多結晶アルミナの破壊エネルギーの粒径依存性

概要

論文の詳細を見る
To investigate the effect of grain size and temperature on the fracture energy (γ_<ess>) of polycrystalline alumina ceramics, γ_<eff> of sintered pure alumina bodies having various grain sizes was measured by work of fracture test from room temperature to 1600℃. At room temperature, γ_<eff> of polycrystalline alumina increased and then decreased with increase in grain size of alumina, passing through a maximum at the grain size around 16 μm . The values of γ_<eff> and its grain size dependence for polycrystalline alumina agreed well with the literature data obtained from work of fracture test. The grain size, which gives a maximum in the γ_<eff> values, shifted from 16 to 42 μm at 1200℃. γ_<eff> of alumina bodies having grain size of 2 μm showed no significant variations up to 1200℃, but increased extremely over 1400℃. γ_<eff> of alumina bodies having grain sizes of 16, 22 and 42 μm passed through maxima at 1000°and 1200℃, and remarkable increases in γ_<ess> were observed at 1500° and 1600℃. On the other hand, γ_<ess> of an alumina body having grain size of 70 μm was smaller than that of other bodies and decreased gradually up to 1500℃ and increased at 1600℃.
社団法人日本セラミックス協会の論文
1988-05-01