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Updated: Jul 1, 2025

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Published on: August 25, 2016
The Electrical Conductivity, EMI Absorption Shielding Performance, Curing Process, and Mechanical Properties of
Ján Kruželák1, Andrea Kvasničáková1, Michaela Džuganová1
1Department of Plastics, Rubber and Fibres, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia.
Composites with nickel-zinc ferrite and manganese-zinc ferrite fillers show promising electromagnetic interference (EMI) shielding. Higher nickel-zinc ferrite content enhances absorption shielding effectiveness within the 1 MHz to 6 GHz range.
Area of Science:
- Materials Science
- Electrical Engineering
- Polymer Science
Background:
- Electromagnetic interference (EMI) shielding is crucial for electronic device performance and longevity.
- Developing effective and tunable EMI shielding materials remains an active research area.
- Rubber composites offer a versatile platform for incorporating functional fillers.
Purpose of the Study:
- To investigate the electromagnetic interference (EMI) absorption shielding effectiveness of rubber composites.
- To understand the correlation between electrical conductivity, permittivity, and EMI shielding performance.
- To evaluate the impact of ferrite and carbon-based fillers on composite properties.
Main Methods:
- Incorporation of nickel-zinc ferrite, manganese-zinc ferrite, and their combinations into acrylonitrile-butadiene rubber.
- Addition of carbon black or carbon fibers to ferrite-filled rubber composites.
- Evaluation of EMI absorption shielding effectiveness from 1 MHz to 6 GHz.
- Analysis of correlations between electromagnetic parameters and shielding effectiveness.
Main Results:
- Composites filled with ferrites showed high absorption shielding, but absorption maxima exceeded 6 GHz.
- Carbon-based fillers increased electrical conductivity and permittivity, reducing absorption shielding performance.
- Composites containing both ferrites and carbon-based fillers absorbed electromagnetic radiation within the target frequency range.
- Higher nickel-zinc ferrite content in combined magnetic fillers improved absorption shielding efficiency.
- Carbon-based fillers enhanced the tensile properties of the composites.
Conclusions:
- A good correlation exists among permittivity, conductivity, and EMI absorption effectiveness in these composites.
- The combination of ferrite and carbon-based fillers offers a tunable approach for EMI shielding materials.
- Nickel-zinc ferrite content is a key factor in optimizing EMI absorption shielding effectiveness.
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