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Preparation and Characterization of Core-Shell Composite Based on Fe Powder and Phenol-Formaldehyde Resin Modified with Nanometer-Sized Sio2

  • : Strečková, M1
  • : 1SAS
  • : PDF Download
  • : 2012

Abstract

Fabrication of composite Fe(core)/PFR-SiO2(shell) based on Fe powder particles and phenol-formaldehyde resin (PFR) modified with nanometer-sized SiO2 is investigated in detail. The chemical synthesis of PFR, its modification with nano-SiO2 and subsequent coating process enables a rather precise control of electrically insulating PFR-SiO2 layer on the surface of Fe powder particles. The thermogravimetric analysis of both PFR-SiO2 coating as well as Fe/PFR-SiO2 composite was performed. A correlation between mechanical hardness and flexural strength of Fe/PFR-SiO2 composite was studied in dependence on the amount of nano-SiO2 in the coating. The SEM of prepared Fe/PFR-SiO2 composite exhibits a defectless microstructure without pores and cracks. The morphology of coated Fe powder particles implies a very uniform coating without any visible exfoliation. The very fine SiO2 powder particles of nanometer size were verified by TEM. The fabricated core-shell Fe/PFR-SiO2 compo site represents a novel example of interesting insulating soft magnetic material.
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