Effect of the Whisker Content on the Microstructure and Properties of Silicon Nitride with Aligned Whisker Seeds

概要

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Silicon nitride ceramics with different amounts of aligned reinforcing grains were prepared by incorporating 3 wt%, 5 wt% and 7 wt%β-Si3N4 whiskers. The degree of alignment of the reinforcing grains was increased as the whisker content was increased as determined by the linear sintering shrinkage anisotropy. Silicon nitride ceramics with 3 wt% and 5 wt%β-Si3N4 whiskers exhibited bi-modal grain size distributions. The number of the reinforcing grains was increased as the whisker content was increased, but volume fraction occupied by those grains was the maximum for silicon nitride with 5 wt%β-Si3N4 whiskers. The fracture toughness and the flexural strength at room temperature were increased as the whisker content was increased in part due to the increased number of the aligned reinforcing grains. However, the flexural strength at 1673 K was the highest for silicon nitride with 5 wt%β-Si3N4 whiskers in part due to the maximum volume fraction occupied the reinforcing grains.
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