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    • 15. 发明授权
    • Magnetic powder and production process thereof
    • 磁粉及其制备方法
    • US4668283A
    • 1987-05-26
    • US746884
    • 1985-06-20
    • Tadatoshi HondaTakeshi Tsuda
    • Tadatoshi HondaTakeshi Tsuda
    • H01F1/057C22C1/04
    • H01F1/0572Y10T428/2991
    • Magnetic powder protected from subsequent oxidation and deterioration can be obtained by effecting contact of starting magnetic powder, which is formed of an intermetallic compound containing a rare-earth metal and an iron-group metal as principal components thereof, with a phosphorus compound containing at least one active proton having a pKa of 4 or smaller and exposure of the starting magnetic powder to an oxygen-containing atmosphere in an arbitrary order or simultaneously. Production of a plastic magnet with the magnetic powder of this invention allows to avoid danger and deterioration in magnetic characteristics of the resulting product due to oxidation of the magnetic powder even if exposed to elevated temperatures during its production or use.
    • 通过使包含稀土金属的金属间化合物和作为其主要成分的铁族金属形成的起始磁性粉末与至少含有磷化合物的磷化合物接触,可以获得保护免受后续氧化和劣化的磁性粉末 一个pKa为4或更小的活性质子,并以起始磁性粉末以任意的顺序或同时暴露于含氧气氛。 使用本发明的磁性粉末制造塑料磁体允许避免由于磁粉的氧化而导致的所得产品的磁特性的危险和劣化,即使在生产或使用过程中暴露于升高的温度下。