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 ℃.
YU Qian
,
JIANG Cheng-Bao
. STUDY ON SmCo PERMANENT MAGNETS UNDER 350℃ MODERATE TEMPERATURES[J]. Acta Metall Sin, 2011
, 47(12)
: 1605
-1610
.
DOI: 10.3724/SP.J.1037.2011.00544
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