Effect of Nano-Al₂O₃ on the Microstructure and Properties of ZrO₂ Dental Materials Prepared by Microwave Sintering

Abstract:

Al₂O₃(x)/ZrO₂ composite ceramics were successfully prepared by microwave sintering. The influence of variety content of nanoAl₂O₃ on mechanical properties and microstructure of ZrO₂ dental materials were studied, and analysied the mutual relations of chemical composition, mechanical properties and microstructure to investigate the reason of strengthening and toughening. Results indicated that The relative density of the Al₂O₃(x)/ZrO₂ composite ceramics reached more than 96.8%.The HV hardness ,bending strength and fracture toughness presented excellent mechanical properties as 12.5GPa, 753.8MPa and 11.8MPa·m^1/2 with the content of nanoAl₂O₃ was 7.5%. Compared with that of pure ZrO₂ ceramics, the bending strength and the fracture toughness were improved 19% and 96%, respectively. The main crystal phases in this composite ceramics were t-ZrO₂ and α-Al₂O₃.The nanoAl₂O₃ have a obvious effect on the strength and toughness of ZrO₂ based ceramics. The reason of strengthening and toughening mainly the additions reduced the ZrO₂ grains growth and promoted grains size uniformity, and changed the fracture mode from transgranular fracture to intergranular fracture characteristics.

• Periodical: Applied Mechanics and Materials (Volume 618)
• Pages: 3-7
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.618.3
• Online since: August 2014
• Authors: Yun Long Ai*, Xiang Hua Xie, Wen He, Bing Liang Liang, Wei Hua Chen
• Keywords: Microwave Sintered, Nano-Al₂O₃, Properties, ZrO₂ Dental Materials

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