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 ({ge}400 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 C. Its second-quadrant induction demagnetization curve is a straight line at temperatures to 500 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 {sub M}H{sub c} 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 C and then gradually increased to a maximum of 7.5 kOe at 500 C.
- Research Organization:
- Univ. of Dayton Magnetics Lab., OH (US)
- OSTI ID:
- 20000764
- Journal Information:
- IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers), Vol. 35, Issue 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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