Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By V. L. O. de Brito, A. C. da Cunha Migliano, L. V. Lemos, and F. C. L. Melo

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Pulsed-current sensors require transducers constituted of magnetic materials with high magnetic permeability in a frequency range compatible with the period and the frequency of the current pulse. The use of ferrites in this application has the advantage of low cost and low losses in high frequencies. The aim of this work is to present a procedure for selection of the ceramic processing route of Ni-Zn ferrite for application in a pulsed-current sensor. The ferrite samples were prepared under different processing parameters and characterized in terms of microstructure, chemical analysis, complex magnetic permeability, and magnetic hysteresis. The chosen processing route included high energy milling of the pre-sintered powder, its disaggregation before sample forming, and sintering of the samples in air for 2h at 1300οC. Tests were performed and it was verified that using this processing route for the fabrication of the sensor's core it was possible to monitor pulses of 0.1-1.0 μs.

V. L. O. de Brito, A. C. da Cunha Migliano, L. V. Lemos, and F. C. L. Melo, "Ceramic processing route and characterization of a ni-zn ferrite for application in a pulsed-current monitor," Progress In Electromagnetics Research, Vol. 91, 303-318, 2009.

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