학술논문
Characterization of composite materials based on Fe powder (core) and phenol-formaldehyde resin (shell) modified with nanometer-sized SiO.
Document Type
Article
Author
Source
Subject
*IRON powder
*PHENOLS
*FORMALDEHYDE
*NANOSTRUCTURED materials
*SILICON nanowires
*SILICON oxide
*MECHANICAL properties of metals
*FOURIER transform infrared spectrophotometers
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Language
ISSN
0250-4707
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 SiO particles created by sol-gel method and subsequent coating, enables a preparation of insulating PFR-SiO (PFRT) layer on the surface of Fe particles. Thermal degradation and FTIR analysis of PFR and PFRT with different amount of SiO was examined. Mechanical hardness and flexural strength of FePFRT composites was studied depending on the amount of nanosized-SiO 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 SiO particles was verified by TEM. The best magnetic properties were found in Fe-PFRT composite with 2% of SiO in the insulating layer on behalf of its uniform arrangement and homogeneity. [ABSTRACT FROM AUTHOR]