Synergy Effects in Electromagnetic Properties of Phosphate Ceramics with Silicon Carbide Whiskers and Carbon Nanotubes

Artyom Plyushch,Jan Macutkevič,Aliaksei Sokal,Algirdas Selskis,Jūras Banys,Konstantin Lapko,Polina Kuzhir

doi:10.3390/app9204388

Abstract

Hybrid composite materials based on an aluminium phosphate matrix with silicon carbide whiskers and multi-walled carbon nanotubes were studied in a wide frequency range (20 Hz to 36 GHz). It was demonstrated, that the addition of the silicon carbide whiskers enhances the dielectric permittivity and conductivity. This was explained by the difference in tunnelling parameters. Hybrid ceramics with nanotubes and whiskers also exhibits substantially improved electromagnetic shielding properties. The hybrid ceramics with 10 wt. % silicon carbide whiskers and a 1 mm thick 1.5 wt. % carbon nanotube layer, show higher than 50% absorption of electromagnetic radiation.

Highlights

Composite materials are widely used in several engineering applications, including biomedical [1], aerospace [2], and specific electromagnetic [3,4]
The aim of this paper is to investigate the electromagnetic properties of aluminium phosphate-based ceramics with carbon nanotubes (CNT)
Hybrid composite materials based on an aluminium phosphate matrix with SiC whiskers and multi-walled carbon nanotubes were studied in a wide frequency range (20 Hz to 36 GHz)

Summary

Introduction

Composite materials are widely used in several engineering applications, including biomedical [1], aerospace [2], and specific electromagnetic [3,4]. For the researchers composites are especially interesting because their features drastically depend on the preparation technique and the initial compounds’ properties [5,6,7]. Composites filled with more than one type of inclusions, or hybrid composites, have received a good deal of attention in recent decades [13,14,15]. This is because, on the one hand, the combination of fillers provides the multifunctional materials with advanced properties in comparison with one-type filled conterpartners [16,17]. Composites filled with a combination of carbonaceous and inorganic inclusions have been given less recognition [25,26]

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