ジルコニア耐火物の強度特性に及ぼす気孔率の影響

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Flexural strength tests and fracture toughness tests were conducted using 3wt-% MgO partially stabilized zirconia refractories, and a statistical analysis was made on the dependency of strength properties upon porosity. Six kinds of materials with porosity of 5.2, 5.8, 6.6, 7.3, 8.1 and 9.5 % were prepared in this study. The flexural strength tests were carried out under 3-point bending, and the fracture toughness of the material was investigated under 3 and 4-point bending using a single-edge notched beam method. The flexural strength and the fracture toughness obtained under 4-point bending decreased in a more porous material, while the variation of porosity did not affect the fracture toughness obtained under 3-point bending. When the Weibull function with two parameters, i. e. shape and scale parameters, was employed to present the flexural strength distribution, the result for the material with higher porosity indicated larger shape parameter and smaller scale parameter. The statistical properties of strength were discussed based on a fractographic observation through a scanning electron microscope. It was found from the observation that the scatter in strength properties of the tested zirconia refractory was dependent on the characteristics of pore distribution, especially the formation of pore clusters, in the tested individual specimens. A fracture mechanics procedure was not necessarily applicable to explain fracture behaviors of porous refractories.
社団法人日本材料学会の論文
1988-10-15

ジルコニア耐火物の強度特性に及ぼす気孔率の影響

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