イットリア添加正方晶ジルコニアの疲労に対する水の影響

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Fatigue behavior of 3 mol% Y_2O_3 containing tetragonal zirconia polycrystals was studied in water at 20° and 95℃, and in air at 95℃ by measuring the fracture stress (σ_f) as a function of stressing rate (σ^^.) (dynamic fatigue technique) . The grain size of the specimens was 0.5 μm (Z3Y-Ib) and 1.12 μm (Z3Y-IIb). There were linear relationships between log af and log & in the whole range of crosshead speed (0.005 mm/min to 50 mm/min) in water at 20℃. Crack growth parameters N obtained from their slopes were 47.8 for Z3Y-Ib and 47.5 for Z3Y-IIb, and fatigue of their specimens was slight. For Z3Y-Ib, there was a linear relationship between log σ_f and log σ^^. at crosshead speed of 0.005 mm/min to 50 mm/min in air at 95℃, too. The N value obtained from the slope was 46.4 indicating slight fatigue. On the other hand, fracture stress in water at 95℃ showed a constant value above the crosshead speed of 0.5 mm/min even if stressing rate increased. However, the relationship between log σ_f and log σ^^. below 0.5 mm/min was similar to that at 20℃. For Z3Y-IIb, fracture stress in air at 95℃ showed a constant value above crosshead speed of 0.5 mm/min. However, there was a linear relationship between log σ_f and log σ^^・ below 0.5 mm/min and the slope was similar to that at 20℃. The fracture stress of Z3Y- IIb in water at 95℃ showed a constant value at the crosshead speed of 0.005 to 50 mm/min. The constant value in water was less than that in air.
社団法人日本セラミックス協会の論文
1988-12-01

イットリア添加正方晶ジルコニアの疲労に対する水の影響

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