刘健,李伟,王启祥,许可,周庆,钟喜春,刘仲武

• 1:华南理工大学材料科学与工程学院

摘要(Abstract)：

用Nd70Cu30共晶合金对N38商用磁体进行无压力和有压力晶界扩散。结果表明,经过普通的无压力晶界扩散后,磁体的矫顽力比相同热处理条件下未扩散磁体的矫顽力提高14.4%,而施加压力进行扩散则提高30.9%。微观组织及成分分析显示扩散处理后的磁体中的断续或连续的富钕晶界相增多,而压力扩散样品效果更明显。施加压力后,液态的富钕晶界相以微裂纹为扩散通道,使扩散介质更加均匀地分布于磁体当中,对晶界的改善更为明显,因此可以更有效地提高钕铁硼磁体的矫顽力。

关键词(KeyWords)： 晶界扩散;压力;NdCu合金;晶界相;矫顽力

Abstract:

Keywords:

基金项目(Foundation): 广东省科技计划项目(2015B010105008);; 广州市科技计划项目(201605120111410);; 华南理工大学中央高校基本业务费(2015ZP030)

作者(Author): 刘健,李伟,王启祥,许可,周庆,钟喜春,刘仲武

DOI: 10.13289/j.issn.1009-6264.2016-X306

参考文献(References)：

• [1]Hirota K,Nakamura H,Minowa T,et al.Coercivity enhancement by the grain boundary diffusion process to Nd-Fe-B sintered magnets[J].Magnetics,IEEE Transactions on Magnetics,2006,42(10):2909-2911.
• [2]Mo W,Zhang L,Liu Q,et al.dependence of the crystal structure of the Nd-rich phase on oxygen content in an Nd-Fe-B sintered magnet[J].Scripta Materialia,2008,59(2):179-182.
• [3]Nakamura H,Hirota K,Ohashi T,et al.Coercivity distributions in Nd-Fe-B sintered magnets produced by the grain boundary diffusion process[J].Journal of Physics D:Applied Physics,2011,44(6):064003.
• [4]Sepehri-Amin H,Ohkubo T,Nishiuchi T,et al.Coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed NdFe-B powders by the diffusion of Nd-Cu eutectic alloys[J].Scripta Materialia,2010,63(11):1124-1127.
• [5]Fukagawa T,Hirosawa S,Ohkubo T,et al.The effect of oxygen on the surface coercivity of Nd-coated Nd-Fe-B sintered magnets[J].Journal of Applied Physics,2009,105(7):2083.
• [6]Matsuura M,Goto R,Tezuka N,et al.Transmission electron microscopy study on Nd-rich phase at the surface of phase in Nd-Fe-B films[J].Magnetics,IEEE Transactions on,2011,47(10):3273-3275.
• [7]Fukagawa T,Hirosawa S.Coercivity generation of surface Nd2Fe14B grains and mechanism of fcc-phase formation at the Nd/Nd2Fe14B interface in Nd-sputtered Nd-Fe-B sintered magnets[J].Journal of Applied Physics,2008,104(1):13911-13911.
• [8]Li W,Ohkubo T,Akiya T,et al.The role of Cu addition in the coercivity enhancement of sintered Nd-Fe-B permanent magnets[J].Journal of Materials Research,2009,24(2):413-420.
• [9]Matsuura M,Sugimoto S,Fukada T,et al.Effect of Cu addition on coercivity and interfacial state of Nd-Fe-B/Nd-rich thin films[J].Journal of Physics:Conference Series,2010,200(8):082019.
• [10]Kim T H,Lee S R,Lee M W,et al.Dependence of magnetic,phase-transformation and microstructural characteristics on the Cu content of Nd-Fe-B sintered magnet[J].Acta Materialia,2014,66:12-21.
• [11]Akiya T,Sasaki T,Ohkubo T,et al.The origin of the coercivity reduction of Nd-Fe-B sintered magnet annealed below an optimal temperature[J].Journal of Magnetism and Magnetic Materials,2013,342:4-10.

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