New sintered high temperature Sm-Co based permanent magnet materials

New sintered Sm-Co based permanent magnet materials have been developed to meet the high-temperature (/spl ges/400/spl deg/C) application requirement of advanced power systems. A magnet of Sm(Co/sub bal/Fe/sub 0.09/Cu/sub 0.09/Zr/sub 0.03/)/sub 7.69/ shows an intrinsic coercivity (/sub M/H/sub c/) a...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1999-09, Vol.35 (5), p.3325-3327
Main Authors: Liu, Sam, Yang, Jie, Doyle, George, Kuhl, G. Edward, Chen, Christina, Waltner, Marlin, Walmer, Michael, Simon, Gerard
Format: Article
Language:English
Subjects:
Applied sciences
COBALT ALLOYS
COERCIVE FORCE
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER ALLOYS
Crystalline materials
Demagnetization
Exact sciences and technology
Heating
Iron
IRON ALLOYS
Laboratories
Magnetic anisotropy
Magnetic materials
MAGNETIC PROPERTIES
Magnetic properties and materials
MATERIALS SCIENCE
Metals. Metallurgy
PERMANENT MAGNETS
Perpendicular magnetic anisotropy
Physics
SAMARIUM ALLOYS
Saturation magnetization
Sintering
Straight lines
Studies of specific magnetic materials
TEMPERATURE DEPENDENCE
Temperature sensors
ZIRCONIUM ALLOYS
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Summary:New sintered Sm-Co based permanent magnet materials have been developed to meet the high-temperature (/spl ges/400/spl deg/C) application requirement of advanced power systems. A magnet of Sm(Co/sub bal/Fe/sub 0.09/Cu/sub 0.09/Zr/sub 0.03/)/sub 7.69/ shows an intrinsic coercivity (/sub M/H/sub c/) approaching 13 kOe and an energy product of 14 MGOe at 400/spl deg/C. Its second-quadrant induction demagnetization curve is a straight line at temperatures to 500/spl deg/C. Magnets with improved temperature coefficient of /sub M/H/sub c/ have been obtained by reducing the Fe content and increasing the Sm content. An abnormal and complex temperature dependence of MIE was observed in sintered Sm(Co/sub bal/Fe/sub 0.04/Cu/sub 0.09/Zr/sub 0.02/)/sub 7.26/. Upon heating, the /sub M/H/sub c/ first reached a minimum of 4.4 kOe at 150/spl deg/C and then gradually increased to a maximum of 7.5 kOe at 500/spl deg/C.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.800513