Microstructure and magnetic properties of SmCo5 sintered magnets.

SmCo₅ sintered magnets with good thermal stability are mainly used in high-temperature field. In this study, two types of SmCo_z powders with different nominal z values were mixed and synthesized into SmCo₅ magnets by the traditional powder metallurgy method. The magnetic properties of the SmCo₅ sintered magnet are maximum energy product of (BH)_max = 172.29 kJ·m⁻³, remanence of B_r = 7.47 × 10⁵ A·m⁻¹ and coercivity of H_ci = 2.42 T. The results show that there are three coexisting phases in the magnet, which are SmCo₅ phase, Sm₂Co₇ phase and Sm₂O₃ phase. The microstructural observation indicates that the average grain size in the magnet is about 8 μm, and the high coercivity of this magnet is attributed to these fine grains. X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) results indicate that the magnet has a well-aligned (00l) orientation texture. [ABSTRACT FROM AUTHOR]