The effects of intrinsic coercivity on the thermal stability of Sm(Co{sub 0.70}Fe{sub 0.21}Cu{sub 0.06}Zr{sub 0.03}){sub 7.6} sintered magnets up to 450{degree}C
- Rhone-Poulenc, Rare Earths and Gallium, CN 7500, Cranbury, New Jersey 08512 (United States)
Sm(Co{sub 0.70}Fe{sub 0.21}Cu{sub 0.06}Zr{sub 0.03}){sub 7.6} sintered magnets with various {ital H}{sub ci} have been prepared by the conventional powder metallurgy method. Five magnets with {ital H}{sub ci} ranging from 15 to 40 kOe (at 25{degree}C) were selected to examine the impact of {ital H}{sub ci} on the irreversible loss and reversible temperature coefficient of induction ({alpha}). Magnets with higher {ital H}{sub ci} and {ital H{sub k}} were found to exhibit lower irreversible losses when heated to 450{degree}C. Unlike the irreversible loss, {alpha} was found to be nearly independent of the {ital H}{sub ci} or {ital H{sub k}}. These trends suggest that the irreversible loss is microstructure related and can be manipulated by process control, while {alpha} is more composition related and is dependent upon the overall chemical composition of the magnet. {ital B{sub r}} of 8.3 kG, {ital H{sub c}} of 2.7 kOe, {ital H}{sub ci} of 3.5 kOe and {ital BH}{sub max} of 6.7 MGOe at 450{degree}C were obtained on a Sm(Co{sub 0.70}Fe{sub 0.21}Cu{sub 0.06}Zr{sub 0.03}){sub 7.6} magnet with a {ital H}{sub ci} of approximately 40 kOe at room temperature. Additional efforts are required to produce magnets which can be utilized at 450{degree}C. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496609
- Report Number(s):
- CONF-961141--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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