SECONDARY SILICON CARBIDE FORMED IN THE INTERACTION OF NANOSIZED SILICON CARBIDE WITH IRON OXIDE

Abstract

The peculiarities of the superfine powder composite formed in the interaction of nanosized silicon carbide with iron oxide in vacuum and argon at 1200 and 1400 °C, respectively, are analyzed. The main components of the powder composites obtained are silicon carbide (β-SiC), silicide and iron carbide, as well as silicon oxide and silicon oxynitride. The lattice parameter of SiC in the powder composites synthesized in SiC–Fe₂O₃ system is determined. In the interaction of the powder mixture in the SiC–Fe₂O₃ system in vacuum, secondary SiC is synthesized with a lattice parameter that corresponds to the standard value for cubic β-SiC. The same interaction in the argon atmosphere is accompanied by the synthesis of secondary SiC with a decreased lattice parameter. The minimum lattice parameter (0.4336 nm) is 0.6% lower than the standard cubic β-SiC value. The morphology of the powder composite synthesized in the SiC–Fe₂O₃ system is studied. The decrease in the average particle size of the powder composite occurs with growth of the weight content of secondary SiC in the powder composites.