安定化ZrO_2焼結体の微粒化とその機械的特性への影響

概要

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In order to investigate the effect of grain size on the mechanical properties of stabilized ZrO_2 ceramics, fine grained ceramics were prepared by adding carbon derived from novolak phenol resin by thermal decomposition. A stabilized ZrO_2 ceramic with an average grain size of 0. 6 μm and relative density of above 99% was obtained by adding 0.23 wt% of carbon and sintering at 1500℃. It was speculated that the carbon at grain boundaries prevents the grain growth of ZrO_2. Hardness and Young's modulus of the fine grained ZrO_2 ceramics were nearly the same as those with large grains. However, the fracture toughness of the fine grained ZrO_2 was smaller than that of large grained one, which may have resulted from the reduced crack deflection effect of increasing fracture toughness in fine grained ZrO_2 ceramics.
社団法人日本セラミックス協会の論文
1988-10-01