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Elevated Temperature Properties of Sintered Magnets of (Nd,Dy)-Fe-B Modified with Cobalt and Aluminum

Published online by Cambridge University Press:  25 February 2011

Y. Xiao ,
H. F. Mildrum ,
K. J. Strnat  and
A. E. Ray
Y. Xiao
Affiliation:
School of Engineering, University of Dayton Dayton, Ohio 45469
H. F. Mildrum
Affiliation:
School of Engineering, University of Dayton Dayton, Ohio 45469
K. J. Strnat
Affiliation:
School of Engineering, University of Dayton Dayton, Ohio 45469
A. E. Ray
Affiliation:
School of Engineering, University of Dayton Dayton, Ohio 45469
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Abstract

The effect of small aluminum additions on the temperature dependence of remanence and intrinsic coercivity in Co- and Dy-containing Nd-Fe-B was studied. Sintered magnets were prepared and demagnetization curves measured at temperatures between −50 to +200°C. Curie temperatures and irreversible flux losses in open circuit were determined. Al increases the coercivity while decreasing remanence, energy product and Curie temperature. Other unfavorable side effects are the increase in temperature coefficients of Br and, especially, MHc. Substitution of Al is not beneficial for magnets used at elevated temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 96: Symposium F – High Performance Permanent Magnet Materials , 1987 , 155
Copyright
Copyright © Materials Research Society 1987

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References

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