Effect of Cu Addition on the Phase Equilibria in Nd-Fe-B Sintered Magnets

被引：22

作者：

Nishio, Shota ^{[1
]}

Sugimoto, Satoshi ^{[1
,2
]}

Goto, Ryota ^{[2
]}

Matsuura, Masashi ^{[1
,2
]}

Tezuka, Nobuki ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, New Ind Creat Hatchery Ctr NICHe, Sendai, Miyagi 9808579, Japan

来源：

MATERIALS TRANSACTIONS | 2009年 / 50卷 / 04期

关键词：

neodymium-iron-boron magnet; neodymium-rich phase; wettability; sessile drop method; copper; triple junction; PERMANENT-MAGNETS; WETTABILITY; COERCIVITY; ND2FE14B; MICROSTRUCTURE; AL;

D O I：

10.2320/matertrans.MBW200824

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nd-Fe-B sintered magnets show high energy products and have started to be used for motors of hybrid electric vehicles (HE-Vs). For the use of the magnets, the understanding of the coercivity mechanism is required for obtaining, high coercivity. The Nd-rich phase in Nd-Fe-B sintered magnets plays an important role in cleaning the surface of Nd2Fe14B grains for decreasing the number of nucleation sites of reverse domains. which leads to high coercivity. In this study. the phase equilibria including oxygen in Nd-Fe-B sintered magnets are discussed in view of the wettability between Nd-rich phase and Nd2Fe14B phase. It is considered that Cu addition decrease,, the free energy of Nd-rich liquid phase, which leads to the shift of liquidus line of Nd-O system to lower temperature and the increase in solubility limit of oxygen. Due to improvement of wettability and increase in solubility limit. Cu-added Nd-rich liquid spread easily and form homogeneous liquid phase during the sintering process. These phenomena enhance cleaning effect of Nd-rich phase and contribute to the increase in coercivity of Nd-Fe-B sintered magnets. [doi: 10.2320/matertrans.MBW200824]

引用

页码：723 / 726

页数：4

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