The effect of Fe content on the temperature dependent magnetic properties of Sm(Co,Fe,Cu,Zr){sub z} and SmCo{sub 5} sintered magnets at 450 C
- Rhone-Poulenc, Cranbury, NJ (United States)
The magnetic properties of SmCo{sub 5}, Sm(Co{sub bal-}Fe{sub 0.21}Cu{sub 0.06}Zr{sub 0.03}){sub 7.6}, Sm(Co{sub bal}Fe{sub 0.25}Cu{sub 0.06}Zr{sub 0.03}){sub .6}, Sm (Co{sub bal}Fe{sub 0.28}Cu{sub 0.06}Zr{sub 0.02}){sub 7.6}, sintered magnets have been measured up to 350, 400 and 450 C. For a fixed temperature range, the irreversible loss of Sm(Co, Fe, Cu, Zr){sub z} magnets has been found to increase with increasing Fe content. Despite the high B{sub r} obtained at 25 C, a magnet must have a low irreversible loss of induction to retain a high magnetization after thermal cycling. Compromising the B{sub r} of 11.3 kG obtained at 25 C and the irreversible loss of 1.9% after thermal cycling to 450 C, a magnet with the composition of the Sm(Co{sub bal-}Fe{sub 0.21}Cu{sub 0.06}Zr{sub 0.03}){sub 7.6} was found to exhibit the highest retained magnetization among the magnets studied. This magnet also exhibited the highest H{sub cl} (2.8 kOe) and BH{sub max} (6.7 MGOe) at 450 C among all magnets studied. The reversible temperature coefficients of induction of Sm(Co, Fe, Cu, Zr){sub z} sintered magnets were found to be about{minus}0.03 to {minus}0.04%/C, while those of SmCo{sub 5} magnet were about {minus}0.05%/C.
- OSTI ID:
- 400765
- Report Number(s):
- CONF-960425--
- Journal Information:
- IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 5Pt2 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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