還元窒化法によるサイアロン粉末の合成(1) : Z=0サイアロン(Si3N4)の合成

概要

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The reaction mechanism of Si2-ZAlzOzN8-z(Z=O, Si3N4) that was synthesized by carbothermal reduction and nitridation in SiO2-C system was investigated on basis of the results of weight change, CO content, XRD analysis and thermodynamic calculation. It was suggested that Si3N4 was formed by following reactions. SiO2+C→SiO(g)+CO(g), SiO(g)+C+2N2→Si3N4+CO(g)……………(at low temperature) Si02+CO(g)→SiO(g)+CO2(g), 3SiO(g)+3CO(g)+2N2→Si3N4+CO(g)…(at high temperature) SiC was formed at temperature above 1550°C. It was suggested that the formation of SiC occurred by following reactions. Si3N4+3SiO2→6SiO(g)+2N2, SiO(g)+2C→SiC+CO(g)