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Characterization of composite materials based on Fe powder (core) and phenol–formaldehyde resin (shell) modified with nanometer-sized SiO2

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Abstract

Soft magnetic composites based on Fe powder and phenol–formaldehyde resin (PFR) modified with tetraethylorthosilicate are investigated in detail. The chemical synthesis of PFR, its modification with nanometer-sized SiO2 particles created by sol–gel method and subsequent coating, enables a preparation of insulating PFR–SiO2 (PFRT) layer on the surface of Fe particles. Thermal degradation and FTIR analysis of PFR and PFRT with different amount of SiO2 was examined. Mechanical hardness and flexural strength of FePFRT composites was studied depending on the amount of nanosized-SiO2 in the coating. SEM serves in evidence of a defectless microstructure if the coating contains at least 2% of silica particles. The morphology of Fe particles implies uniform coating without any visible exfoliation. A presence of fine SiO2 particles was verified by TEM. The best magnetic properties were found in Fe–PFRT composite with 2% of SiO2 in the insulating layer on behalf of its uniform arrangement and homogeneity.

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Acknowledgements

This work was financially supported by Slovak Research and Development Agency under the contract no. APVV 0222/10. It was also supported in part by the projects “The progressive technology for preparation of microcomposite materials for electrotechnology”, ITMS 26220220105 and “Centre of excellence of advanced materials with nanoand submicron-structure”, ITMS 2622012001 which are supported by the Operational Program “Research and Development” financed through European Regional Development Fund and by the Scientific Grant Agency of the Ministry of Education of Slovak Republic and the Slovak Academy of Sciences, project nos VEGA 1/0861/12, 1/0862/12 and 2/0155/12.

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Authors and Affiliations

  1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01, Košice, Slovak Republic

    M STREČKOVÁ, L’ MEDVECKÝ, R BUREŠ & M FÁBEROVÁ

  2. Institute of Physics, Faculty of Science P. J. Šafárik University, Park Angelinum 9, 040 01, Košice, Slovak Republic

    J FÜZER, P KOLLÁR & V GIRMAN

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  1. M STREČKOVÁ
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  2. J FÜZER
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STREČKOVÁ, M., FÜZER, J., MEDVECKÝ, L. et al. Characterization of composite materials based on Fe powder (core) and phenol–formaldehyde resin (shell) modified with nanometer-sized SiO2 . Bull Mater Sci 37, 167–177 (2014). https://doi.org/10.1007/s12034-014-0644-7

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  • DOI: https://doi.org/10.1007/s12034-014-0644-7

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