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Electromagnetic Properties in Nanostructured Alloy Cu₇₀Co₃₀ Obtained by a Non-Equilibrium Method

100%
Laslouni W., Azzaz M.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 1
112-114
EN
The Cu₇₀Co₃₀ alloy was developed by a non-equilibrium method of "mechanical alloying", from a mixture of copper powder and pure cobalt. The nanostructured alloy Cu-Co with grains with a size of about 12 nm, has different electromagnetic properties which are often superior to those of conventional solid alloy, because of the critical size effect. In this work we are interested in the electromagnetic properties of the synthesized material. Resistivity, eddy current and the magnetization evolution were studied. The frequencies selected for plotting the diagram vary from 100 Hz to 100 kHz. To satisfy the Weiss condition, the excitation field must be of the same order of magnitude as the field that characterizes the area of Weiss. For all prepared series, the evolution of the magnetization as a function of milling time was analyzed. The influence of milling time on the resistivity variation is shown.
2
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Shielding Effectiveness of Ceramic Bodies Produced with Natural Zeolite

51%
Kanberoğlu B., Şükran Demirkıran A.
Acta Physica Polonica A
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2014
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vol. 125
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issue 2
642-644
EN
In this study, electromagnetic shielding effectiveness of ceramic bodies produced with natural zeolite illuminated by an electromagnetic pulse is investigated. A matrix model is used to calculate the propagation of electromagnetic pulse through sample. Shielding effectiveness of sample is determined for both transmitted electric and magnetic fields. Mathematical theory of the interaction and the shielding effectiveness of the sample is determined as a function of frequency, thickness of the material and the incidence angle of electromagnetic pulse. Zeolites used in this study were supplied from ETI Holding Company located in Turkey. Water was added as a binder and disc samples were shaped by uniaxial dry pressing at pressing pressure of 1.5 tone. Samples were fired in an electric furnace with a heating rate of 10°C/min at 1150C with a period of 60 min. Electrical measurements are performed to determine the dielectric constant and dielectric loss tangent at 25C constant temperature between frequency range from 1 kHz up to 2 MHz.
3
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Simulation Models of the Electromagnetic Forming Process

38%
Bartels G., Schaetzing W., Scheibe H., Leone M.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1128-1129
EN
Suitable simulation approaches for the preliminary investigation of the electromagnetic metal forming process are presented. For this purpose an uncoupled (loose-coupled) simulation model is compared to a more rigorous sequential-coupled approach. As shown by examples, the connection between electromagnetic field and spatiotemporal evolution of the deformation of the workpiece cannot always be neglected to describe the electromagnetic forming process with adequate accuracy.
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