Title :
Effect of Ce on the Magnetic Properties and Microstructure of Sintered Didymium-Fe-B Magnets
Author :
Changjiang Yan ; Shuai Guo ; Renjie Chen ; Dong Lee ; Aru Yan
Author_Institution :
Key Lab. of Magn. Mater. & Devices, Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China
Abstract :
In this paper, the influence of the substitution of didymium (Pr-Nd alloy, abbreviated to Di) with Ce on the microstructure and magnetic properties of sintered permanent magnet was investigated. A series of (Di1-x Cex)27.5Dy3Al0.1Cu0.1Febal.B1 (x = 0-0.56) magnets were fabricated by powder metallurgy route. The results indicated that essential magnetic properties, such as remanence and energy product, deteriorated by substituting Di with Ce. In general, the coercivity decreased with the increase of the content of Ce, whereas there was a sudden increase of coercivity when x = 0.24. Microstructural observations and phase analyses illustrated that grain boundary layers were thickened in magnets with x ≥ 0.24, which was attributed to the formation of CeFe2 phase.
Keywords :
aluminium alloys; boron alloys; cerium alloys; coercive force; copper alloys; dysprosium alloys; grain boundaries; iron alloys; neodymium alloys; permanent magnets; powder metallurgy; praseodymium alloys; remanence; sintering; [(PrNd)1-xCex]27.5Dy3Al0.1Cu0.1FeB; coercivity; didymium substitution; energy product; grain boundary; magnetic properties; microstructure; phase analyses; powder metallurgy; remanence; sintered permanent magnet; Coercive force; Grain boundaries; Magnetic resonance imaging; Magnetic tunneling; Perpendicular magnetic anisotropy; Saturation magnetization; Didymium-Fe-B; magnetic properties; microstructure; powder metallurgy;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2322823
