Title:
METHOD FOR PRODUCING ALLOY CAST SLAB FOR RARE EARTH SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2012/002531
Kind Code:
A1
Abstract:
Disclosed are: an alloy cast slab for a rare earth sintered magnet, which has high rare earth component yield between before and after pulverization, while having uniform particle size after pulverization; and a method which is capable of commercially producing the alloy at high energy efficiency. The production method comprises: a step (A) for preparing an alloy melt that contains B, Fe and R that is composed of at least one element selected from rare earth metal elements including Y or alternatively contains Fe and at least one element selected from among transition metal elements other than Fe, Si and C, with the balance made up of M; a step (B) for quenching and solidifying the alloy melt to a temperature range of 700-1,000˚C (inclusive) by a strip casting method using a cooling roll; and a step (C) for heating and maintaining an alloy cast slab, which is separated from the cooling roll by the quenching and solidification of the step (B), within a specific temperature range before the alloy cast slab is cooled to 500˚C or less. By the production method, an alloy cast slab that has a composition containing 27.0-33.0% by mass of R and 0.90-1.30% by mass of boron with the balance made up of M is obtained.
Inventors:
ONIMURA Takuya (14-34 Fukae-Kitamachi 4-chome, Higashinada-ku, Kobe-sh, Hyogo 13, 〒6580013, JP)
鬼村 拓也 (〒13 兵庫県神戸市東灘区深江北町４丁目１４番３４号 株式会社三徳内 Hyogo, 〒6580013, JP)
鬼村 拓也 (〒13 兵庫県神戸市東灘区深江北町４丁目１４番３４号 株式会社三徳内 Hyogo, 〒6580013, JP)
Application Number:
JP2011/065171
Publication Date:
January 05, 2012
Filing Date:
July 01, 2011
Export Citation:
Assignee:
SANTOKU CORPORATION (14-34, Fukae-Kitamachi 4-chome Higashinada-ku, Kobe-sh, Hyogo 13, 〒6580013, JP)
株式会社三徳 (〒13 兵庫県神戸市東灘区深江北町４丁目１４番３４号 Hyogo, 〒6580013, JP)
ONIMURA Takuya (14-34 Fukae-Kitamachi 4-chome, Higashinada-ku, Kobe-sh, Hyogo 13, 〒6580013, JP)
株式会社三徳 (〒13 兵庫県神戸市東灘区深江北町４丁目１４番３４号 Hyogo, 〒6580013, JP)
ONIMURA Takuya (14-34 Fukae-Kitamachi 4-chome, Higashinada-ku, Kobe-sh, Hyogo 13, 〒6580013, JP)
International Classes:
B22D11/06; B22D11/00; B22F9/04; C21D6/00; C22C38/00; H01F1/053
Attorney, Agent or Firm:
SAKAI Hajime et al. (Nihon Jitensha Kaikan, 9-15 Akasaka 1-chome, Minato-k, Tokyo 52, 〒1070052, JP)
Claims:
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