ANISOTROPIC COMPLEX SINTERED MAGNET COMPRISING MnBi WHICH HAS IMPROVED MAGNETIC PROPERTIES AND METHOD OF PREPARING THE SAME
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United States of America Patent
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May 23, 2019
app pub date -
Jan 25, 2019
filing date -
Jan 25, 2019
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Abstract
The present invention relates to a method of preparing an anisotropic complex sintered magnet having MnBi, that includes: (a) preparing a non-magnetic phase MnBi-based ribbon by a rapidly solidification process (RSP); (b) heat treating the non-magnetic phase MnBi-based ribbon to convert the non-magnetic phase MnBi-based ribbon into a magnetic phase MnBi-based ribbon; (c) grinding the magnetic phase MnBi-based ribbon to form a MnBi hard magnetic phase powder; (d) mixing the MnBi hard magnetic phase powder with a rare-earth hard magnetic phase powder; (e) magnetic field molding the mixture obtained in step (d) by applying an external magnetic field to form a molded article; and (f) sintering the molded article.
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