アルミナパイクリスタルを用いた(0001)ねじれ粒界の破壊靭性の評価

概要

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Alumina bicrystals with (0001) twist boundary were fabricated by joining two alumina single crystals at 1900℃ in Ar flow in a tungsten furnace. Single edge V-notched plate tension method was applied to evaluate the fracture toughness of the twist boundaries of the bicrystals. The fracture toughness of glass and single crystal alumina was also measured to make sure the validity of this method. The measured fracture toughness of (0001) twist boundaries were 3.6 MPa√<m> at 0゜ twist angle, 2.8 MPa√<m> at 10゜, 2.1 MPa √<m> at 28゜, 1.8 MPa√<m> at 38゜ and 2.7 MPa√<m> at 60゜, respectively. The dependence of twist angle of fracture toughness of grain boundary of alumina was discussed with changes in surface energy, boundary energy and plastic dissipative energy.
社団法人日本セラミックス協会の論文
1998-04-01