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The effect of the amount of Al 2 O 3  content on microstructure, tetragonal phase stability and mechanical properties of 3YSZ-Al 2 O 3  composites are investigated in this study. The ceramic composites are obtained by means of uniaxial compacting at 210 MPa and green compacts are sintered at 1550 °C for 3 h in air. The monoclinic zirconia (m-ZrO 2 ) phase has completely been transformed into tetragonal zirconia (t-ZrO 2 ) phase with corresponding higher Al 2 O 3  content. The t-ZrO 2  grains induce transgranular fracture mode that has contribution in improvement of fracture toughness. The maximum flexural strength of 340 MPa, Vickers hardness value of 14.31 GPa and fracture toughness of 5.1 MPa × m 1/2  in the composition containing 40 wt.-% Al 2 O 3  is attributed to the microstructure with t-ZrO 2  grains as inter- and intragranular particles in the Al 2 O 3  grains, which makes it suitable for dental applications.

Influence of Al 2 O 3 addition on microstructure and mechanical properties of 3YSZ-Al 2 O 3 composites