Abstract
The HfB2-HfC-SiC nanocomposite was produced using H3BO3, HfO2, Si, C, and Mg as starting materials by spark plasma for the first time. The reactions during synthesis indicate that the synthesis process progressed in self-propagating mode. The reaction mechanisms were investigated by the displacement-temperature-time (DTT) diagram, which was obtained during spark plasma cycles. The synthesis process of the composite was completed at the temperature of 400 °C in less than 30 min. The tendency to form the composite was investigated by thermodynamic calculations, and the formation of HfB2, HfC, and SiC phases was observed by X-ray diffraction. Finally, using the Rietveld method, the mean crystallites sizes of about 54, 26, and 43 nm were calculated for HfB2, SiC, and HfC phases, respectively.
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