MgO-ZrO_2焼結体の機械的強度に及ぼす粒径の影響

概要

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Cubic- and tetragonal-ZrO_2-MgO composite ceramics were prepared by the pressureless sintering at 1650℃ for 4 h and 1350℃ for 24 h respectively, and the effect of grain size and ZrO_2 phase on bending strength (at room temperature and 1200℃) was investigated. The bending strength at room temperature of ZrO_2-MgO composite ceramics increased with increasing ZrO_2 content, because the grain size of MgO decreased with ZrO_2 addition. But the effect of ZrO_2 phase on the bending strength at room temperature was not recognized. In the case of bending test at 1200℃, when grain size of MgO was below 6 μm, specimens deformed plastically before breakage, and the yield stress at 1200℃ of c-ZrO_2-MgO was larger than that of t-ZrO_2-MgO, and fracture stress increased with decreasing the grain size of MgO.
社団法人日本セラミックス協会の論文
1992-02-01