Original document(15 pages) Authorized document(15 pages) 中文版
    Disclosed is a novel thin ribbon of a rare earth/iron/boron-based magnet alloy prepared by quenching of an alloy melt by the method of strip casting, from which a sintered permanent magnet is obtained by the powder metallurgical method. The sintered permanent magnet can be imparted with greatly improved magnetic properties or, in particular, residual magnetic flux density when the thin alloy ribbon as the base material thereof has a metallographic phase structure containing 'four-phase regions' consisting of (a) an alpha-iron phase, (b) a R-rich phase, in which R is a rare earth element selected from praseodymium, neodymium, terbium and dysprosium, (c) a RxT4B4 phase, in which T is iron or a combination of iron and a transition metal element other than iron and rare earth elements and x is a positive number varying with the rare earth element, and (d) a R2T14B phase, in which R and T each have the same meaning as defined above, each phase being dispersed with a grain diameter in a limited range, in a volume fraction of from 1 to 10%.
Application Number
00104690 Application Date
Title 名称 Rear earth/Fe/Boron base magnet alloy fast quenching thin strap
Publication Number
1267744 Publication Date
Approval Pub. Date 2003.04.23 Granted Pub. Date 2003.04.23
International Classification 分类号 C22C38/16;H01F1/053;H01F1/057
Applicant(s) Name
Shin-Etsu Chemical Co., Ltd.
Address 地址
Inventor(s) Name 发明人 Hirota Koichi;Minowa Takehisa;Hashimoto Takahiro
Attorney & Agent 代理人 duan chengen

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