发明名称 RARE EARTH IRON PERMANENT MAGNET
摘要 PURPOSE:To obtain a rare earth iron permanent magnet having high performance and low cost by hot-working a cast ingot of specific alloy at specific temperature to make crystal grains fine and orienting the crystal axis in a specific direction to be subjected to a magnetic anisotropy. CONSTITUTION:Alloy which contains 8-30 atomic % of R, 2-28 atomic % of B, 50 atomic 5 or less of Co, 15 atomic % of Al, 8 atomic % or less of additive element M (one or more of Mg, Ca, Sr, Ba, and Be), the residue of iron and other impurities unavoidable in manufacture is melted and cast. The cast ingot is then hot-worked at 500 deg.C or higher to make crystal grains fine, its crystal axis is oriented in a specific direction to subject the cast alloy to a magnetic anisotropy. Thus, coercive force can be obtained only by a heat treatment without pulverizing the ingot, the hot working may be conducted only by one stage process, and the steps can be simplified.
申请公布号 JPS63213317(A) 申请公布日期 1988.09.06
申请号 JP19870047044 申请日期 1987.03.02
申请人 SEIKO EPSON CORP 发明人 KOBAYASHI OSAMU;AKIOKA KOJI;SHIMODA TATSUYA
分类号 C21D8/00;C22C38/00;H01F1/053;H01F1/057 主分类号 C21D8/00
代理机构 代理人
主权项
地址