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The effect of Y2O3/SiO2 ratio on grain growth of Si3N4 was systematically investigated using the “seed” fabrication method. The aspect ratio of β-Si3N4 crystals heat-treated with an additive composition of Y2O3:SiO2=1:2 was found to be much smaller than that of Y2O3:SiO2=2:1. It was confirmed that this was due to the difference in solubility of Si3N4 caused by the change of Y2O3/SiO2 ratio of the liquid phase. The number of β-crystals originally contained in the raw Si3N4 powder changed very little in the Y2O3:SiO2=1:2 composition, while it significantly decreased in the Y2O3:SiO2=2:1 composition, which resulted in a considerable difference in aspect ratio. A mechanism for this enhanced solubility of Si3N4 in the liquid phase with high Y2O3/SiO2 ratio was proposed.
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Kitayama et al. (1999) studied this question.
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