Microstructure and magnetic properties of bulk magnets Nd_(14-x)Fe_(76+x)Co_3Zr_1B_6(x=0, 0.5, 1) prepared by spark plasma sintering
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：LIU Ying MA Yilong LI Jun DU Huilong GAO Jing
Key words：spark plasma sintering; NdFeB magnet; magnetic properties; microstructure; rare earths;
Abstract: Melt-spun ribbons with nominal composition of Nd_(14-x)Fe_(76+x)Co_3Zr_1B_6(x=0,0.5,1) were consolidated into isotropic bulk magnets by spark plasma sintering method. It was found that the Nd content and sintering temperature had significant influence on the density and magnetic properties of the sintered magnets. Homogeneous microstructure and fine grain (50-100 nm) were obtained when sintering below 700 ℃,and the initial magnetization curve showed that the coercivity was controlled by the pinning mechanism. However, abnormally large grains and inhomogeneous microstructure in magnets were observed after sintering at 750 ℃, furthermore, the grains were found to be multi-domain structure and the coercivity was mainly controlled by nucleation mechanism.
LIU Ying1，MA Yilong1，LI Jun1，DU Huilong1，GAO Jing1
(1.College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China)
Abstract:Melt-spun ribbons with nominal composition of Nd_(14-x)Fe_(76+x)Co_3Zr_1B_6(x=0,0.5,1) were consolidated into isotropic bulk magnets by spark plasma sintering method. It was found that the Nd content and sintering temperature had significant influence on the density and magnetic properties of the sintered magnets. Homogeneous microstructure and fine grain (50-100 nm) were obtained when sintering below 700 ℃,and the initial magnetization curve showed that the coercivity was controlled by the pinning mechanism. However, abnormally large grains and inhomogeneous microstructure in magnets were observed after sintering at 750 ℃, furthermore, the grains were found to be multi-domain structure and the coercivity was mainly controlled by nucleation mechanism.
Key words:spark plasma sintering; NdFeB magnet; magnetic properties; microstructure; rare earths;
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