Preparation and Characterization of Fe/SiO_{2} Powder Composites Using Impregnation Method

• Authors: M. Kabátová , J. Füzer , J. Füzerová , E. Dudrová , P. Kollár
• Languages of publication: EN

Abstracts

EN

Fe/SiO_{2} powder composite materials based on irregularly and/or spherically shaped iron powder particles with an addition of SiO_{2} nanopowder were prepared in two ways, (i) by mixing the Fe/SiO_{2} powder with 1.0 wt.% of Shellac dissolved in ethanol and (ii) by vacuum/pressure impregnation of low-temperature sintered Fe/SiO_{2} components with shellac dissolved in ethanol and with thermoplast SL450. SiO_{2} was implemented either as nanopowder or by sol-gel coating. Vacuum/pressure impregnation (VPI) of pre-sintered samples was performed in a steel container. The influence of iron particle shape and processing conditions on the electro-insulating layer was microscopically evaluated and correlated with the values of the electrical resistivity and coercivity. It has been found that the continuity, distribution and thickness of insulating phase is strongly controlled by the shape of iron particles. Using the VPI procedure, the irregular surface of iron particles may cause discontinuities of insulating layer, while the spherical iron particles are well covered with continuous evenly distributed insulating layer.

Keywords

EN

81.20.Ev; 77.84.Lf; 75.60.Ej

Discipline

• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
• 75.60.Ej: Magnetization curves, hysteresis, Barkhausen and related effects(for hysteresis in ferroelectricity, see 77.80.Dj)
• 77.84.Lf: Composite materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 134-135

Dates

published

2014-07

Contributors

author

M. Kabátová

• Institute of Materials Research SAS, Watsonova 47, 040 01 Košice, Slovakia

author

J. Füzer

• Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

J. Füzerová

• Technical University Košice, Letná 9, 040 01 Košice, Slovakia

author

E. Dudrová

• Institute of Materials Research SAS, Watsonova 47, 040 01 Košice, Slovakia

author

P. Kollár

• Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.126.134