Mechanical properties of Y_2O_3-stabilized ZrO_2 polycrystals fabricated by the solid phase mixing and sintering method
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概要
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The flexural strength and fracture toughness of 2.8 mol% Y_2O_3-stabilized zirconia polycrystals were investigated. The polycrystals were fabricated by sintering powders prepared by two different methods; the solid phase method (SPM), which involved wet dispersing and mixing using an agitator mill, and the liquid phase precipitation method (LPM). In the case of the LPM sample, the compressive residual stress on the polished surface was lower than of the SPM sample and did not depend on the grain size, while the monoclinic phase fraction on the fracture surface increased with an increase in the grain size. By contrast, for the SPM sample, the compressive residual stress depended on the grain size, and the monoclinic phase fraction on the fracture surface revealed the tendency to decrease with an increase in the grain size. The flexural strength and fracture toughness of the LPM sample were greatly influenced by the stress-induced transformation. However, mechanical properties and transformation behavior of the SPM sample in relation to grain size implied that the SPM sample was dominated not only by the stressinduced transformation but also by the compressive residual stress and the microcracks generated by the transformation. For both SPM and LPM samples, the relationship between the transformed volume V_f√h, where V_f is the tetragonal phase fraction and h is the transformed depth, and the fracture toughness was linear. The fracture toughness for the SPM sample was more strongly influenced by V_f√h than that of the LPM sample.
- 社団法人日本セラミックス協会の論文
- 2008-03-01
著者
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SEKINO Tohru
The Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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NIIHARA Koichi
Extreme Energy-Density Research Institute, Nagaoka University of Technology
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Sekino Tohru
The Inst. Of Multidisciplinary Res. For Advanced Materials Tohoku Univ.
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Naka Hironori
Nikkato Corporation
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Niihara Koichi
Extreme Energy-density Res. Inst. Nagaoka Univ. Of Technol.
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Ohnishi Hiroshi
Nikkato Corporation
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IKUHARA Yuichi
Institute of Engineering Innovation, University of Tokyo
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Ikuhara Yuichi
Inst. Of Engineering Innovation The Univ. Of Tokyo
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Ikuhara Yuichi
Institute Of Engineering Innovation School Of Engineering The University Of Tokyo
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Ohnishi Hiroshi
Nikkato Corp. Osaka Jpn
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IKUHARA Yuichi
Institute of Engeering Innovation, School of Engineering, The University of Tokyo
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