| 简介 |
PROBLEM TO BE SOLVED : To provide a compound for bonded magnets which can achieve high fluidity while maintaining high magnetic properties, and a rare-earth bonded magnet having high magnetic properties.
SOLUTION : The compound for bonded magnets is prepared by mixing rare-earth magnetic powder and a resin binder. The rare-earth magnetic powder has an average grain size in a range of 30 to 100 μm, containing the fine powder having grain sizes of 20 μm or smaller in a range of 14 to 45 wt%, and containing the rough powder having grain sizes of 100 μm or larger in a range of 20 to 50 wt%. The resin binder is a polymerized-fatty-acid-based polyamide resin having a number-average molecular weight in a range of 6, 000 to 14, 000, and having a quantity of end functional groups in a range of acid value ≤3 mgKOH/g and amine value ≤3 mgKOH/g. |
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