Alloy for Fe Nd B type permanent magnet, sintered permanent magnet and
process for obtaining it
    1.
    发明授权
    Alloy for Fe Nd B type permanent magnet, sintered permanent magnet and process for obtaining it 失效
    适用于有限责任公司的永磁电机,烧结永磁体及其制造工艺

    公开(公告)号:US5123979A

    公开(公告)日:1992-06-23

    申请号:US617648

    申请日:1990-11-26

    摘要: The invention relates to Fe Nd B type alloys for permanent magnets, the permanent magnets thus obtained and a method of producing them.They have high magnetic characteristics with good temperature resistance and good resistance to atmospheric corrosion.They comprise, in at%, 12 to 18% of rare earths, 3 to 30% of Co, 5.9 to 12% of B, 2 to 10% of V, some Al and Cu, the remainder being iron and unavoidable impurities. The V can be substituted by other refractory elements (Nb, W, Cr, Mo, Ti, Zr, Hf, Ta).The method mainly involves sintering at between 1050 and 1110.degree. C. followed by annealing at between 850 and 1050.degree. C. and/or artificial ageing at between 560.degree. C. and 850.degree. C.

    摘要翻译: 本发明涉及用于永磁体的Fe Nd B型合金,由此获得的永磁体及其制造方法。 它们具有高磁特性,耐温性好,耐大气腐蚀性好。 它们以%计含有12至18%的稀土,3至30%的Co,5.9至12%的B,2至10%的V,一些Al和Cu,其余为铁和不可避免的杂质。 V可以被其他难熔元素(Nb,W,Cr,Mo,Ti,Zr,Hf,Ta)取代。 该方法主要包括在1050和1110℃之间进行烧结,然后在850至1050℃之间进行退火和/或在560℃至850℃之间的人工时效。

    Fe-Re-B type magnetic powder, sintered magnets and preparation method
thereof
    3.
    发明授权
    Fe-Re-B type magnetic powder, sintered magnets and preparation method thereof 失效
    Fe-Re-B型磁粉,烧结磁体及其制备方法

    公开(公告)号:US5482575A

    公开(公告)日:1996-01-09

    申请号:US160652

    申请日:1993-12-02

    摘要: A magnetic powder for the manufacture of sintered magnets of the RE-T-B family, where RE represents at least one rare earth, T represents at least one transition element and B represents boron, the powder possibly containing other minor elements, is constituted by a mixture of two powders (A) and (B):a) Powder (A) consists of grains with a quadratic structure RE.sub.2 T.sub.14 B, T being mainly iron with Co/Fe

    摘要翻译: 用于制造RE-TB族烧结磁体的磁粉,其中RE表示至少一种稀土,T表示至少一种过渡元素,B表示硼,可能含有其它次要元素的粉末由混合物 的两种粉末(A)和(B):a)粉末(A)由具有二次结构RE2T14B的晶粒组成,T主要是Co / Fe <8%的铁,并且可能含有高达0.5%的Al 至少0.05%的Cu和至少4%的V族,Nb,Hf,Mo,Cr,Ti,Zr,Ta,W和不可避免的杂质中的至少一种元素,Fisher粒度在3.5至5μm之间 ; b)粉末(B)富含RE,含有Co,并且具有以下重量组成:RE 52-70%,包含至少40%(绝对值)的一种或多种轻稀土,选自 La,Ce,Pr,Nd,Sm,Eu; 氢含量(重量ppm)大于130%的RE; Co 20-35%; Fe 0-20%; B

    Method of protecting magnetic powders and densified permanent magnets of
the Fe Nd B type from oxidation and atmospheric corrosion
    4.
    发明授权
    Method of protecting magnetic powders and densified permanent magnets of the Fe Nd B type from oxidation and atmospheric corrosion 失效
    保护Fe Nd B型磁粉和致密永磁体免受氧化和大气腐蚀的方法

    公开(公告)号:US5411603A

    公开(公告)日:1995-05-02

    申请号:US162292

    申请日:1993-12-07

    CPC分类号: H01F41/026 H01F1/0572

    摘要: The invention concerns a method of protecting magnetic powders and permanent magnets containing at least one rare earth, at least one transition metal and boron from oxidation and atmospheric corrosion, by the introduction of gaseous fluorine during the grinding of the powders. It is characterized in that the fluorine is introduced by a mixture of F.sub.2 +N.sub.2 during the fine grinding of the powders, the mixture containing from 1 to 100 ppm (by volume) of fluorine, and preferably from 1 to 10 ppm. The powders thus obtained are far less reactive and the densified magnets are far more resistant to atmospheric corrosion than non fluorinated powders and magnets obtained therefrom.

    摘要翻译: 本发明涉及通过在研磨粉末期间引入气态氟来保护含有至少一种稀土,至少一种过渡金属和硼的氧化和大气腐蚀的磁粉和永磁体的方法。 其特征在于,在粉末的细粉碎期间,通过F2 + N2的混合物引入氟,该混合物含有1〜100ppm(体积)的氟,优选为1〜10ppm。 由此获得的粉末的反应性低得多,并且致密化的磁体比非氟化粉末和从其获得的磁体更耐大气腐蚀。