05908513 is referenced by 15 patents and cites 12 patents.

The magnetic properties of rare earth magnet are improved by means of forming a novel structure of the cast alloy used for the production of a rare earth magnet, which contains from 27 to 34% by weight of at least one rare earth element (R) including yttrium, from 07 to 1.4% by weight of boron, and the balance being essentially iron and, occasionally any other transition element, and comprises an R.sub.2 T.sub.14 B phase, an R-rich phase and optionally at least one ternary phase except for the R.sub.2 T.sub.14 B phase and the R-rich phase. The novel structure is that the volume fraction (V) in percentage of said R.sub.2 T.sub.14 B phase and said at least one ternary phase is more than 138-1.6r (with the proviso that r is the content of R), the average grain size of the R.sub.2 T.sub.14 B phases is from 10 to 100 .mu.m and, further, the average spacing between the adjacent R-rich phases is from 3 to 15 .mu.m. The novel structure can be formed by by means of feeding alloy melt onto a rotary casting roll, cooling in a temperature range of from melting point to 1000.degree. C. at a cooling rate of 300.degree. C. per second or more, and further cooling in a temperature range of from 800 to 600.degree. C. at a cooling rate of 1.degree. C./second or less.

Title
Cast alloy used for production of rare earth magnet and method for producing cast alloy and magnet
Application Number
8/838784
Publication Number
5908513
Application Date
April 10, 1997
Publication Date
June 1, 1999
Inventor
Yoichi Hirose
Saitama
JP
Hiroshi Hasegawa
Saitama
JP
Shiro Sasaki
Saitama
JP
Agent
Armstrong Westerman Hattori McCleland & Naughton
Assignee
Showa Denko
JP
IPC
H01F 1/057
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