The Impact Induced Demagnetization Mechanism in NdFeB Permanent Magnets

被引：13

作者：

Li Yan-Feng ^{[1
,3
]}

Zhu Ming-Gang ^{[1
]}

Li Wei ^{[1
]}

Zhou Dong ^{[1
]}

Lu Feng ^{[2
]}

Chen Lang ^{[2
]}

Wu Jun-Ying ^{[2
]}

Qi Yan ^{[3
]}

Du An ^{[3
]}

机构：

[1] Cent Iron & Steel Res Inst, Div Funct Mat, Beijing 100081, Peoples R China

[2] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China

[3] Northeastern Univ, Coll Sci, Shenyang 110819, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2013年 / 30卷 / 09期

基金：

中国国家自然科学基金;

关键词：

SHOCK-WAVE DEMAGNETIZATION; PRIMARY POWER; PHASE; IRON; DEPENDENCE; GENERATOR;

D O I：

10.1088/0256-307X/30/9/097501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 21.4 kOe to 3.2 kOe. 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 degrees C and 520 degrees C for 2 h, sequentially. The chaotic orientation of Nd2Fe14B grains in the compressed magnets is the source of demagnetization.

引用

页数：4

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