2mol%イットリア添加正方晶ジルコニアの250℃での静的疲労

概要

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Fatigue behavior of tetragonal zirconia polycrystals (TZP) containing 2 mol% Y_2O_3 with au average grain size of 0.46 μm was studied by measuring the failure time t_f as a function of applied stress σ from 525 to 710 MPa at 250℃ (static fatigue technique) . A Iinear relationship was observed between log a and log t_f for applied stress over 560 MPa. The crack growth parameter N obtained from the slope was 10.8, smaller than the N value (21.9) from dynamic fatigue. However, the log a and log t_f relationship under 560 MPa deviated from the linear relationship and showed a tendency corresponding to fatigue limit. The monoclinic zirconia contents on the fracture surface increased with increasing holding time and reached the maximum value (72%) in 9 hours. The maximum value was kept up to 29 hours. However, if failure time was longer than 29 hours, the monoclinic zirconia content decreased with increasing failure time. Fatigue fracture surface increased with increasing failure time.
社団法人日本セラミックス協会の論文
1988-08-01