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

• Published in: Rare metals Vol. 31; no. 5; pp. 470 - 473
• Main Authors: Sun, Wei, Zhu, Minggang, Fang, Yikun, Pan, Wei, Li, Jiajie, Li, Yanfeng, Li, Wei
• Format: Journal Article
• Language: English
• Published: Springer Berlin Heidelberg Nonferrous Metals Society of China 01.10.2012; Division of functional Materials, Central Iron and Steel Research Institute Group, Beijing 100081, China
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; sintering temperature; Ce-Co permanent magnet; coercivity
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-012-0541-4

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.