采用粉末冶金工艺制备了高温稀土永磁Sm(CobalFexCu0.1Zr0.03)7.5 (x=0.09～0.21),研究了Fe含量对磁体磁性能的影响.结果表明:随着Fe含量的增加,剩磁Br和最大磁能积(BH)max逐渐增加,在x=0.21时获得最大值,分别为0.96 T和176.7 kJ/m3;内禀矫顽力Hci先增加后降低,在x=0.15时获得峰值2276.6 kA/m.最佳工艺制备(x=0.15)的磁体温度稳定性良好,B-H退磁曲线在温度为500 ℃时保持为直线;内禀矫顽力温度系数β为-0.16%/℃,最高使用温度(OT)max达到533 ℃.
The influence of Fe content on magnetic properties of high temperature rare earth permanent magnets Sm(CobalFexCu0.1Zr0.03)7.5 (x=0.09~0.21), prepared by the conventional powder metallurgy method, has been studied. The results show that: with increasing of Fe content, Br and (BH)max increased, the optimum value of Br and (BH)max reached to 0.96 T and 176.7 kJ/m3 while x=0.21; Hci increased first, then decreased with further increasing of Fe content; the optimum value of Hci reached to 2276.6 kA/m while x=0.15. The temperature stability of the magnet with x=0.15, prepared by optimum process, has been proved to be excellent, and the B-H demagnetization curve kept a straight line at 500 ℃; the intrinsic coercivity coefficient β was -0.16%/℃, and the maximum operating temperature was to 533 ℃.
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