Abstract
Y-TZP(Yttria-stabilized Tetragonal Zirconia Polycrystal) ceramics are of great interest as engineering and structural materials due to their excellent mechanical properties arising from transformation toughening, it is also reported that the 3Y-TZP(3 mol% Yttria-stabilized Tetragonal Zirconia Polycrystal) has the best mechanical properties on Y-TZP ceramics. But to use widely for engineering and structural materials, it remains an important challenge to be able to improve its fracture toughness. In order to produce the 3Y-TZP ceramics showing much better mechanical properties, milling method adding monoclinic zirconia to 3Y-TZP was adopted and the resultant mechanical properties containing apparent density and fracture toughness were measured by using proper techniques. Experimental results showed that the 3Y-TZP specimen containing 33 wt% of monoclinic zirconia, which was sintered at 1450℃, has the highest fracture toughness value of 11.38 MPa·m 1/2 which is three times higher than that of normal 3Y-TZP ceramics.
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