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The Effect of Silanisation on Microstructural Stability and Magnetic Properties of the Intermetallic Sm2(Co, Fe, Cu, Zr)17·

Published online by Cambridge University Press:  20 January 2011

M. I. Qadeer ,
Bruska Azdhar  and
S. J. Savage
M. I. Qadeer
Affiliation:
Department of Materials Science and Engineering, The Royal Institute of Technology, SE-100 44, Stockholm, Sweden.
Bruska Azdhar
Affiliation:
Department of Fibre and Polymer Technology, The Royal Institute of Technology, SE-100 44, Stockholm, Sweden.
S. J. Savage
Affiliation:
Department of Materials Science and Engineering, The Royal Institute of Technology, SE-100 44, Stockholm, Sweden. Division of Information Systems, Swedish Defence Research Agency (FOI), SE-581 11 Linköping, Sweden.
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Abstract

The effects of silanising using the coupling agent γ-glycidoxpropyltrimethoxysilane on microstructural stability and magnetic properties of Sm-Co powder particles have been investigated. The silanisation provides structural stability by improving the oxidation resistance at 400oC for 10 hours. The untreated particles undergo microchemical changes by redistribution of alloying elements which mainly accumulate in parallel black and grey streaks in the interior of the particles. The silanised particles after heat treatment show coercivity of 836 Oe and the untreated particles show a much lower coercivity of 376 Oe. The difference in magnetic properties of uncoated particles is caused by diffusion of oxygen and microstructural instability.

Keywords

magnetic propertiesmicrostructurecoating
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n09-07
Copyright
Copyright © Materials Research Society 2011

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References

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