Alloy for Fe Nd B type permanent magnet, sintered permanent magnet and process for obtaining it
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United States of America Patent
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Jun 23, 1992
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N/A
app pub date -
Nov 26, 1990
filing date -
Dec 1, 1989
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Expired
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Abstract
The invention relates to Fe Nd B type alloys for permanent magnets, the permanent magnets thus obtained and a method of producing them. They have high magnetic characteristics with good temperature resistance and good resistance to atmospheric corrosion. They comprise, in at%, 12 to 18% of rare earths, 3 to 30% of Co, 5.9 to 12% of B, 2 to 10% of V, some Al and Cu, the remainder being iron and unavoidable impurities. The V can be substituted by other refractory elements (Nb, W, Cr, Mo, Ti, Zr, Hf, Ta). The method mainly involves sintering at between 1050 and 1110.degree. C. followed by annealing at between 850 and 1050.degree. C. and/or artificial ageing at between 560.degree. C. and 850.degree. C.
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