Effect of Ga, Nb Addition on Disproportionation Kinetics of Nd-Fe-B Alloy
作者： H.W. Kwon , J.H. Yu
DOI: 10.4283/JMAG.2009.14.4.150
关键词: Physical chemistry 、 Disproportionation 、 Isothermal process 、 Activation energy 、 Kinetics 、 Alloy 、 Hydrogen 、 Diffusion 、 Reaction rate 、 Materials science
摘要: The effect of Ga and, Nb addition on the kinetics and mechanism disproportionation a Nd-Fe-B alloy were investigated by isothermal thermopiezic analysis (TPA) using Nd 12.5 Fe (81.1-(x+y)) B 6.4 x y (x=0 0.3, y=0 0.2) alloys. retarded significantly, increased activation energy reaction. alloys measured under an initial hydrogen pressure 0.02 ㎫ fitted to parabolic rate law. This suggested that during with ㎫, continuous product is formed overall reaction limited diffusion atoms (or ions).
koreascience.or.kr参考文章(12)
S. Hirosawa, M. Uehara, S. Mino, N. Ishigaki, T. Tomida, New aspects of Nd–Fe–B-based hydrogenation-disproportionation-desorption-recombination powders and anisotropic bonded magnets made from them: Microstructure and magnetic properties (invited) Journal of Applied Physics. ,vol. 81, pp. 4821- 4826 ,(1997) , 10.1063/1.365472
H. Nakamura, R. Suefuji, S. Sugimoto, M. Okada, M. Homma, Effects of HDDR treatment conditions on magnetic properties of Nd‐Fe‐B anisotropic powders Journal of Applied Physics. ,vol. 76, pp. 6828- 6830 ,(1994) , 10.1063/1.358144
H.W. Kwon, J.H. Yu, Effect of hydrogen pressure on disproportionation kinetics of Nd–Fe–B alloy Journal of Alloys and Compounds. ,vol. 487, pp. 138- 141 ,(2009) , 10.1016/J.JALLCOM.2009.07.173
S Sugimoto, N Koike, D Book, T Kagotani, M Okada, K Inomata, M Homma, An improved HDDR treatment for the production of anisotropic Nd–Fe–B ternary powders Journal of Alloys and Compounds. ,vol. 330, pp. 892- 896 ,(2002) , 10.1016/S0925-8388(01)01503-1
P.J. McGuiness, X.J. Zhang, H. Forsyth, I.R. Harris, Disproportionation in Nd16Fe76B8-type hydrides Journal of The Less Common Metals. ,vol. 162, pp. 379- 387 ,(1990) , 10.1016/0022-5088(90)90353-L
O Gutfleisch, B Gebel, N Mattern, Texture in a ternary Nd16.2Fe78.2B5.6 powder using a modified hydrogenation-disproportionation-desorption-recombination process Journal of Magnetism and Magnetic Materials. ,vol. 210, pp. 5- 9 ,(2000) , 10.1016/S0304-8853(99)00702-7
D.S. Yu, S.K. Jerng, Y.S. Kim, S.H. Chun, Magnetoresistance of Planar Ferromagnetic Junction Defined by Atomic Force Microscopy Journal of Magnetics. ,vol. 14, pp. 172- 174 ,(2009) , 10.4283/JMAG.2009.14.4.172
C. Burkhardt, M. Steinhorst, I.R. Harris, Detailed SEM studies of the HDDR behaviour of direct-reduced Nd15Fe77B8 and Nd15Fe77−xB8Gax powders Journal of Alloys and Compounds. ,vol. 237, pp. 113- 120 ,(1996) , 10.1016/0925-8388(95)02181-7
Jae-Yong Lee, Jin-Ho Kim, Jeh-Won Lee, Design and Analysis of Electromagnetic Tubular Linear Actuator for Higher Performance of Active Accelerate Pedal Journal of Magnetics. ,vol. 14, pp. 175- 180 ,(2009) , 10.4283/JMAG.2009.14.4.175
H. Nakamura, K. Kato, D. Book, S. Sugimoto, M. Okada, M. Homma, Enhancement of coercivity in high remanence HDDR Nd-Fe-B powders ieee international magnetics conference. ,vol. 35, pp. 3274- 3276 ,(1999) , 10.1109/20.800496