发明名称
摘要 PURPOSE:To easily produce the alloy powder of rare earth system for a permanent magnet having excellent magnetic characteristics by subjecting alloy powder having a specific compsn. consisting of rare earth elements, iron family elements and Ti, etc., to a heating treatment in gaseous H2 from a hydrogen storage material. CONSTITUTION:The cast ingot of the alloy consisting of 7 to 9at.% R (R: rare earth elements contg. >=50% Pr or Nd), 67 to 90.5% T (T: Fe or <=50% thereof is substd. with Co, Ni), 3.5 to 17% M (M: Ti, V, Cr, Mo) is roughly pulverized. The roughly pulverized powder having 50 to 500mum average grain size and >=80% tetragonal structure ThMn12 type compd. is obtd. This powder is held for 30 minutes to 8 hours at 500 to 900 deg.C in gaseous H2 kept at 10 to 1000kPa and is then subjected to an H2 removal treatment at <=10Pa partial pressure. The hydrogen storage material is used as the main supply source for the above- mentioned gaseous H2 at this time. The resulted powder of 0.05 to 1mum is held for 30 minutes to 6 hours at 300 to 600 deg.C in the gaseous N2 of 50 to 5000kPa, by which 0.8 to 8% N is incorporated therein and the alloy powder of rare earth system for a permanent magnet is stably obtd.
申请公布号 JP2838616(B2) 申请公布日期 1998.12.16
申请号 JP19910355885 申请日期 1991.12.20
申请人 SUMITOMO TOKUSHU KINZOKU KK 发明人 TOMIZAWA HIROYUKI;HIROZAWA SATORU
分类号 B22F1/02;B22F9/04;C22C38/00;C23C8/02;C23C8/26;H01F1/053;H01F1/055;H01F1/06 主分类号 B22F1/02
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