Paper Titles
Mössbauer Spectrometry Study of Spinodal Decomposition in Fe-25Cr-12Co-1Si Alloy during Step Ageing
p.2139
Study on Manufacture of 2:17 Sm-Co Magnets by Powder Injection Molding
p.2143
Effect of Mini Ga Doping in Nanocrystalline Nd4.5(Fe,Co)77.5B18 Magnet on Coercivity
p.2147
Electrochemical Impedance Spectroscopy of Nd-Fe-B Magnet Prepared by Spark Plasma Sintering
p.2151
New YDy-Based R2(Fe,Co)14B Melt-Spun Magnets (R=Y+Dy+Nd)
p.2155
Spark Plasma Sintering Nd2Fe14B/α-Fe Bulk Exchange-Spring Magnets
p.2161
Study on Two-Phase Nanocrystalline Nd2Fe14B/α-Fe Bonded Magnet
p.2165
Influence of Cooling Rate on Microstructure of NdFeB Strip Casting Flakes
p.2169
Exchange-Coupling Interaction and Effective Anisotropy in Two-Phase Nanocomposite Permanent Magnetic Materials
p.2173

New YDy-Based R2(Fe,Co)14B Melt-Spun Magnets (R=Y+Dy+Nd)

Article Preview

Abstract:

The effects of the ratio of Y to Dy as well as the effect of Nd and Co substitutions on magnetic properties in [Ndx(YDy)0.5(1-x)]2.2Fe14-yCoyB ribbons melt-spun at 22 m/s have been systematically studied. (Y1-zDyz)2.2Fe14B ribbons with a ratio z of 0.25 or 0.5 simultaneously obtains a smaller temperature coefficient of remanence (α ) and coervicity (β ) which are much smaller than those of Nd-based Nd2Fe14B ribbons. In [Ndx(YDy)0.5(1-x)]2.2Fe14-yCoyB ribbons, Nd substitution (x=0 to 0.8) can improve the maximum energy product (BH)max of annealed ribbons but degrades the temperature stability of the magnetic properties. The ribbons with x=0.4 and y=0 yield a (BH)max of 8.7 MGOe. For these ribbons, the α and β are -0.07 and -0.31 %/°C in the temperature range of 27 to 127°C, respectively. Increasing Co (x) from 0 to 3, slightly decreases coercivity Hcj from 21.5 to 16.3 kOe, but keeps the (BH)max in the range of 8.6 to 10.2 MGOe. The optimal sample with x=0.5 and y=1.5 obtains a (BH)max of 10.2 and 5.0 MGOe at 27 and 250°C, respectively. Its α and β are -0.11 and -0.30 %/°C, respectively. These results show that studied ribbons are very promising to develop into high temperature isotropic bonded magnets capable of operating at or above 180°C.

You might also be interested in these eBooks
PRICM-5 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

2155-2160

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.2155

Citation:

Cite this paper

Online since:

January 2005

Authors:

W. Tang, K.W. Dennis, Matthew J. Kramer, I.E. Anderson, R.W. McCallum

Keywords:

Magnetocrystalline Anisotropy, Melting Spinning, Permanent Magnet, R2Fe14B Phase, Rare Earth Compounds, Rare Earth Materials

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[2] R. Grössinger, R. Krewenka, X. K. Sun, R. Eibler, H. R. Kirchmayr, and K. H. J. Buschow: J. Less-Common Met. Vol. 124(1986), p.165.

DOI: 10.1016/0022-5088(86)90488-1

Google Scholar

[3] S. Hirosawa, Y. Matsuura, H. Yamamoto, S. Fujimura, M. Sagawa, and H. Yamauchi: J. Appl. Phys. Vol. 59(1986), p.873.

Google Scholar

[4] E. B. Boltich, E. Oswald, MQ. Huang, S. Hirosawa, W. E. Wallace, and E. Burzo: J. Appl. Phys. Vol. 57(1985), p.4106.

Google Scholar

[5] D. Givord, H. S. Li, and J. M. Moreau: Solid State Commun. Vol. 50(1984), p.497.

Google Scholar

[6] M. Bogé, J. M. D. Coey, G. Czjzek, D Givord, C. Jeandey, H. S. Li, and J. L. Oddou: Solid State Commun. Vol. 55(1985), p.295.

DOI: 10.1016/0038-1098(85)90611-8

Google Scholar

[7] W. Tang, K. W. Dennis, Y. Q. Wu, M. J. Kramer, I. E. Anderson and R. W. McCallum: IEEE Trans. Magn. July 2004 (in press).

Google Scholar

[8] C. D Fuerst, J. F. Herbst, and E. A. Alson: J. Magn. Magn. Mater. Vol. 54-57(1986), p.567.

Google Scholar