多孔質アルミナの破壊強度特性とその統一的評価法

概要

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In order to study the applicability of a unified estimation method on evaluation of strength for porous Al_2O_3 ceramics used as refractories, various kinds of bending fracture tests, such as fast fracture, dynamic fatigue, cyclic fatigue and static fatigue tests, were carried out on 3 kinds of porous Al_2O_3 specimens. The main testing temperature conditions were room temp. and 1200℃ in atmosphere. Other temperature conditions of 600, 800, 1000, 1100℃ were added only in fast fracture tests. The strength data obtained were analyzed by use of a unified estimation method. The temperature dependence data were studied through Arrhenius plots. The results obtained were as follows: (1) The unified estimation method can be applied to the strength evaluation of porous Al_2O_3 at 1200℃ as well as room temperature. (2) The temperature dependence of fracture strength was distinctly different below and above 1000℃. Above 1000℃, the fracture strength decreased rapidly with elevating temperature. But below 1000℃, the fracture strength was about constant up to 500℃ and then increase slightly.
社団法人日本材料学会の論文
1991-07-15