Ce掺杂Nd-Fe-B永磁合金的结构及磁性能研究

Effects of Ce doping on the structure and magnetic properties for NdFeB alloy

摘要:

本文通过电弧熔炼和熔体快淬技术制备了不同甩帯速度和Ce含量的(Nd1-xCex)2Fe14B合金薄带,研究发现,薄带主要由主相Nd2Fe14B和一定量α-Fe相组成。不同的甩带速度对样品的磁性能影响显著,其中甩带速度为30m/s所制备薄带的磁性能最佳。随着Ce含量的增加,薄带的磁性能整体呈下降趋势,矫顽力从x=0时的800kA/m下降到x=0.5时的413kA/m。但在x=0.2时,矫顽力可达594 kA/m,呈现反常增加现象,这与物质稀释定律相反,这可能归因于Ce混合价态所导致的相分离。x=0.25时,相比未添加Ce的样品,最大磁能积几乎没有下降,这表明Ce在稀土永磁中应用潜力巨大。

Abstract:

(Nd1-xCex)2Fe14B ribbons were prepared by arc melting followed by melt spinning. It is found that the ribbons are mainly composed of the main phase Nd2Fe14B and α-Fe phase. The optimum magnetic properties can be obtained using the wheel velocity of 30 m/s. With increasing the Ce content, the coercivity reduces from 800 kA/m when x=0 to 413 kA/m when x=0.5. However, the coercivity is anomalously high when the 20% Nd is replaced by Ce. It is attributed to the phase segregation induced by mixed valence state of Ce. No reduction in the maximum energy product is demonstrated when x=0.25. It is suggested that Ce has a great potential application in the permanent magnetic materials.