PERMANENT MAGNET AND METHOD FOR MANUFACTURING PERMANENT MAGNET
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United States of America Patent
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Issued Date -
Oct 9, 2014
app pub date -
Sep 25, 2012
filing date -
Sep 30, 2011
priority date (Note) -
Abandoned
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Abstract
In a permanent magnet and a manufacturing method thereof, entire magnet can be densely sintered without a gap between a main phase and a grain boundary phase. Fine powder of milled neodymium magnet is mixed with a solution containing an organometallic compound expressed with a structural formula, M-(OR)X, wherein M represents Cu, Al, Dy, Tb, V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, and X represents an arbitrary integer, to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. The magnet powder is desiccated and then held for several hours in hydrogen atmosphere at a pressure higher than normal atmospheric pressure, at 200-900 degrees Celsius for calcination process in hydrogen. The calcined powder after calcination process in hydrogen is held for several hours in vacuum at 200-600 degrees Celsius for dehydrogenation process.
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