Composition Optimization of Zirconia Toughened Alumina for Dental Ceramics


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The aim of this study was to optimize sintering aids and processing parameters for zirconia toughened alumina (ZTA) nano-ceramics with optimal properties as dental ceramics. Additive agents (TiO2, MgO, SiO2), dry pressing forces and sintering temperatures are very important for preparation of structural ceramics. In the present study, density and Vickers hardness measurement, SEM, and XRD analysis were employed to investigate the effects of these on the final products. The relevant results showed that higher pressing force led to an increase in the density and Vickers hardness of the sintered ceramics. Among the four groups of sintered nanoceramics with different ratios of alumina and zirconia, and combinations of additive agents, the best densification was achieved in the sample from Group 2# containing 1.05wt% MgO after sintered at 1450°C, as indicated by SEM observation. XRD analysis confirmed the formation of MgAl2O4 as an intermediate compound. The existence of TiO2 in the additive agents was in favor of the acquisition of high densification. The measured values for the density and Vickers hardness indicated that the sintered ZTA nano-ceramics would be a potential material for dental prosthetic applications.



Key Engineering Materials (Volumes 330-332)

Main Theme:

Edited by:

Xingdong Zhang, Xudong Li, Hongsong Fan, Xuanyong Liu




J. Ma et al., "Composition Optimization of Zirconia Toughened Alumina for Dental Ceramics", Key Engineering Materials, Vols. 330-332, pp. 1369-1372, 2007

Online since:

February 2007




[1] Christensen GI., J Am Dent Assoc, Vol. 128(1997), p.1315.

[2] Lawn BR, Deng Y, Lloyd IK, et al.: J Den Res, Vol. 81(2002), p.433.

[3] Ebadzadeh T. : Ceramics International, Vol. 31 (2005), p.1091.

[4] Ruqin Gao, Jiandong Wan: Advanced Ceramics, Vol. 3(2000), p.23.

[5] Liming Hu, Wei Shen: Chemical Production and Technology. Vol. 4 (1996), p.1.

[6] Kerkuijk B, Winnubst L, Mulder EJ, et al.: J Am Ceram Soc, Vol. 82(1999), p.2087 Figure 4 XRD patterns of the sample from Group 2# sintered at 1450.