Bond magnet and manufacturing method thereof, and actuator therewith
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United States of America Patent
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Apr 15, 2003
Grant Date -
Mar 28, 2002
app pub date -
Aug 22, 2001
filing date -
May 19, 1999
priority date (Note) -
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Abstract
A bond magnet comprises a molded body in which a mixture of flake of magnet material comprising rare earth element-iron-nitrogen as main component, TbCu.sub.7 type crystal phase as a principal phase and a thickness of less than 200 .mu.m a binder is compression molded. A compression molded body constituting a bond magnet has a density of 6.times.10.sup.3 kg/m.sup.3 or more. In the step of compression molding a mixture of magnet material and binder, pressure is applied a plurality of times, or pressure is applied while rotating a punch and die, or the binder is cured while applying pressure to obtain such a bond magnet with good reproducibility. Such a bond magnet has excellent magnetic properties and corrosion resistance.
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