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罗军明.烧结NdFeB电泳沉积Al及晶界扩散[J].稀有金属材料与工程(英文),2020,49(6):2125~2131.[Luo Junming.Electrophoretic Deposition of Al Films on Sintered NdFeB and Grain Boundary Diffusion[J].Rare Metal Materials and Engineering,2020,49(6):2125~2131.]
Electrophoretic Deposition of Al Films on Sintered NdFeB and Grain Boundary Diffusion
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Received:May 12, 2019  Revised:July 10, 2019
Key words: Electrophoretic deposition  Al film  sintered NdFeB  grain boundary diffusion
Foundation item:国家自然科学基金资助(项目号51401103),江西省重点研发计划项目(项目号20181ACE50005)
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Luo Junming  
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      In this paper, an Al film was deposited on the surface of sintered NdFeB magnets by electrophoretic deposition(EPD). It was found that different EPD voltages and times have a great influence on the deposition of Al films. It also investigated the effects of different grain boundary diffusion processes on the microstructure and magnetic properties of the magnet. The results show that the best EPD process is 90 V/30 s. At this time, the combination of the film and the magnet is well, and the thickness is even and moderate. When the grain boundary diffusion process is 500 °C / 1h, the magnet obtains the best comprehensive magnetic properties, and its coercivity, remanence and maximum magnetic energy product are 953 kA/m, 1.41 T and 342 kJ/m3, respectively, which is increased by 30.2%. 0.7% and 11.4%. Through microstructure and composition analysis, it is found that after the grain boundary is diffused, a more flat and smooth rare earth-rich phase thin layer is formed between the crystals, which helps to reduce the demagnetizing field and enhance the magnetic isolation effect, and finally leads to the improvement of coercive force.