Magnetic properties and microstructures of the Nd-Fe-B magnet powder produced by hydrogen treatment

R. Nakayama; T. Takeshita; M. Itakura; N. Kuwano; K. Oki

doi:10.1063/1.349232

Magnetic properties and microstructures of the Nd-Fe-B magnet powder produced by hydrogen treatment

R. Nakayama, T. Takeshita, M. Itakura, N. Kuwano, K. Oki

Materials Physics and Engineering

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

Abstract

The hydrogen treatment of the Nd-Fe-B alloy ingots was found to produce magnet powders with good magnetic properties. Typical magnetic properties of these powders are as follows; 4πI_s = 9.5 kG, B_r = 7.7 kG, _iHc = 9.4 kOe, and (BH)_max = 12.2 MGOe. Microstructural studies of these powders showed that they are made of fine crystalline grains of ∼0.3 μm diameter and that these crystalline grains in the individual magnet powder are not necessarily enclosed with boundary phase(s), which is quite different from previously known Nd-Fe-B magnets, i.e., the sintered magnet (the nucleation type magnet) or the amorphous ribbon magnet (the pinning type magnet). It is also noted that the size of these crystalline grains is comparable to that of the single magnetic domain of the tetragonal Nd₂Fe₁₄B intermetallic compound and the coercive force of these powders appears to be related to their fine crystalline grain size.

Original language	English
Pages (from-to)	3770-3774
Number of pages	5
Journal	Journal of Applied Physics
Volume	70
Issue number	7
DOIs	https://doi.org/10.1063/1.349232
Publication status	Published - 1991

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Access to Document

10.1063/1.349232

Cite this

@article{2a659c15247742648b734702c99f67da,

title = "Magnetic properties and microstructures of the Nd-Fe-B magnet powder produced by hydrogen treatment",

abstract = "The hydrogen treatment of the Nd-Fe-B alloy ingots was found to produce magnet powders with good magnetic properties. Typical magnetic properties of these powders are as follows; 4πIs = 9.5 kG, Br = 7.7 kG, iHc = 9.4 kOe, and (BH)max = 12.2 MGOe. Microstructural studies of these powders showed that they are made of fine crystalline grains of ∼0.3 μm diameter and that these crystalline grains in the individual magnet powder are not necessarily enclosed with boundary phase(s), which is quite different from previously known Nd-Fe-B magnets, i.e., the sintered magnet (the nucleation type magnet) or the amorphous ribbon magnet (the pinning type magnet). It is also noted that the size of these crystalline grains is comparable to that of the single magnetic domain of the tetragonal Nd2Fe14B intermetallic compound and the coercive force of these powders appears to be related to their fine crystalline grain size.",

author = "R. Nakayama and T. Takeshita and M. Itakura and N. Kuwano and K. Oki",

year = "1991",

doi = "10.1063/1.349232",

language = "English",

volume = "70",

pages = "3770--3774",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "7",

}

TY - JOUR

T1 - Magnetic properties and microstructures of the Nd-Fe-B magnet powder produced by hydrogen treatment

AU - Nakayama, R.

AU - Takeshita, T.

AU - Itakura, M.

AU - Kuwano, N.

AU - Oki, K.

PY - 1991

Y1 - 1991

N2 - The hydrogen treatment of the Nd-Fe-B alloy ingots was found to produce magnet powders with good magnetic properties. Typical magnetic properties of these powders are as follows; 4πIs = 9.5 kG, Br = 7.7 kG, iHc = 9.4 kOe, and (BH)max = 12.2 MGOe. Microstructural studies of these powders showed that they are made of fine crystalline grains of ∼0.3 μm diameter and that these crystalline grains in the individual magnet powder are not necessarily enclosed with boundary phase(s), which is quite different from previously known Nd-Fe-B magnets, i.e., the sintered magnet (the nucleation type magnet) or the amorphous ribbon magnet (the pinning type magnet). It is also noted that the size of these crystalline grains is comparable to that of the single magnetic domain of the tetragonal Nd2Fe14B intermetallic compound and the coercive force of these powders appears to be related to their fine crystalline grain size.

AB - The hydrogen treatment of the Nd-Fe-B alloy ingots was found to produce magnet powders with good magnetic properties. Typical magnetic properties of these powders are as follows; 4πIs = 9.5 kG, Br = 7.7 kG, iHc = 9.4 kOe, and (BH)max = 12.2 MGOe. Microstructural studies of these powders showed that they are made of fine crystalline grains of ∼0.3 μm diameter and that these crystalline grains in the individual magnet powder are not necessarily enclosed with boundary phase(s), which is quite different from previously known Nd-Fe-B magnets, i.e., the sintered magnet (the nucleation type magnet) or the amorphous ribbon magnet (the pinning type magnet). It is also noted that the size of these crystalline grains is comparable to that of the single magnetic domain of the tetragonal Nd2Fe14B intermetallic compound and the coercive force of these powders appears to be related to their fine crystalline grain size.

UR - http://www.scopus.com/inward/record.url?scp=0013019759&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0013019759&partnerID=8YFLogxK

U2 - 10.1063/1.349232

DO - 10.1063/1.349232

M3 - Article

AN - SCOPUS:0013019759

SN - 0021-8979

VL - 70

SP - 3770

EP - 3774

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 7

ER -

Magnetic properties and microstructures of the Nd-Fe-B magnet powder produced by hydrogen treatment

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this