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New sintered high temperature Sm-Co based permanent magnet materials

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8 Author(s)
Sam Liu ; Magnetic Lab., Dayton Univ., OH, USA ; Jie Yang ; Doyle, G. ; Kuhl, G.E.
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New sintered Sm-Co based permanent magnet materials have been developed to meet the high-temperature (⩾400°C) application requirement of advanced power systems. A magnet of Sm(CobalFe 0.09Cu0.09Zr0.03)7.69 shows an intrinsic coercivity (MHc) approaching 13 kOe and an energy product of 14 MGOe at 400°C. Its second-quadrant induction demagnetization curve is a straight line at temperatures to 500°C. Magnets with improved temperature coefficient of MHc 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(CobalFe0.04Cu0.09Zr0.02) 7.26. Upon heating, the MHc first reached a minimum of 4.4 kOe at 150°C and then gradually increased to a maximum of 7.5 kOe at 500°C

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )