REACTION OF A MOLTEN MIXTURE OF TITANIUM, ALUMINUM, AND SILICON-OXIDES WITH HOT-PRESSED SILICON-NITRIDE

The formation temperature of a liquid phase and the solidification tem perature of a molten mixture of Al2O3 - TiO2 - SiO2 oxides on a silico n nitride substrate are determined. Data are obtained for the change i n kinetics. It is established that the intensity of interaction of mol ten Al2O3 - TiO2 - SiO2 with silicon nitride depends on the oxide mixt ure composition. With heating there are two possibilities: improvement and worsening of Si3N4 crystallite wetting with a liquid phase as wel l as solidification of the melt. The temperature range where a liquid phase exists for actual materials is about 15-degrees-C, which markedl y worsens the process of structure formation with Si3N4 during sinteri ng.