快淬Sm_2(Fe,Al,Zr)_(17)C_(1.5)合金的磁性

Magnetic Properties of Melt-Spun Sm_2 (Fe, Al, Zr)_(17)C_(1. 5) Ribbons

利用X衍射仪）、振动样品磁强计对台Zr快淬Sm_2Fe_（15.5-x）ZrxAl_(1.5)C_(1.5)（x=0～0.8)合金的微结构和磁性进行了研究。结果表明，在合金中添加Zr以后，形成了一个高熔点的ZrC相。ZrC相弥散分布在品位边界或品社交偶处，可有效地抑制快淬合金在品化过程中的晶粒长大。样品在750℃经30分钟时效后，获得的最佳剩磁为55A·m^2/kg，矫顽力为923kA／m。其退磁曲线具有较好的方形度。可以认为高剩磁和矫顽力是由于添加Zr以后获得了细小的微结构的结果．

The structure and magnetic properties of melt-spun Sm_2Fe_(15.5-x)ZrxAl_(1.5)C_(1.5) samples have been studied using X-ray diffraction and a vibrating sample magnetometer. Addition of Zr to Sm_2Fe_(15.5-x)ZrxAl_(1.5)C_(1.5) alloys results in the formation of a ZrC compound with a high melting point. The ZrC compound distributes diffusely around grain boundaries or at grain junc- tions,and is effective at inhibiting grain growth during crystallizing process. A high coercivity of up to 923 kA/m along with a remanence of up to 55 A .m2/kg is obtained for the Sm2Fe15.3Zr0.2 Al1.5C1.5 ribbon annealed at 75OC for 30 min. The high remanence and coercivity are ascribed to the addition of Zr,which results in a small crystal size.