| 摘要 |
Si3N4 based ceramics are prepared by molding, calcining and sintering a powder mixture of columnar-shaped Si3N4 particles having a particular size, a minor quantity of sintering aids and equiaxed Si3N4 particles. The ceramics have a structure containing a specific quantity of coarse columnar grains grown from the coarse columnar-shaped particles as seed crystals, and superior in wear resistance, resistance to chipping and thermal resistance, and useful as wear resistant components or cutting tools. The ceramics can be produced without recourse to hot press sintering by normal sintering or sintering under a gas pressure, or further by applying HIP.
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