The Impact Induced Demagnetization Mechanism in NdFeB Permanent Magnets

被引：0

作者：

李岩峰 ^{[1
,2
]}

朱明刚 ^{[1
]}

李卫 ^{[1
]}

周栋 ^{[1
]}

鲁峰 ^{[3
]}

陈朗 ^{[3
]}

伍俊英 ^{[3
]}

齐岩 ^{[2
]}

杜安 ^{[2
]}

机构：

[1] Division of Functional Materials,Central Iron and Steel Research Institute

[2] College of Science,Northeastern University

[3] State Key Laboratory of Explosion Science and Technology,Beijing Institute of

来源：

Chinese Physics Letters | 2013年 / 30卷 / 09期

关键词：

D O I：

暂无

中图分类号：

TM273 [永磁材料、永久磁铁];

学科分类号：

摘要：

Compression of unmagnetized Nd2Fe14B permanent magnets is executed by using shock waves with different pressures in a one-stage light gas gun system.The microstructure,crystal structure,and magnetic properties of the magnets are examined with scanning electronic microscopy,x-ray diffraction,hysteresis loop instruments,and a vibrating sample magnetometer,respectively.The NdFeB magnets display a demagnetization phenomenon after shock wave compression.The coercivity dropped from about 21.4kOe to 3.2kOe.The critical pressure of irreversible demagnetization of NdFeB magnets should be less than 4.92 GPa.The coercivity of the NdFeB magnets compressed by shock waves could be recovered after annealing at 900°C and 520℃for 2h,sequentially.The chaotic orientation of Nd2Fe14B grains in the compressed magnets is the source of demagnetization.

引用

页码：157 / 160

页数：4

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