Modification of silicon carbide ceramics by hierarchical systems “multi-walled carbon nanotubes-silicon”

Samples of porous ceramics based on silicon carbide were obtained by reactive sintering under pressure. Fine-crystalline silicon was used as a binder in combination with multi-walled carbon nanotubes (MWCNTs) with deposited silicon particles. The pressing pressure was 30 MPa, the temperature was varied in the range of 1420-1480 °C, the MWCNTs content was from 0 to 4 wt. %, and silicon binder from 20 to 25 wt. %. The structure of the obtained ceramics was studied by optical and scanning electron microscopy. The main regularities of the structure formation of sintered modified ceramics are established depending on the sintering conditions. To study the physical and mechanical properties of the obtained samples, the three-point flexural test was used. The studies were carried out using facilities of the shared research center “National center of investigation of catalysts” at Boreskov Institute of Catalysis.The authors are grateful to Ishchenko A.V. for the TEM characterization of НК samples.