SINTERED MAGNET PRODUCTION METHOD
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United States of America Patent
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Oct 6, 2016
app pub date -
Mar 10, 2014
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Mar 25, 2013
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Abstract
A sintered magnet production method includes filling the cavity of a container with an alloy powder of a raw material for a sintered magnet, orienting the alloy powder in the cavity by applying an magnetic field to the alloy powder without applying a mechanical pressure, and sintering the oriented alloy powder by heating the alloy powder without applying a mechanical pressure. The median D50 of a particle size distribution of the alloy powder measured by a laser diffraction method is 3 μm or less, and a powder of a high-melting-point material having a higher melting point than the heating temperature in the sintering process is mixed in the alloy powder before or in the filling process. The median D50 of the powder of the high-melting-point material is 0.3 μm or less.
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