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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.

Relation between Microstructure and Color Tone of Skin Layer and Bulk Area of Silicon Nitride Ceramics