Title:
PARIDLY COOLED ALLOY FOR IRON BASED RARE EARTH ALLOY MAGNET AND METHOD FOR PRODUCING IRON BASED RARE EARTH ALLOY MAGNET
Document Type and Number:
Japanese Patent JP3763774
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a permanent magnet which exhibits high coercive force and magnetization in spite of the low content of rare earth elements, and further has excellent squareness of a demagnetization curve.
SOLUTION: The molten meal of an alloy whose compositional formula is expressed by (Fe1-mTm)100-x-y-zQxRyMz (T is one or more elements selected from the group consisting of Co and Ni; Q is one or more elements selected from the group consisting of B and C; R is one or more rare earth metal elements including Y; and M is at least one element selected from the group consisting of Ti, Zr and Hf), and in which the compositional ratios of (x), (y), (z) and (m) respectively satisfy 10<x<17 at.%, 8≤y≤9.3 at.%, 0.5≤z≤6 at.% and 0≤m≤0.5 is produced. Next, the molten metal of the above alloy is rapidly cooled in an atmospheric gas under the pressure of ≥30 kPa to produce a rapidly cooled alloy containing an R2Fe14B type compound phase having the average particle size of ≤50 nm. Ferromagnetic iron based borides are present in a fine state on the grain boundary of the R2Fe14B type compound phase in a nanocomposite magnet produced from the rapidly cooled alloy.
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Inventors:
Hirokazu Kinsei
Toshio Miyoshi
Satoshi Hirosawa
Yasutaka Shigemoto
Yusuke Shiotani
Toshio Miyoshi
Satoshi Hirosawa
Yasutaka Shigemoto
Yusuke Shiotani
Application Number:
JP2001358767A
Publication Date:
April 05, 2006
Filing Date:
May 18, 2001
Export Citation:
Assignee:
Neomax corporation
International Classes:
B22D11/06; C22C38/00; C21D6/00; H01F1/053; H01F1/057; H01F1/08; (IPC1-7): C22C38/00; B22D11/06; C21D6/00; H01F1/053
Domestic Patent References:
| JP8162312A | ||||
| JP2298003A | ||||
| JP11293418A |
Attorney, Agent or Firm:
Seiji Okuda