ZrO_2強靱化ムライトセラミックスの焼結と微構造

概要

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Mullite/ZrO_2 composite ceramics were fabricated from sol-gel derived powders. The effects of ZrO_2 content and firing temperature on the densification and micro-structure development have been investigated by means of SEM, TEM and XRD. It was clarified that the 5 to 25 vol% addition of ZrO_2 to mullite improved the sinterability. The effect is more striking in the composites containing 10 or 15 vol% ZrO_2. The growth of mullite grains was inhibited by dispersing ZrO_2 particles. The effects were, especially, most predominant in the composite containing 15 vol% ZrO_2. However, in composites fired at 1650℃ and above, remarkable grain growth was observed, and needle-like mullite grains having Al-rich composition appeared. These results may be ascribed to the coalescence of fine ZrO_2 crystals.
社団法人日本セラミックス協会の論文
1991-09-01