Title :
The effect of Fe on the temperature dependent magnetic properties of Sm(Co,Fe,Cu,Zr)z and SmCo5 sintered magnets at 450°C
Author :
Ma, B.M. ; Liang, Y.L. ; Patel, J. ; Scott, D. ; Bounds, C.O.
Author_Institution :
Rhone-Poulenc, Rare Earths & Gallium, Cranbury, NJ, USA
fDate :
9/1/1996 12:00:00 AM
Abstract :
The magnetic properties of SmCo5, Sm(Cobal.Fe0.21Cu0.06Zr0.03) 7.6, Sm(CobalFe0.25Cu0.06Zr 0.03)7.6, Sm(CobalFe0.28Cu 0.06Zr0.02)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)z magnets has been found to increase with increasing Fe content, Despite the high B, obtained at 25°C, a magnet must have a low irreversible loss of induction to retain a high magnetization after thermal cycling. Compromising the Br 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(Cobal.Fe0.21Cu0.6Zr0.03) 7.6 was found to exhibit the highest retained magnetization among the magnets studied. This magnet also exhibited the highest Hci (2.8 kOe) and BHmax (6.7 MGOe) at 450°C among all magnets studied. The reversible temperature coefficients of induction of Sm(Co,Fe,Cu,Zr)2 sintered magnets were found to be about -0.03 to -0.04%/°C, while those of SmCo5 magnet were about 0.05%/°C
Keywords :
cobalt alloys; copper alloys; demagnetisation; ferromagnetic materials; iron alloys; magnetic leakage; permanent magnets; samarium alloys; sintering; zirconium alloys; (null); 25 C; 350 C; 400 C; 450 C; Sm(Co,Fe,Cu,Zr)z sintered magnets; Sm(Cobal.Fe0.21Cu0.06Zr0.03 )7.6; Sm(CobalFe0.25Cu0.06Zr0.03 )7.6; Sm-Co-Fe-Cu-Zr; SmCo5; SmCo5 sintered magnets; irreversible loss; reversible temperature coefficients of induction; temperature dependent magnetic properties; thermal cycling; Iron; Loss measurement; Magnetic losses; Magnetic properties; Magnetization; Magnets; Samarium; Temperature dependence; Temperature distribution; Temperature measurement;
Journal_Title :
Magnetics, IEEE Transactions on
