Abstract
A skin layer which was generated near the surface of hot-pressed silicon nitride ceramics was studied from microscopic viewpoint. The ceramics was composed of acicular β-Si3N4 grains and glassy grain boundary which was liquid at hot-pressing temperature. The thickness of skin layer increased with an increase in the amount of sintering additive up to 8wt%. The amount and viscosity of the liquid phase and the applied pressure in the hot-pressing influenced strongly the microstructure development of the silicon nitride ceramics. These factors affected the α→β phase transformation and the formation of acicular β-Si3N4 grains. A compositional difference of glassy phases was observed between the skin layer and the bulk of Si3N4 ceramics. A mechanism of the generation of skin layer was discussed on the basis of experimental results.
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