Abstract
Silicon carbide (SiC) nanoparticles can be used for ceramics reinforcement, creation of nanostructured ceramics, microelectromechanical systems. The paper presents the results of plasmadynamic synthesis of silicon carbide nanopowders. This method was realized by the synthesis in an electrodischarge plasma jet generated by a high-current pulsed coaxial magnetoplasma accelerator. Powdered carbon and silicon were used as precursors for the reaction. Four experiments with different energy levels (from 10.0 to 30.0 kJ) were carried out. The synthesized products were analysed by several modern techniques including X-ray diffractometry, scanning and transmission electron microscopy. According to analysis results all the products mainly composed of cubic silicon carbide (b-SiC) with a small amount of unreacted precursors. Silicon carbide particles have a clear crystal structure, a triangular shape and sizes to a few hundred nanometers. Comparison of the results of experiments with different energy levels made it possible to draw conclusions on ways to control product phase composition and dispersion. The silicon carbide content and particles sizes increase with increasing the energy level.
Highlights
Silicon carbide is the only stable compound in the Si-C system known about hundred years
According to computer calculations by PowderCell 2.4 software the powder product of plasmodynamic synthesis in all cases consists of four crystalline phases with the following crystallographic parameters of structural models: cubic silicon carbide β-Silicon carbide (SiC), space group SPGR – F43m {216}; cubic silicon cSi, SPGR – F-43/d-32/m {227}; graphite gC, SPGR – P6-3mc {186}; carbon onions structure C-Onions, SPGR – P6-3mc {186}
Silicon carbide (SiC) nanopowders were produced by plasmadynamic synthesis
Summary
Silicon carbide is the only stable compound in the Si-C system known about hundred years. Plasmodynamic method of the nanopowders synthesis is based on the chemical reaction of silicon and carbon in a hypersonic electrodischarge plasma jet. Plasmodynamic method was reported to be used for obtaining nanopowders of materials based on tungsten, silicon and carbon [20], [21], [22].The possibility of silicon carbide synthesis has been shown [22].The present article is devoted to the study of the influence of the energy level on the product characteristics.
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