Preparation, chemical and mechanical properties of microcomposite materials based on Fe powder and phenol-formaldehyde resin

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机构：

[1] Strečková, M.

[2] Sopčák, T.

[3] Medvecký, Ľ.

[4] Bureš, R.

[5] Fáberová, M.

[6] Batko, I.

[7] Briančin, J.

来源：

Strečková, M. (mstreckova@imr.saske.sk) | 1600年 / Elsevier B.V., Netherlands卷 / 180期

关键词：

Preparation of microcomposite materials based on Fe powder and the modified phenol-formaldehyde resin (PFR) was investigated with the aim to design a new class of prospective soft magnetic materials. Undesirable evolution of water and other volatile by-products during curing process was eliminated by modification of resol prepolymer coating with two different inorganic additives - SiO2 and ZnSO4. The structure of synthesized PFR was confirmed by 13C-NMR spectroscopy. The effect of both additives on thermal degradation; structure and morphology was studied by employing TG; DSC; IR and SEM analysis. The addition of ZnSO4 into PFR caused a significant change in the polymer structure; which is constituted by nano-fibers linking Fe particles. The observed unusual structure of PFR-ZnSO4 coating on Fe particles results in a higher mechanical hardness and flexural strength compared to the Fe particles coated by the pure PFR or PFR-SiO2. It is shown that the microcomposites with a few percentages of PFR coatings exhibit a substantial increase of the specific resistivity and they still belong to soft magnetic materials with low enough coercivity. © 2011 Elsevier B.V;

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Journal article (JA)

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