Influence of dynamic crystallization on exchange-coupled NdFeB nanocrystalline permanent magnets

稀有金属（英文版）, 2006, 25(z1): 596-601.

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1.Department of Material Science and Engineering, Sichuan University, Chengdu 610064, China

2.Department of Material Science and Engineering, Sichuan University, Chengdu 610064, China

3.Department of Material Science and Engineering, Sichuan University, Chengdu 610064, China

4.Department of Material Science and Engineering, Sichuan University, Chengdu 610064, China

5.Department of Material Science and Engineering, Sichuan University, Chengdu 610064, China

6.Department of Material Science and Engineering, Sichuan University, Chengdu 610064, China

基金项目: New Century Excellent Person Support Program of China(NCET-04-0873) Major Science Plan of Sichuan Province(03GG009-006) 四川省杰出青年学者科学基金(03ZQ026-006)

Influence of dynamic crystallization on exchange-coupled NdFeB nanocrystalline permanent magnets

Keywords： dynamic crystallization

Dynamic crystallization was introduced to improve the magnetic properties of NdFeB nanocrystalline permanent magnets by optimizing microstructure. The microstructure was studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It has been determined that, compared with the conventional heat treatment, dynamic crystallization can shorten the crystallization time. Moreover, dynamic crystallization can refine grains, enhance the exchange-coupled interaction among grains, and promote the magnetic properties. As a result, the optimal magnetic properties of Nd10.5(FeCoZr)83.4B6.1(Br＝0.685T, Hci ＝732 kA·m -1 , Hcb ＝429 kA·m-1 ,( BH )m=75 kJ·m -3 ) are obtained after dynamic crystallization heat treatment at 700 ℃ for 10 min.

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Influence of dynamic crystallization on exchange-coupled NdFeB nanocrystalline permanent magnets

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