Microstructures and magnetic properties of Ce32.15Co49.36Cu9.84Fe9.65 magnet sintered at different temperatures

The microstructures and magnetic properties of Ce32.15Co49.36Cu9.84Fe9.65 magnet sintered at the temperatures ranging from 1005 to 1105 A degrees C were investigated. The results on scanning electron microscopy and X-ray diffraction analysis indicate that the remanence B (r) of the magnets is mainly influenced by the degree of the easy-axis orientation when sintering temperature is less than 1085 A degrees C, the rapidly increasing amount of the secondly phase (5:19 phase) gives rise to the deterioration of the magnetic properties of the magnet above 1085 A degrees C. Moreover, it is found that intrinsic coercivity H (ci) is strongly related to the content of copper in the matrix of the sintered magnets. The optimal sintering temperature is located in 1025 similar to 1055 A degrees C, the corresponding magnetic properties of the magnets are B (r)=0.685 T, H (ci)=350 kA center dot m(-1), and maximum energy product (BH)(m)=85.6 kJ center dot m(-3).