期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 491, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2019.165541
关键词
Two-step diffusion; Dy/Al films; Magnetron sputtering; Thermal stability
资金
- National Natural Science Foundation of China [51564037, 51774146, 51401103]
- Plan of Jiangxi Province Key Research and Development [20181ACE50005]
- Jiangxi Provincial Education Department's Research Project [GJJ170587]
Two-step grain boundary diffusion processes (GBDP) were carried out to obtain the diffused magnets with excellent magnetic properties and high thermal stability, using Dy and Al coated films as diffused sources in turn, prepared by magnetron sputtering. It is found that through the two-step diffusion with Dy/Al films, the highest coercivity, up to 1382 kA/m is achieved, increasing by 42.3% compared to as-prepared magnet, moreover, the maximum energy product is improved significantly as well. Besides, whether for as-prepared magnets or one-step diffused magnets with Al film and Dy film, respectively, the thermal stability and magnetic properties of two-step diffused magnet with Dy/Al film, are the highest among magnets. Microstructural investigation reveals that Dy is preferred to diffuse along the RE-rich phase and forming the shell of (Nd, Pr, Dy)(2)Fe14B phase around the outer region of main phase, restraining the nucleation of anti-magnetization domain, while the Al tends to locate in the RE-rich region, playing the role of modifying the interface between RE-rich phase and 2:14:1 main phase. Eventually, the temperature coefficient of coercivity (vertical bar beta vertical bar) and remanence (vertical bar alpha vertical bar) with 0.65%/K and 0.12%/K, can be obtained, respectively.
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