Effect of Terbium addition on the coercivity of the sintered NdFeB magnets

被引：23

作者：

Pan Minxiang ^{[1
]}

Zhang Pengyue ^{[1
]}

Li Xianjun ^{[2
]}

Ge Hongliang ^{[1
]}

Wu Qiong ^{[1
]}

Jiao Zhiwei ^{[1
]}

Liu Tingting

机构：

[1] China Jiliang Univ, Dept Mat Sci & Engn, Hangzhou 310018, Peoples R China

[2] Beijing Res Inst Mech & Elect Technol, Beijing 100083, Peoples R China

来源：

JOURNAL OF RARE EARTHS | 2010年 / 28卷

关键词：

sintered magnets; Kronmuller-plot; coercivity; nucleation mechanism; rare earths; PERMANENT-MAGNETS; MECHANISM; CO;

D O I：

10.1016/S1002-0721(10)60300-6

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The effects of Tb addition on the microstructure and magnetic properties of the NdFeB magnets prepared by HD method were investigated by X-ray diffraction (XRD) and BH magnetometers. The results of the microstructure showed that both the Tb-doped and undoped permanent magnets were composed mostly of Tetragonal phase Nd2Fe14B (space group P42/mnm) and a trace amount of Nd-rich phase. Accordingly, addition of Tb led to a decrease of the pole density factor of (004), (006) and (008) crystal plane of the Nd2Fe14B phase calculated by Horta formula, but the coercivity of the magnets increased from 2038 kA/m up to 2302 kA/m as a consequence of Tb addition. The study of the H-c(T)/M-s(T) versus H-N(min)/M-s(T) behavior showed that the nucleation was the dominating mechanism for the magnetization reversal in both sintered magnets, and the microstructural parameters of alpha(k) and N-eff were obtained also. The Kronmuller-plot showed an increase of the alpha(k) responsible for an increase of the coercivity.

引用

页码：399 / 402

页数：4

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