较系统地研究了Fe和Cu含量对Sm(CobalFexCuyZr0.03)7.5(x=0.16-0.28, y=0.06, 0.08)磁体的室温和中温段磁性能的影响. 研究表明,室温下内禀矫顽力iHc随Fe含量的增加先增大后减小,最高可以达到2473 kA/m;剩磁Br随Fe含量的增加而增大. 在相同Fe含量的情况下, 随Cu含量增加内禀矫顽力iHc均增大. 矫顽力温度系数的绝对值|β|随Fe含量的增加单调增大,随Cu含量的增加而降低.
The magnetic properties of commercial 2∶17–type SmCo magnet is low at high temperature, despite good properties at room temperature and its application temperature is usually lower than 300 ℃. In recent years, significant progress has been made on the development of SmCo permanent magnets for high temperature applications. Despite the maximum operating temperature being up to 500 ℃, the magnets were found to have low magnetic properties at room temperature and 350 ℃. Thus, there has been a demand for developing permanent magnet materials with high properties at moderate temperatures below 350 ℃. The effect of Fe and Cu contents on the magnetic properties of Sm(CobalFexCuyZr0.03)7.5 (x=0.16—0.28, y=0.06, 0.08) magnets at room temperature and 350 ℃ have been systematically studied. The results show that with increasing Fe content, the intrinsic coercivity iHc gradually increases, reaching an optimal value of 2473 kA/m, and then drops rapidly at room temperature; the remanence Br rises monotonically with increasing Fe content. The intrinsic coercivity iHc increases with raising Cu at a constant Fe content. The absolute value of temperature coefficient of coercivity |β| rises monotonically with increasing Fe content, and decreases with increasing Cu content. Sm(CobalFe0.20Cu0.08Zr0.03)7.5 alloy is expected for potential applications at moderate temperatures below 350 ℃.
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