Dielectric properties of SiCf/SiC composites

El, Boubakraoui My Chrif; Bri, Seddik; Foshi, Jaouad

doi:10.5937/fmet1801086e

Cited by 5 publications

(1 citation statement)

References 16 publications

(32 reference statements)

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“…In the high frequency range, a TDR method is considered as a useful experimental tool for an optimal dielectric measurement. The evaluation of heterogeneous mixtures permittivity has shown difficulties in terms of modeling techniques and multitude of mixing laws encountered in the literature where being pointed out [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A High Frequency Dielectric Behavior Modeling of a ReXTMnO2 Ternary Composite as an Equivalent Binary Mixture

Brahimi¹,

Bourouba²,

Jiménez³

et al. 2021

RCMA

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The goal of this paper is to study the dielectric behavior, in the ternary composites microwave domain, and simplifying ternaries models into binaries ones using time domain spectroscopy. We worked on three ternary composites made of epoxy resin (Re), manganese dioxide (MnO2) and one of three different titanates (XT): barium titanate (BT), calcium titanate (CT) or magnesium titanate (MT). These composites samples dielectric behavior is inspected over a frequency range from DC to 5 GHz. This aims to optimize the predictive modified Lichtenecker's law model (MLL) through a better smoothing shape factor making theoretical and experimental results very close to each other. The comparison between these results shows that the MLL model is pertinent for ternary mixtures (Re-XT-MnO2) with an appreciable accuracy degree. Another numerical approach applied to the Re-[Re-XT-MnO2] mixtures using a binary mixture model equivalent to the previous ternary one based on a simplified MLL expression and preserving the same mixture constituents. This model results are in good agreement not only with ternaries ones being modeled with this law but also with other modeling laws appreciated with binary composites. This study interest lies on these materials application in the telecommunications components miniaturization and in microwave electronic applications.

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Section: Introductionmentioning

confidence: 99%

A High Frequency Dielectric Behavior Modeling of a ReXTMnO2 Ternary Composite as an Equivalent Binary Mixture

Brahimi¹,

Bourouba²,

Jiménez³

et al. 2021

RCMA

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Permittivity of SiC ceramic matrix compositesin Ku band

Ouhassan

Bri

Boubakraoui³

et al. 2021

E3S Web Conf.

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The objective of this work is to determine the dielectric permittivity of two SiC ceramic matrix composites. These composites are reinforced with NicalonSiCfibers and SCS6SiC fibers (SiCf / SiC) and have different volume fractions. The results obtained show that the dielectric property depends on the volume fraction and the frequency. Composites with high volume fractions have better dielectric properties than others. The values of the real and imaginary part of the complex permittivity decrease with frequency increase in the Ku-band. Moreover, the imaginary part takes negative values.

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