Origin of radical coercivity reduction in fine Nd-Fe-B-type hydrogenation, disproportionation, desorption, recombination particles and its recovery
作者： H. W. Kwon , J. G. Lee , J. H. Yu
DOI: 10.1063/1.4866083
关键词: Desorption 、 Metallurgy 、 Chemical engineering 、 Ball mill 、 Disproportionation 、 Particle size 、 Isotropic etching 、 Sintering 、 Coercivity 、 Hydrogen 、 Materials science
摘要: Coercivity variation of fine Nd-Fe-B-type particles prepared by ball milling HDDR (hydrogenation, disproportionation, desorption, recombination)-treated material was investigated using a HDDR-treated Nd12.5Fe80.6B6.4Ga0.3Nb0.2 material, and it compared with that mechanical sintered Nd10Pr2.5Fe80.4B6Ga1Cu0.1 magnet. the from radically reduced as particle size decreased. In order to determine major cause for radical coercivity reduction, surface oxidation, structural damage (micro-strain), crystallographic change (lattice shrinkage due residual hydrogen desorption) in milled were examined. The contributory factor observed reduction oxidation. Chemical etching proved an effective means recovery material. contrast magnet, could have reasonably high even very powder.
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sci-hub.se 参考文章(9)
Y. Li, H.E. Evans, I.R. Harris, I.P. Jones, The Oxidation of NdFeB Magnets Oxidation of Metals. ,vol. 59, pp. 167- 182 ,(2003) , 10.1023/A:1023078218047
P.J. McGuiness, X.J. Zhang, X.J. Yin, I.R. Harris, Hydrogenation, disproportionation and desorption (HDD): An effective processing route for NdFeB-type magnets Journal of The Less Common Metals. ,vol. 158, pp. 359- 365 ,(1990) , 10.1016/0022-5088(90)90071-Q
AS Kim, DH Kim, S Namkung, TS Jang, DH Lee, HW Kwon, DH Hwang, None, Development of high coercive powder from the Nd-Fe-B sintered magnet scrap IEEE Transactions on Magnetics. ,vol. 40, pp. 2877- 2879 ,(2004) , 10.1109/TMAG.2004.832241
L.Y. Zhang, F. Pourarian, W.E. Wallace, Magnetic behavior of R2Fe14B hydrides (R = Gd, Tb, Dy, HoandEr) Journal of Magnetism and Magnetic Materials. ,vol. 71, pp. 203- 211 ,(1988) , 10.1016/0304-8853(88)90086-8
HW Kwon, IC Jeong, AS Kim, DH Kim, S Namkung, TS Jang, DH Lee, None, Restoration of coercivity in crushed Nd–Fe–B magnetic powder Journal of Magnetism and Magnetic Materials. ,vol. 304, ,(2006) , 10.1016/J.JMMM.2006.01.144
W.E. Wallace, F. Pourarian, A.T. Pedziwiatr, E.B. Boltich, Recent magnetic studies of complex metal hydrides Journal of the Less Common Metals. ,vol. 130, pp. 33- 46 ,(1987) , 10.1016/0022-5088(87)90084-1
H.W. Kwon, J.H. Yu, Study on Oxidation and Coercivity of Nd 2 Fe 14 B Compound Crystal Journal of The Korean Magnetics Society. ,vol. 22, pp. 85- 90 ,(2012) , 10.4283/JKMS.2012.22.3.085
Takeshi Nishiuchi, Satoshi Hirosawa, Masaki Nakamura, Masatoshi Kakimoto, Takeshi Kawabayashi, Hideki Araki, Yasuharu Shirai, Relationship between Coercivity and Microstructural Changes During DR Treatment in the HDDR-processed NdFeCoB Alloy Ieej Transactions on Electrical and Electronic Engineering. ,vol. 3, pp. 390- 393 ,(2008) , 10.1002/TEE.20289
Md. Abdul Matin, Hae-Woong Kwon, Jung-Goo Lee, Ji-Hun Yu, Tae Hoon Kim, Cheol-Woong Yang, Residual Hydrogen in Nd-Fe-B HDDR Powder and Its Effect on Coercivity of Hot-Pressed Compact IEEE Transactions on Magnetics. ,vol. 49, pp. 3398- 3401 ,(2013) , 10.1109/TMAG.2013.2243118