Si3N4－TiN－SiC复相陶瓷的燃烧合成

Si₃N₄－TiN－SiCMultiphase ceramics was produced by self-propagating high-temperature synthesis with TiSi₂and SiC. The liqu id phases produced during combustion of TiSi₂ and N₂will decrease conversi on factor of the products. The effect of the dilution and nitrogenpressure on t he conversion of the products and combustion temperature was analyzed. Thecontradictory of liquid phases, dilution and combustion temperature was reso lved byincreasing nitrogen pressure. Decrease of porosity was resulted from the volume expansionof discomposed TiSi₂,the volume expansion of Si transformed to Si₃N₄at high temperature. The nitride mechanism of TiSi₂ was studied. TiN was firstsynthesized,then Si₃N₄ was formed.

CombustionSynthesis of Si3N4