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 ℃ were investigated.The results on scanning electron microscopy and X-ray diffraction analysis indicate that the remanence Br of the magnets is mainly influenced by the degree of the easy-axis orientation when sintering temperature is less than 1085 ℃,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 ℃.Moreover,it is found that intrinsic coercivity Hci is strongly related to the content of copper in the matrix of the sintered magnets.The optimal sintering temperature is located in 1025～1055 ℃,the corresponding magnetic properties of the magnets are Br=0.685 T,Hci=350 kA·m-1,and maximum energy product (BH)m=85.6 kJ.m-3.