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Fine and uniform silicon nitride powders having different α-content were prepared from commercial submicron powders by centrifugal sedimentation. The densified pre-sintered materials were fabricated from these powders by hot-pressing. The fine powders with similar particle size distribution showed the same densification behavior during hot-pressing. The microstructures of pre-sintered materials of the fine powders showed the fine and homogeneous microstructures, and the similar one irrespective of α content. The pre-sintered materials were annealed at 1800°C for 1h under 1MPa nitrogen atmosphere. The annealed material from the fine β powder showed the fine and homogeneous microstructure. On the other hand, the material from the fine α powder developed “in-situ composite” microstructure consisting of large grains and fine matrix grains by annealing. Because, the abnormal grain growth was caused by the α- to β-phase transformation during annealing. While, these results of the fine powders were compared with those of the commercial submicron powders.

Influence of Phase Transformation on Densification Behavior and Grain Growth of Fine Silicon Nitride Powder