(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B(x=0~0.4)永磁合金磁性能与微结构的研究

Study on the magnetic properties and microstructures of the(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B(x=0~0.4)alloys

目的:通过降低稀土含量来研究(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B合金的磁性能和微结构变化规律,获得高性能高丰度磁体的制备方法。方法:采用直接快淬法制备了不同稀土含量的(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B(x=0~0.4)纳米晶薄带合金,研究了稀土含量对合金样品磁性能、磁化行为和微结构的影响。结果:随稀土含量的降低,合金中软磁相α-Fe的相对含量可以得到有效控制;(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B合金在x=0.2时,获得了最佳的磁性能:H_(cj)=7.70 kOe,B_(r)=10.77 kG,和(BH)_(max)=16.1 MGOe。结论:通过M_(d)(H)/M_(r)(∞)与M_(r)(H)/M_(r)(∞)的关系曲线分析了不同合金样品的磁化反转特性,得出合金的矫顽力机理均为成核机制。

Aims:The magnetic properties and microstructures of(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B(x=0~0.4)alloys were studied by reducing the content of rare earth;and the preparation method of high performance and high abundance magnet was obtained.Methods:The(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B(x=0~0.4)nanocrystalline alloys were prepared by the melt-spinning method;and the effect of rare earth content on the magnetic properties,magnetization reversal behavior and microstructures of(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B nanocrystalline alloys was investigated.Results:With the decrease of rare earth content,the soft magneticα-Fe phase in the alloy could be effectively controlled.The results of magnetic properties showed that the optimal magnetic properties were obtained for alloys with x=0.2 in the(Nd_(0.8)La_(0.2))_(1-x)Fe_(12)Co_(2)B alloy:H cj=7.70 kOe,B_(r)=10.77 kG and(BH)_(max)=16.1 MGOe.Conclusions:The magnetization reversal characteristics of the nanocomposite alloys were analyzed by the M d(H)/M_(r)(∞)vs M_(r)(H)/M_(r)(∞)curves,it showed that the coercivity mechanism of the alloys was a nucleation model.