MICROSTRUCTURE AND MAGNETIC CHARACTERISTICS OF DUAL PHASE Nd_2(Fe,Co)_(14)B AND Nd_2(Fe,Co)_(17) HDDR COERCIVE POWDER
Nd2（Fe,Co）14B／Nd2（Fe,Co）17双相HDDR磁粉的微观结构和磁特性

The microstructure and magnetic properties of coercive powder prepared by hydrogenation disproportionation desorption recombination method (HDDR) and composed of dual phase Nd2(Fe, Co)14B and Nd2(Fe, Co)17 alloy have been investigated. The decrease in B content in monophase Nd2(Fe, Co)14B alloy induced the formation of Nd2(Fe,Co)17 phase. The remanence Br, of dual alloy Nd12.5 Fe81.5-xCo6Bx with x= 5.2 is higher than that of monophase Nd12.5Fe81.5-xCo6Bx with x=5.88. This may be due to an exchange-coupling interaction between Nd2(Fe, Co)14B and Nd2(Fe, Co)17 phase. Correspondent:( XIAO Yaofu, associate professor, Department of Materials Science, University of Science and Technology Beijing, Beijing 100083)