Chemical composition and coercivity of SmCo5 magnets

Abstract

The effects of alloy composition and heat treatment on the intrinsic coercivity H-i(c) of SmCo5 magnets were studied. Alloys having six chemical compositions near that of stoichiometric SmCo5 were used to produce magnets via the usual powder metallurgy techniques. Magnets were either as sintered (1150 degrees C) or sintered (1150 degrees C) and treated at 850 degrees C. The substantial increase in H-i(c) due to the 850 degrees C heat treatment occurs reversibly and with a negligible change in lattice parameters Curie temperature T-c and anisotropy held H-A. Quantitative metallography and thermomagnetic measurements showed that the microstructural constituent present in addition to the SmCo5 phase in hyperstoichiometric alloys is composed of both the Sm2Co7 phase and the Sm5Co19 phase. Measurements of magnetization in de magnetic fields up to 33 T suggest that H-A is around 53 T, considerably higher than previously reported values. The coercivity of the magnets is discussed in terms of thermal equilibrium populations of lattice defects. (C) 1998 American Institute of Physics.