Rare earth sintered magnet and method for production thereof
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United States of America Patent
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Issued Date -
Oct 6, 2005
app pub date -
Sep 10, 2004
filing date -
Jun 13, 2002
priority date (Note) -
Abandoned
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Abstract
A rare-earth sintered magnet with excellent corrosion resistance and sinterability and a method for producing such a magnet are provided. The rare-earth sintered magnet includes an R.sub.2T.sub.14Q type tetragonal compound (where R is at least one rare-earth element, T is at least one transition metal element always including Fe, and Q is boron and/or carbon) as a main phase and a grain boundary phase surrounding the main phase. The R.sub.2T.sub.14Q type tetragonal compound as the main phase includes Cr, which substitutes for a portion of Fe, and carbon, which substitutes for a portion of boron, as respective essential elements. The concentration of carbon in the main phase is higher than that of carbon in the grain boundary phase.
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