Carbothermally prepared nanophase SiC/ Si3N4 composite powders and densified parts

Synthesis and characterization of SiC and SiC/Si3N4 composite nano powders from waste material

“…TEM images of SiC prepared from coarse (a) and hand-ground (b) rice husk ashes pyrolysized at 1550 • C in nitrogen atmospheres. range that nanophase SiC/a-Si 3 N 4 composite powders can be synthesized [36,39]. In the present study, due to the relatively short dwell time for composite formation (2 h) and the relatively higher temperature (1550 • C), the amount of formed SiC was higher than the amount of Si 3 N 4 as indicated from XRD (Figs.…”

“…XRD patterns of SiC prepared from hand-ground rice husk ashes pyrolysized at 1550 • C in vacuum or nitrogen atmospheres. [36][37]. The reaction is moderately endothermic (1268 kJ/mol at 1427 • C) with activation energy of E 457 ± 55 kJ/mol.…”

Synthetic Inorganic Materials

“…The fracture strength of the Si 3 N 4 /SiC nanocomposite, containing only about 1.6 % SiC, at 1370 C was increased by almost 50 %. [91] …”

Synthesis of the in-Situ Si3N4-SiC Composite Nano Powders by Carbothermal Reduction

“…Within a relatively narrow temperature window around this transition temperature, SiC grain growth is minimized and nanophase SiC crystallites are produced. It is in this temperature range that nanophase SiC/Si 3 N 4 composite powders can be synthesized [25][26]. In this study, a different route from conventional methods was tried in order to synthesise micro/nano powders.…”

“…Silicon nitride (Si 3 N 4 ) and silicon carbide (SiC) powders can be synthesized from silica SiO 2 via the carbothermal reduction process in the presence of nitrogen or argon, according to overall reactions: [25][26]. Silicon carbide is a stable specie under coexistence with carbon, above 1500…”