纳米晶复合Nd_(8.5)Fe_(76.6-x)Ga_xCo_5Zr_(2.7)B_(6.2)(x=0～0.5)粘结磁体磁性能的研究

Study on the magnetic properties of the nanocomposite Nd_(8.5)Fe_(76.6-x)Ga_xCo_5Zr_(2.7)B_(6.2)(x=0～0.5) bonded magnet

采用快淬和晶化退火法制备了成分为Nd8.5Fe76.6-xGaxCo5Zr2.7B6.2（x=0-0.5）的纳米晶复合永磁粘结磁体,研究了其磁性能的变化。结果表明,适量Ga元素的添加能有效提高磁体退磁曲线的方形度,进而提高磁体的最大磁能积。Ga含量0.2%（原子分数）,快淬速度为16.0m/s的合金经670℃/4min的晶化处理后,制得的粘结磁体具有较佳的磁性能：Br=0.745T,jHc=730.1kA/m,（BH）max=80.1kJ/m^3。适量的Ga元素的添加可以提高磁体的温度稳定性。Ga含量为0.2%（原子分数）的合金具有较好的温度系数,在25-150℃温度区间内剩磁温度系数α=-0.091%/℃,内禀矫顽力温度系数β=-00353%/℃。

Nanocomposit e Nd8. 5 Fe76.6-x Gax Co5 Zr2.7 B6.2 （x = 0. 5） bonded magnets were prepared by melt-spun and subsequent annealing. The magnetic properties of the magnets were investigated. The results suggest that adding proper gallium could improve the squareness of the demagnetization curve and increase the maximum energy product of the magnets. The optimum magnetic properties of Br = 0. 745T,j Hc = 730. 1 kA/m, （BH） max = 80. 1 kJ/ m^3 were obtained for Nd8.5 Fe76.6-xGaxCo5 Zr2.7 B6.2 bonded magnet with 16m/s wheel speed and 670℃ annealing treatment. Additionally,the temperature coefficient of remanence and coercivity for the temperature range of 25 to 150℃ were-0.091%℃ -0. 353%/℃ for the N8.5Fe76.5-xCaxCo5 Zr2.7 B6.2 bonded magnet.