Development of high-coercivity nanocomposite permanent magnets based on Nd2Fe14B and FexB

被引：0
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作者：
Hirosawa, Satoshi [1 ]
Kanekiyo, Hirokazu [1 ]
Miyoshi, Toshio [1 ]
Shigemoto, Yasutaka [1 ]
Murakami, Kaichi [1 ]
Senzaki, Yuuka [1 ]
Nishiuchi, Takashi [1 ]
机构：
[1] Research and Development Center, NEOMAX Co., Ltd., 2-15-17 Egawa, Shimamoto-cho, Mishima-gun, Osaka-fu 618-0013, Japan
来源：
Journal of Alloys and Compounds | 1600年 / 408-412卷
关键词：
In a composition range along the tie line between Fe3B and Nd2Fe14B with Nd concentration between approximately 6 and 9 at%; it has been found that addition of a few atomic percent of Ti suppresses formation and growth of γ-iron and promotes the formation of Nd2Fe14B. This lead to development of a new series of nanocomposite permanent magnet materials on the Nd-Fe-B-Ti-C system; for which the strip-casting technique can be applied in the rapid solidification process. The newly developed Nd-Fe-B-Ti-C nanocomposite permanent magnets cover a wide range of magnetic properties and include a high-coercivity grade with coercivity (HcJ) of about 1 MA/m and remanence (Br) of 0. 8 T and a high-remanence grade with HcJ = 500 kA/m and Br = 0.86 T. The high coercivity owes its origin to a larger volume fraction of the hard magnetic Nd2Fe14B phase compared to the previous Fe3B/Nd2Fe14B nanocomposite permanent magnets in which the volume fraction of the Nd2Fe14B phase is limited by disappearance of this phase in Nd concentration range beyond about 5 at%. Resin-bonded magnets fabricated using these powders show excellent stability against oxidation under a humid; high-temperature atmosphere. © 2005 Elsevier B.V. All rights reserved;
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