of SmCo5 are all negative while the（BH）mof SmCo5 between 20 to 150℃ gets a max value.