Ce17Fe78-xB6Mx (M=Cu, Al, Ga; x=0-1.0)快淬合金永磁性能研究

Permanent magnetic properties of rapidly quenched Ce17Fe78-xB6Mx (M=Cu, Al, Ga; x=0-1.0) alloys

摘要:

本文基于熔体快淬技术,研究了低熔点元素Cu、Al和Ga添加对Ce₁₇Fe₇₈B₆合金磁性能的影响。三类低熔点元素的加入,均降低了合金的磁化强度,而矫顽力有一定程度的提升。其中,Cu和Ga元素添加可优化晶粒尺寸分布,且Ga添加对Ce₁₇Fe₇₈B₆合金矫顽力的提升最为有效。研究发现,Ce₁₇Fe₇₈B₆合金回复曲线轻微开口；当Ga添加量为0.75 at.%时,合金具有较优异的综合磁性能,回复曲线完全闭合。适量Ga元素添加明显增强了Ce-Fe-B基合金晶间短程交换耦合作用,减小了合金平均回复磁导率,有效降低了Ce-Fe-B基合金在周期性反向磁场中的能量损失。

Abstract:

The effects of low melting point elements Cu, Al and Ga on the magnetic properties of Ce₁₇Fe₇₈B₆ alloys prepared by melt spinning technique are studied. The addition of these elements decreases the saturation magnetization, while the coercivity increases to a certain extent. Among the additive elements, the addition of Cu and Ga optimize grain size distribution, Ga addition is the most effective way to improve the coercivity of Ce₁₇Fe₇₈B₆ alloy. The recoil loop of Ce₁₇Fe₇₈B₆ alloy is slightly open. The best overall magnetic properties are obtained for Ce₁₇Fe_77.25B₆Ga_0.75 alloy. Compared with the counterpart Ce-Fe-B alloy, the exchange coupling interaction between the grains of Ce-Fe-B-Ga alloy is enhanced. The recoil loops closes completely and the average recovery permeability decreases, which effectively enhances the resistance of Ce-Fe-B based alloys to external magnetic field interference.