Formation and stability of β-Si3N4 and Si2N2O phases in composite materials during mechanochemical treatment of powder mixtures including silicon, Taunite-M and nitrogen-containing components
Scientific research and exploratory work on the creation of new technologies are continuing, the purpose of which is to increase the level of mechanical and high temperature properties of materials. A multicomponent carbon composite material (MCСM) containing silicon nitride and oxynitride was synthesized by the method of sequential stepwise high-energy mechanochemical treatment (MCТ) and isothermal annealing at 1100 °C of powder mixtures of Taunite-M, silicon, g-C3N4 phase and melamine. Using X-ray diffraction analysis, IR spectroscopy and Raman spectroscopy, it was proved that β-Si3N4 and Si2N2O phases are present in the MCСM. Their crystallographic characteristics and crystal lattice parameters were determined. A crystal chemical explanation of the formation and stability of these phases in the realized synthesis is proposed. The synthesized МССМ is a promising material for high-temperature heat-resistant ceramics.