R-T-B ALLOY, METHOD FOR PRODUCING THE SAME, FINE POWDER FOR R-T-B RARE EARTH PERMANENT MAGNET, AND R-T-B RARE EARTH PERMANENT MAGNET

Title:

R-T-B ALLOY, METHOD FOR PRODUCING THE SAME, FINE POWDER FOR R-T-B RARE EARTH PERMANENT MAGNET, AND R-T-B RARE EARTH PERMANENT MAGNET

Document Type and Number:

Japanese Patent JP2008214747

Kind Code:

A

Abstract:

To provide an R-T-B alloy which can be a raw material for a rare-earth permanent magnet having excellent magnetic characteristics.

The R-T-B alloy contains at least Dy (wherein R represents at least one of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb and Lu; T represents a transition metal containing not less than 80% by mass of Fe; and B represents a compound containing not less than 50% by mass of B and not less than 0% by mass but less than 50% by mass of at least one of C and N). This R-T-B alloy has a main phase such as an R2T14B phase for exhibiting magnetism, an R-rich phase wherein R is concentrated when compared with the composition ratio of the alloy as a whole, and a Dy concentrated region formed near the R-rich phase in which region Dy is concentrated when compared with the composition ratio of the alloy as a whole.

Inventors:

NAKAJIMA KENICHIRO
HASEGAWA HIROSHI

Application Number:

JP2008018041A

Publication Date:

September 18, 2008

Filing Date:

January 29, 2008

Export Citation:

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Assignee:

SHOWA DENKO KK

International Classes:

C22C38/00; B22F1/00; B22F9/04; B22F9/08; C22C33/02; H01F1/053; H01F1/08; H01F41/02

Domestic Patent References:

JPH11315357A	1999-11-16
JP2003226944A	2003-08-15
JP2006310660A	2006-11-09

Foreign References:

WO2003001541A1

2003-01-03

Attorney, Agent or Firm:

Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama

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