Abstract
Femtosecond lasers were used to cut ultra-sharp V-notches (ρ<0.5µm) on the yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP). The actual fracture toughness of Y-TZP ceramics is 4.4MPa/m1/2 measured by SEVNB method. As comparison, the fracture toughness values of Y-TZP samples with different U-groove width were measured by SENB method. The fracture toughness value with U-groove width of 200µm is 13.1MPa/m1/2, which is about 3 times than the value with ultra-sharp V-notch. In addition, fracture toughness values of the Y-TZP ceramics with different notch depth were studied. To obtain the actual fracture toughness of Y-TZP ceramics with ultra-sharp V-notch, the ratio of notch depth to sample height (a/W) should be controlled in 0.25–0.6.
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