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公开(公告)号:US5194099A
公开(公告)日:1993-03-16
申请号:US466457
申请日:1990-05-23
Applicant: Friedrich Esper , Waldemar Draxler , Gunter Petzow , Andreas Buchel , Klaus-Dieter Durst , Ernst-Theo Henig , Gerhard Schneider , Helmut Kronmuller
Inventor: Friedrich Esper , Waldemar Draxler , Gunter Petzow , Andreas Buchel , Klaus-Dieter Durst , Ernst-Theo Henig , Gerhard Schneider , Helmut Kronmuller
CPC classification number: H01F1/0577 , C22C32/0026
Abstract: A sinter magnet based on Fe-Nd-B with improved coercive field strength and reduced temperature dependency thereof consists of 25 to 50 wt. % Nd, 0.5 to 2 wt. % B, 0 to 5 wt. % Al, 0.5 to 3 wt. % O, remainder Fe and usual impurities and has an oxygen content which is adjusted by the addition of oxygen or of oxygen-containing compounds, especially of an Al and/or Nd oxide, before the dense sintering. It is obtainable by the melting together of the pure components with formation of a pre-alloy, pulverisation of the pre-alloy, alignment of the powder in a magnetic field and pressing to a green formed body, sintering at 1040.degree. to 1100.degree. C. and subsequent annealing at 600.degree. to 700.degree. C., whereby one adds the oxygen as Al or Nd oxide or via the grinding and/or sintering atmosphere.
Abstract translation: PCT No.PCT / EP88 / 00978 Sec。 371日期1990年5月23日 102(e)日期1990年5月23日PCT提交1988年10月28日PCT公布。 第WO89 / 05031号公报 日期:1989年6月1日。具有改善的矫顽场强度和降低温度依赖性的基于Fe-Nd-B的烧结磁体由25至50wt。 %Nd,0.5〜2wt。 %B,0至5wt。 %Al,0.5〜3wt。 %O,余量Fe和通常的杂质,并且具有通过在致密烧结之前加入氧或含氧化合物,特别是Al和/或Nd氧化物来调节的氧含量。 可以通过在预先合金的形成,预合金的粉碎,粉末在磁场中的排列和压制成绿色成形体的情况下,将纯组分熔化在一起,在1040℃〜1100℃烧结 并随后在600℃至700℃退火,由此将氧气作为Al或Nd氧化物或通过研磨和/或烧结气氛加入。