关键字：Terbium compounds;Coercive force - Deposition - Electrophoresis - Grain boundaries - Iron alloys - Magnets - Neodymium - Neodymium alloys - Sintering - Temperature - Thermodynamic stability;Annealed samples - Electrophoretic depositions - Grain boundary phase - Matrix grains - Operating temperature - Sintered NdFeB magnet - Temperature coefficient - Temperature intervals
摘要：Using electrophoretic deposition (EPD) method, the impact of TbF<inf>3</inf>diffusion on the coercivity, microstructure and thermal stability of sintered Nd-Fe-B magnets with different rare earth (RE) content was investigated. In the diffused magnets with the RE content of 34 wt.%, the maximum coercivity about 28.12 kOe with less than 1.44 wt.% Tb was achieved, the coercivity temperature coefficient (β) was improved to -0.50 %/°C from -0.58 %/°C within the temperature interval 25-160 °C, and the maximum operating temperature further increased to about 160 °C. It suggested that TbF<inf>3</inf>diffused magnets had much superior thermal stability than the annealed samples. This was attributed to the formation of the Tb-rich (Nd, Tb)<inf>2</inf>Fe<inf>14</inf>B phase in the outer region of the matrix grains and the improved Nd-rich grain boundary phase after TbF<inf>3</inf>diffusion.<br/> © 2018 Author(s).
卷号：8
期号：5
是否译文：否