在前期研究工作的基础上,从热磁重(TMA)测量出发对快淬Nd9Fe85-xMnxB6(x=0~2)的相关磁性能及交换耦合效应作了进一步的研究.发现在最佳的热处理条件下,一定的Mn掺杂能提高快淬NdFeB的磁性能,特别是矫顽力最大能提高20%左右,但是更高的Mn掺杂量会导致矫顽力和最大磁能积的明显下降.XRD显示快淬态的NdFeB样品的晶化程度随Mn掺杂量提高而提高,但在最佳的热处理条件下所有的快淬NdFeB样品都包括硬磁性相Nd2Fe14B和软磁性相α-Fe.热磁重(TMA)测量显示一直随着Mn掺杂量提高到2%(原子分数),硬磁性相Nd2Fe14B的居里温度(Tc)在不断下降,但是α-Fe的Tc却随Mn掺杂量提高而提高.认为磁性能和居里温度改变是因为形成了δ-Mn和R2Fe23B3相.当Mn掺杂量较低时高温下有δ-Mn形成并和α-Fe产生交换耦合作用导致α-Fe的居里温度升高,而当Mn掺杂量提高到2at%时形成的R2Fe23B3相固溶δ-Mn相才导致α-Fe的居里温度下降.
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