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研究了HDDR工艺制备的Nd-Fe-B永磁合金的晶粒界面微结构对各向异性和矫顽力的影响.考虑到其磁粉晶粒界面的特殊微结构,提出了同时受界面结构缺陷和交换耦合相互作用影响的各向异性理论模型.计算了成核和钉扎机制的结构缺陷因子随2r0/lex(r0和lex分别为晶粒表面缺陷厚度和交换耦合长度)的变化.结果表明,HDDRNd-Fe-B永磁合金的矫顽力机制与晶粒界面微结构的缺陷有关:在lex确定的条件下,当2r0/lex<1.67时,决定矫顽力的主要机制是畴壁钉扎;当2r0/lex>1.67时,决定矫顽力的主要机制是反磁化成核.当2r0/lex=1.67时,矫顽力出现最大值,并与Morimoto等人的实验结果符合很好。
The effect of grain boundary microstructure on the anisotropy and coercivity of Nd-Fe-B permanent magnet alloy prepared by HDDR process was studied.According to the special microstructure of the interface of the magnetite powder, the interface structure defect And the exchange coupling interaction of the anisotropic theoretical model.The nucleation and pinning mechanism of the structural defect factor with 2r0 / lex (r0 and lex are the grain surface defect thickness and exchange coupling length) changes.The results show that The coercive mechanism of HDDRNd-Fe-B permanent magnet alloys is related to the defects of the grain-boundary microstructure. The main mechanism determining coercivity when 2r0 / lex <1.67 under the conditions determined by lex is domain wall nail When 2r0 / lex> 1.67, the main mechanism of determining coercive force is anti-magnetization. When 2r0 / lex = 1.67, the maximum coercivity appears, which is in good agreement with the experimental results of Morimoto et al.