Sintered rare earth metal-boron-iron alloy magnets and a method for their production
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United States of America Patent
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Sep 15, 1992
Grant Date -
N/A
app pub date -
Feb 2, 1990
filing date -
Jun 3, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides sintered rare earth metal-boron-iron alloy magnets having superior anti-corrosion properties in which the magnetic properties do not deteriorate with time obtained by adding at least one oxide powder chosen from the group including Al, Ga, Ni, Co, Mn, Cr, Ti, V, Nb, Y, Ho, Er, Tm, Lu, as well as Eu, as well as at least one hydride powder chosen from the group including Zr, Ta, Ti, Nb, V. Hf, and Y in an amount totalling from 0.0005 to 3.0 weight % to a R-B-Fe alloy powder; molding; sintering; and then carrying out heat treatment as necessary.
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