アルミナ多結晶体の破壊靭性の粒径依存性

概要

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To investigate effects of grain size and temperature on the fracture toughness (K_<IC>) of polycrystalline alumina ceramics, the K_<IC> of high purity polycrystalline alumina having various grain sizes was measured using a single edge notched beam technique from room temperature to 1500℃. The material with grain size of 2 μm revealed the largest K_<IC> values over the temperature range studied. The K_<IC> values of polycrystalline alumina decreased with increasing grain size. The decreasing rate of K_<IC> values with increasing grain size changed around 22 μm at room temperature and 500℃ and around 16 μm from 1000° to 1500℃. The K_<IC> values of polycrystalline alumina having grain sizes over the range studied decreased with increasing temperature. For the grain size up to 42 μm, the decreasing rate of K_<IC> values at temperature up to 1000℃ was smaller than that above 1000℃. On the other hand, the K_<IC> values of the polycrystalline alumina having grain size of 70 μm decreased slightly with increasing temperature and tended to increase at 1500℃. This trend might be attributed to be related to the interaction between fracture surfaces.
社団法人日本セラミックス協会の論文
1991-07-01