Long-term aging experiments were carried out for Smz(Co,Fe,Cu,Zr),, permanent magnets at 300 and 4OOOC and both traditional and application-oriented characterizations were performed.Results of application-oriented characterizations show that the maximum energy product of the magnet at 3OOOC dropped -10% after aging at 3OOOC for 9,200 hours. Further, the maximum energy product of the same magnet at 4OOOC dropped -43% after aging at 4OOOC for 4,300 hours. The findings also indicate that the thermal stability of Smz(Co,Fe,Cu,Zr),, magnets is extremely sensitive to their iron content in the magnet alloys. It is anticipated that the high temperature performance of Sm,(Co,Fe,Cu,Zr),, magnets can be significantly improved by decreasing their iron content.
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