Long-term aging of Sm{sub 2}(Co,Fe,Cu,Zr){sub 17} permanent magnets at 300 and 400 C

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.619595· OSTI ID:566424

Liu, S ^[1]; Hoffman, E P; Brown, J R ^[2]

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1. Univ. of Dayton, OH (United States). Magnetics Lab.
2. Air Force, Wright-Patterson AFB, OH (United States). Aerospace Power Div.

Long-term aging experiments were carried out for Sm{sub 2}(Co,Fe,Cu,Zr){sub 17} permanent magnets at 300 and 400 C and both traditional and application-oriented characterizations were performed. Results of application-oriented characterizations show that the maximum energy product of the magnet at 300 C dropped 10% after aging at 300 C for 9,200 hours. Further, the maximum energy product of the same magnet at 400 C dropped {approximately}43% after aging at 400 C for 4,300 hours. The findings also indicate that the thermal stability of Sm{sub 2}(Co,Fe,Cu,Zr){sub 17} magnets is extremely sensitive to their iron content in the magnet alloys. It is anticipated that the high temperature performance of Sm{sub 2}(Co,Fe,Cu,Zr){sub 17} magnets can be significantly improved by decreasing their iron content.

• OSTI ID: 566424
• Report Number(s): CONF-970468--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 5Pt2 Vol. 33; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
COBALT ALLOYS
COPPER ALLOYS
IRON ALLOYS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
PERMANENT MAGNETS
SAMARIUM ALLOYS
TEMPERATURE DEPENDENCE
ZIRCONIUM ALLOYS