窒化ケイ素焼結体の破壊源に及ぼすか粒体特性の影響

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タイトル別名
  • Effect of Granule Properties on the Fracture Origin of Silicon Nitride Sintered Bodies.
  • チッカ ケイソ ショウケツタイ ノ ハカイ ゲン ニ オヨボス カリュウタイ トクセイ ノ エイキョウ

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The effect of granule properties on the microstructure of sintered silicon nitride bodies and their strength variation was examined. Commercially available silicon nitride, alumina and yttria powders were used as the raw materials. The granules were fabricated under three different spray drying conditions. Employed were several characterization techniques which are capable of directly observing the internal structures of granules, green bodies and of sintered bodies. The strength variation of the sintered bodies was correlated with the dimension of large pores detected by the direct observation of the internal structure of sintered bodies. These pores were originated from the inherent flaws in green compacts. These inherent flaws were introduced by non-uniform packing of powder particles via the incomplete collapse of dimples in granules and also from the cavities between granules. Furthermore, it was emphasized that these large pores in the sintered body was controlled by the granule size, dimple size, as well as the yield stress of granules.

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