| 简介 |
PROBLEM TO BE SOLVED : To provide a rare-earth magnet having a protective layer exhibiting excellent heat resistance and toughness, and thereby less likely to be oxidized.
SOLUTION : A rare-earth magnet 10 includes a protective layer 12 formed on the surface of the rare-earth magnet body 11. The protective layer 12 is formed by dispersing flakes 16 having a higher hardness and a melting point of 200°C or more into the solid base materials 15A, 15B of alkaline silicate. Since the base materials 15A, 15B have high toughness, progress of crack is blocked in the protective layer 12, even if it is cracked. Consequently, crack does not penetrate the protective layer 12, and oxidization of the rare-earth magnet body 11 due to intrusion of air or water thereinto can be prevented.
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