R-T-B based permanent magnet material alloy and R-T-B based permanent magnet
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United States of America Patent
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Issued Date -
May 12, 2005
app pub date -
Oct 6, 2004
filing date -
Oct 15, 2003
priority date (Note) -
Abandoned
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Abstract
An R-T-B based permanent magnet material alloy according to the present invention is an alloy in the shape of a thin plate including R.sub.2T.sub.14B columnar crystals and R-rich phases (where R is at least one of the rare-earth elements including Y, T is Fe with or without at least one nonferrous transition metal element, and B is boron with or without carbon). In a structure of the alloy as viewed on an arbitrary cross section including a normal to the thin plate, the ratio of the combined area of some of the R-rich phases, which have aspect ratios of 10 or more and the major axes of which define angles of 90.+-.30 degrees with respect to the surface of the thin plate, to the overall area of the R-rich phases included in the alloy is at least 30%.
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