Investigation of electromagnetic properties of ceramic material based on white-burning clay from Kornilovskoye deposit with non-ferrous metal additives at varying concentrations: analysis of electromagnetic radiation absorption and reflection

The paper reports the results of an experimental investigation into the electromagnetic properties of a ceramic material obtained from white-burning clay from the Kornilovskoye deposit with the addition of non-ferrous metals (lead and copper) at varying concentrations. The relevance of the study is driven by the need to develop effective radar-absorbing materials for protection against electromagnetic radiation across a wide frequency range. The purpose of the study is to investigate the relationship between the reflection and absorption coefficients of electromagnetic waves and the metallic phase content within the ceramic matrix, as well as to identify the optimal composition of the material for radar-absorbing coatings formation. The study employs the following research methods: S-parameter analysis in the 0–18 GHz frequency range and time domain reflectometry (TDR), which allows for the estimation of the reflected signal level. It has been found that the addition of lead and copper significantly affects the electrophysical properties of the material, altering its dielectric permittivity and electrical conductivity. It has been shown that at the metal concentration of 20% an insufficient degree of electromagnetic radiation absorption is observed, whereas at 40%, the reflectivity increases due to the rise in conductivity and surface effects. The most effective radar absorption properties are achieved at the metallic phase content of approximately 30%, which corresponds to the formation of an optimal material structure that ensures a balance between dielectric and conductive losses. The obtained results indicate the promise of using the developed ceramic material as a basis for radar-absorbing coatings, shielding structures, and protective elements against electromagnetic exposure.

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