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Mechanical and magnetic properties of spark plasma sintered soft magnetic FeCo alloy reinforced by carbon nanotubes

Published online by Cambridge University Press:  20 October 2016

Amar J. Albaaji ,
Elinor G. Castle ,
Mike J. Reece ,
Jeremy P. Hall  and
Sam L. Evans
Amar J. Albaaji*
Affiliation:
Wolfson Centre for Magnetics, Cardiff School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
Elinor G. Castle
Affiliation:
School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK; and Nanoforce Technology Ltd., Queen Mary University of London, London E1 4NS, UK
Mike J. Reece
Affiliation:
School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK; and Nanoforce Technology Ltd., Queen Mary University of London, London E1 4NS, UK
Jeremy P. Hall
Affiliation:
Wolfson Centre for Magnetics, Cardiff School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
Sam L. Evans
Affiliation:
Institute of Mechanical and Manufacturing Engineering, Cardiff School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Different volume fractions (0.5–4.5 vol%) of carbon nanotubes (CNTs) were used to reinforce a binary Fe50Co soft magnetic alloy. The first method for dispersion involved dry mixing and ball milling of the powder, while the second included wet mixing in dimethylformamide under ultrasonic agitation, drying and then dry ball milling. The powders were consolidated using spark plasma sintering. Tensile test and SEM analyses were performed to characterize the mechanical properties and the fracture surface of the sintered materials. The best magnetic and mechanical properties were achieved using the first method. A maximum enhancement in tensile strength of around 20% was observed in the 0.5 vol% CNT composite with improved elongation compared to the monolithic Fe50Co alloy. In addition, the magnetic properties were enhanced by adding CNTs up to 1 vol%, and an improvement in densification was observed in composites up to 1.5 vol% CNT with respect to monolithic Fe50Co alloy.

Keywords

carbon nanotubesspark plasma sinteringsoft magnetic
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 21 , 14 November 2016 , pp. 3448 - 3458
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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