Effect of the Al2O3 Content on the Mechanical Properties and Microstructure of 3Y-TZP Ceramics for Dental Applications

다국어 초록 (Multilingual Abstract)

Alumina-reinforced zirconia composites containing 0 to 30 vol% of alumina were fabricated by sintering at 1550°C for 2h in air. The effect of the Al2O3 content on the mechanical properties and microstructure of 3Y-TZP ceramics was investigated. Al2O3 acted as an inhibitor of the grain growth of 3Y-TZP. As the alumina content increased, the fracture mode changed gradually from the transgranular mode to the inter-granular mode and the Young’s modulus and hardness increased. The biaxial flexural strength also showed a slight increase with an increase in Al2O3 content, due to the grain size refinement of the ZrO2 matrix,while the fracture toughness, which was investigated by the SEVNB method, showed a contrary ten-dency. The decrement of the fracture toughness can be explained by the increase in the critical transforma-tion stress, the decrease in the volume fraction of the transformable t-ZrO2 and the increase in the tensile residual stress.

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