Magnetic properties of sintered permanent magnets R-Fe-Cu-B (R=Prand Nd)

Rare earth permanent magnets are essential components in many fields of technology due to their excellent magnetic properties. There are some techniques used in the manufacture of permanent rare earth magnets: the powder metallurgy to obtain anisotropic HD sintered permanent magnets and the melt spinning and HDDR processes to obtain isotropic and anisotropic bonded permanent magnets. In this work, the influence of the melt spinning parameters on the microstructural and magnetic properties of the Pr14FebalCo16B6 alloy was studied. The alloy was melted and rapidly cooled at 9.9 x 105°C/s. The parameters used in the process were: wheel speed of 15 m/s and 20 m/s and ejection pressure of 25.3 kPa and 50.7 kPa. Ribbons and/or flakes of 30 μm thickness and width until 5 mm were obtained. Results show that the melt spinning alloys are nanocrystalline and that the parameters of the process influence the microstructure and their magnetic properties. Mean crystallite size up to 38.5 nm and intrinsic coercivity (iHc) up to 254 kA/m were obtained.

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Effect of heat treatment modes on the structure and magnetic properties of sintered permanent magnets based on Sm(Co, Fe, Cu, Zr) Z

Metal Science and Heat Treatment ◽

10.1007/s11041-013-9580-1 ◽

2013 ◽

Vol 55 (1-2) ◽

pp. 63-67

Author(s):

O. A. Arinicheva ◽

A. S. Lileev ◽

M. Reissner ◽

A. G. Dormidontov

Keyword(s):

Heat Treatment ◽

Magnetic Properties ◽

Permanent Magnets ◽

Sintered Permanent Magnets

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Magnetic properties on sintered permanent magnets R-Fe-Cu-B (R=Pr, Nd)

IEEE Transactions on Magnetics ◽

10.1109/20.104813 ◽

1990 ◽

Vol 26 (5) ◽

pp. 2607-2609 ◽

Cited By ~ 10

Author(s):

C.H. Lin ◽

C.J. Chen ◽

C.D. Wu ◽

W.C. Chang ◽

S.K. Chen ◽

...

Keyword(s):

Magnetic Properties ◽

Permanent Magnets ◽

Sintered Permanent Magnets

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Effect of heat treatment on the microstructure and magnetic properties of niobium-containing (Nd, Dy)-(Fe, Co)-B sintered permanent magnets

Journal of the Less Common Metals ◽

10.1016/0022-5088(90)90429-n ◽

1990 ◽

Vol 158 (1) ◽

pp. 41-49 ◽

Cited By ~ 10

Author(s):

G.F Zhou ◽

Y.C Chuang ◽

X.K Sun ◽

R Grössinger ◽

H.R Kirchmayr

Keyword(s):

Heat Treatment ◽

Magnetic Properties ◽

Permanent Magnets ◽

Sintered Permanent Magnets ◽

Microstructure And Magnetic Properties

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Aluminum Substitutions in Nd-Fe-B Sintered Magnets

MRS Proceedings ◽

10.1557/proc-96-221 ◽

1987 ◽

Vol 96 ◽

Cited By ~ 3

Author(s):

J. K. Chen ◽

G. Thomas

Keyword(s):

Magnetic Properties ◽

Grain Boundaries ◽

Permanent Magnets ◽

Rich Phase ◽

Sintered Magnets ◽

Sintered Permanent Magnets

ABSTRACTA microstructural and microanalytical study of aluminum substituted Nd-Fe-B sintered permanent magnets were carried out to determine the effect, if any, of aluminum on structure, composition, and magnetic properties, particularly on the observed increase in coercivity. It was found that Al enrichment occurred in the Nd-rich phase at the grain boundaries. The possible role(s) of this enrichment on the observed coercivity increase are discussed.

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