Improvement of coercivity and microstructure of Nd_<14.73>Fe_<78.67>B_<6.60> melt-spun ribbons by addition of Zn

概要

論文の詳細を見る
The microstructures and magnetic properties for melt-spun ribbon of typical composition (Nd_<14.73>Fe_<78.67>B_<6.60>)_<100-x>Zn_x (x=0,1,2 and 3) have been studied. We have found that the coercivity was greatly enhanced and microstructure was sensitively influenced by addition of Zn. For Nd_<14.73>Fe_<78.67>B_<6.60> magnets with 1at% Zn addition, the coercivity at room temperature was enhanced from 16 kOe to 20.2kOe. The highest magnetic properties such as remanence (B_r), coercivity (_iH_c), and maximum energy product [(BH)_<max>] were 7.54 kG, 21 kOe, 12 MGOe, respectively. TEM and EDAX studies revealed that Nd-rich phases were well distiributed along the grain boundaries and Zn concentration is increased around grain boundaries. In addition, XRD showed the formation of NdZn_2 phase. The improvement of a coercivity by the Zn addition is believed to be due to good distribution of Nd-rich phase and the appearance of NdZn_2.
社団法人日本磁気学会の論文
1999-01-20