Title :
Effect of z value on high temperature performance of Sm(Co,Fe,Cu,Zr)z with z=7.14-8.10
Author :
Liu, Sam ; Potts, Gregory ; Doyle, George ; Yang, Jie ; Kuhl, G. Edward ; Chen, Christina ; Walmer, Marlin S. ; Walmer, Michael H.
Author_Institution :
Magnetics Lab., Dayton Univ., OH, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
The effect of z value on the high temperature performance of Sm(Co 0.795Fe0.09Cu0.09Zr0.025) z with effective z=7.14-8.10 was studied up to 600°C. It was observed that the intrinsic coercivity (MHc) was very sensitive to the z value, especially when the temperature was lower than 550°C. Peak values of MHc were observed in the MHc-z curves. As the temperature rose, this peak shifted toward lower values of z. It was observed in this study that a new magnet with the composition of Sm(Co0.795 Fe0.09Cu0.09Zr0.025)7.26 showed maximum energy product more than 20 times higher than the best conventional high temperature 2:17 magnet in a dynamic characterization at 4000°C. The new magnets with low z values and low Fe (high Co)content also displayed excellent long-term stability at 500°C
Keywords :
cobalt alloys; coercive force; copper alloys; ferromagnetic materials; iron alloys; permanent magnets; samarium alloys; zirconium alloys; 550 C; 600 C; Sm(Co,Fe,Cu,Zr)z; Sm(Co0.795Fe0.09Cu0.09Zr 0.025); Sm(Co0.795Fe0.09Cu0.09Zr 0.025)z; high temperature performance; intrinsic coercivity; maximum energy product; z value; Coercive force; Demagnetization; Induction generators; Iron; Magnetic levitation; Magnetic materials; Permanent magnets; Power system stability; Temperature sensors; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
