Sm（CobalFexCu0.049Zr0.024）7.5（x=0.102-0.282）的结构和磁性能

Microstructure and Magnetic Properties of Sm（CobalFexCu0.049Zr0.024）7.5（x=0.102-0.282）

采用XRD,AFM等检测方法研究了Fe含量对Sm（CobalFexCu0.049Zr0.024）7.5（x=0.102-0.282）的磁性能和显微结构的影响。结果表明,磁体的Br先随Fe含量的增加而增加,在x=0.239时达最大值1.099 T,进一步增加Fe含量由于FeCo软磁性相的形成而导致Br下降。当Fe含量由x=0.239增加至0.282时,Hci由最大值1660.3 kA·m^-1迅速降低至979.1kA·m^-1。Fe含量对磁体的相结构没有显著的影响,主要由2∶17R相、1∶5相和2∶17H相构成。但当Fe含量x〈0.197时,Sm（CobalFexCu0.049Zr0.024）7.5的胞状组织未发生显著变化,平均尺寸约为80nm;当Fe含量x〉0.197时,胞状结构发生长大,均匀性变差,胞状结构的变化导致矫顽力的温度稳定性随Fe含量的增高而大幅降低;当x=0.282时,磁体在500℃下的Hci只有114 kA·m^-1,磁通不可逆损失达-36.7%。

The effect of Fe on the microstructure and magnetic properties of Sm（CobalFexCu0.049Zr0.024）7.5（x=0.102-0.282） was studied using XRD and AFM analysis. Br increased with the increase of Fe content until Br reached the maximum value of 1. 099 T at x = 0. 239, and then decreased because of the formation of FeCo soft magnetic phase. By increasing Fe content from x = 0. 239 to 0. 282, the coercivity was found to vary dramatically from 1660.3 to 979.1 kA· m^-1, respectively. The magnet was mainly composed of 2：17R phase, 1：5 phase and 2：17H phase of after annealing and was not strongly influenced by the Fe content. But when the Fe content was lower than x = 0. 197, the samples exhibited a homogeneous cellular microstructure with an average cell diameter of 80 nm. With increasing Fe content up to x = 0. 282, the cellular size increased to 150 nm and the cellular microstructure was not uniform. The transformation of cellular structure led to decreasing in the temperature steadibility of coercivity dramatically with Fe content increasing. For x = 0. 282, Hci measured at 500 ℃ was about 114 kA·m^-1, and the Irr. loss was about - 36.7%.