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Title: Shungite – a carbon-mineral rock material: Its sinterability and possible applications
Authors: Obradovic, Nina
Gigov M.
Ðorđević A.
Kern, Frank
Butulija, Svetlana
Matovic, Branko
Ðorđević A.
Tshantshapanyan A.
Vlahović B.
Petrovic, Predrag
Pavlović, Vladimir
Issue Date: 2019
Abstract: © 2019 University of Novi Sad, Faculty of Technology. All rights reserved. The paper presents results of the influence of mechanical activation of shungite, a carbon-mineral rock material rich in silica and carbon, on its sintering behaviour, and obtaining of pure SiC ceramics. The mechanical activation of the starting powder was performed in a high-energy ball mill in time intervals from 30 to 480 min. The phase composition of the starting powders and sintered samples was analysed by the X-ray diffraction method. The first traces of SiC were detected after sintering at 1350 °C for 2 h in an Ar atmosphere, along with traces of unreacted SiO2. The scanning electron microscopy was performed in order to determine changes in the microstructure. Sintering was performed at various temperatures for 2 h, in an Ar atmosphere and a vacuum. Dielectric properties of the sintered samples were measured in the frequency range from 1 to 500 MHz. The obtained results indicate that the sintered powder is a good candidate for applications as an absorber of electromagnetic waves in microwave engineering.
Type: article
DOI: 10.2298/PAC1901089O
ISSN: 1820-6131
SCOPUS: 2-s2.0-85070721263
Appears in Collections:Faculty of Technical Sciences, Čačak

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