Anisotropic Nd-Fe-B melt-spun magnets

Author

Yamasaki, J. ; Furuta, A. ; Hirokado, Y.

Author_Institution

Dept. of Electr. Eng., Kyuchu Inst. of Tech., Japan

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

4120

Lastpage

4122

Abstract

The effect of quench rate in terms of the circumferential wheel speed and temperature of the melt when ejected on crystallographic orientation were studied for Nd-Fe-B melt-spun magnets. It was found that the temperature of the melt (T_m) is the dominant parameter affecting the preferred orientation of the tetragonal Nd₂Fe₁₄B compounds. When T_m was increased up to 1400°C, it was confirmed by X-ray diffractometry that the c-axis was oriented normal to the ribbon plane on the free surface. The c-axis orientation was also available on the directly quenched wheel surface by increasing the T_m up to 1600°C. Both surfaces of these ribbons exhibited maze domain patterns due to c-axis orientation. Magnetic measurements revealed that the remanence measured in the direction normal to the ribbon plane was small compared to expected values, which is presumably because of the coarse grain size due to the high T_m

Keywords

X-ray diffraction examination of materials; boron alloys; crystal orientation; ferromagnetic properties of substances; iron alloys; magnetisation; melt spinning; neodymium alloys; permanent magnets; remanence; Nd-Fe-B; X-ray diffractometry; anisotropic melt-spun magnets; c-axis orientation; circumferential wheel speed; crystallographic orientation; grain size; magnetisation; maze domain patterns; melt temperature; permanent magnets; quench rate; remanence; Anisotropic magnetoresistance; Crystallography; Iron; Magnetic variables measurement; Magnets; Neodymium; Remanence; Temperature; Wheels; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42541

Filename

42541