Оn the issue of creating composite ceramic materials
DOI:
https://doi.org/10.33216/1998-7927-2025-290-4-57-62Keywords:
composite ceramics, two-layer tile, silicon carbide, strontium titanate, semi-dry pressing, water absorption and porosity, apparent density and flexural strengthAbstract
Due to the intensive development of modern wireless communication technologies, and the continuous increase in the number of electronic devices operating across a wide frequency range, there is a steady rise in artificial electromagnetic radiation in the surrounding environment. This leads to a gradual increase in the electromagnetic background, which creates potential risks for the uninterrupted and reliable operation of highly sensitive electronic equipment, and may also have a negative impact on the health and overall condition of biological objects, including humans. Therefore, research aimed at creating new effective materials with high electromagnetic shielding properties, which should also exhibit satisfactory operational characteristics, becomes particularly relevant. This work presents the results of an experimental study on the development of a composite ceramic tile containing electrically conductive and ferroelectric functional components. Silicon carbide was used as the electrically conductive additive at 30 wt.%, while strontium titanate, a ferroelectric additive, was introduced in amounts of 10, 20, and 30 wt.%. The experimental tile has a two-layer structure: the first layer consists of a ceramic mass with 30 wt.% silicon carbide, and the second layer is a ceramic mass with the corresponding content of strontium titanate. The samples were formed by the semi-dry pressing method and fired in a silicate furnace at temperatures of 1120–1140 °C with an isothermal holding time of 20 minutes. The study analyzed the influence of varying strontium titanate content on the physical and mechanical properties of the samples. Key operational properties such as water absorption, porosity, apparent density, and flexural strength were determined. The optimal composite ceramic composition was identified, providing a balanced combination of performance characteristics: water absorption – 6.84%, porosity – 14.90%, apparent density – 2.16 g/cm³, and flexural strength – 26.5 MPa. It was established that an increase in apparent density can serve as an indicator of enhanced overall density and potential strength of the material, despite some increase in porosity. The results of this study can be used in further development of ceramic materials with functional properties suitable for applications under electromagnetic radiation exposure.
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