Thermal stability of surface modified Sm2Co17-type high temperature magnets
Thermal stability of surface modified Sm2Co17-type high temperature magnets
复制标题
表面改性Sm2Co17型高温磁体的热稳定性
DOI：
10.1016/j.jmmm.2012.11.013
复制
发表时间：
2013-04-01
影响因子：
2.7
通讯作者：
Jiang, Chengbao
中科院分区：
文献类型：
--
作者：
Wang, Qingyun;Zheng, Lei;Jiang, Chengbao
系统研究了经镍涂层改性的Sm（CobalFe0.1Cu0.1Zr0.033）（6.93）永磁体的氧化行为和磁损耗。研究揭示了镍涂层和未涂层磁体在500 ℃空气中的氧化动力学规律和磁性能。结果表明，未涂层磁体在100 h和500 h的氧化增重分别为4.02 mg/cm ~ 2和8.48 mg/cm ~ 2。而在500 ℃下氧化100 h和500 h的涂层磁体的增重分别仅为0.06 mg/cm（2）和0.22 mg/cm（2）。比较了涂层磁体与未涂层磁体在500 ℃氧化不同时间后的剩磁损失B-r、矫顽力H-cb和最大磁能积（BH）（max）。涂层磁体的磁性能在室温和500摄氏度下都是稳定的，而未涂层磁体的磁性能急剧下降。扫描电子显微镜和X射线衍射结果揭示了有序表面氧化带的相组成，表明Ni涂层与磁体之间的相互扩散很小，Ni涂层可以隔离氧的侵入，阻止Sm的挥发。这些结果表明，镍涂层可以有效地保护和稳定Sm 2Co 17型高温磁体在500 ℃。(C)2012 Elsevier B. V.保留所有权利。
The oxidation behavior and magnetic loss of Sm(CobalFe0.1Cu0.1Zr0.033)(6.93) magnets modified with nickel coating were systematically studied. The research reveals the laws of oxidation kinetics and magnetic properties of the Ni-coated and uncoated magnets oxidized at 500 degrees C in air. The results show that the mass gain of the uncoated magnets is 4.02 mg/cm(2) for 100 h oxidation and 8.48 mg/cm(2) for 500 h oxidation. As for the coated magnets oxidized at 500 degrees C for 100 h and 500 h, the mass gain is only 0.06 mg/cm(2) and 0.22 mg/cm(2), respectively. The loss of remanence B-r, coercivity H-cb and maximum energy product (BH)(max) of the coated magnets oxidized at 500 degrees C for different time were compared with those of the uncoated magnets. The magnetic properties of the coated magnets are stable at both room temperature and 500 degrees C, while the magnetic properties of the uncoated magnets decrease drastically. The results of scanning electron microscope and X-ray diffraction reveal the phase constitution of ordered surface oxidation zones, showing that the interdiffusion between Ni coating and the magnet is slight and Ni coating can isolate oxygen invasion and hinder Sm volatilization. These results indicate that nickel coating can protect and stabilize Sm2Co17-type high temperature magnet effectively at 500 degrees C. (C) 2012 Elsevier B.V. All rights reserved.