Alumina Toughened Zirconia (ATZ) is a high-strength composite ceramic known for its superior toughness, wear resistance, and thermal stability. Combining zirconium dioxide (ZrO2) and aluminum oxide (Al2O3), this material has become a cornerstone in structural and biomedical applications that demand extreme durability and reliability.
Material Overview
ATZ is engineered by dispersing alumina particles within a fine-grained zirconia matrix, typically stabilized with yttria (Y2O3). The typical composition ranges from 70–80 wt% ZrO2 to 20–30 wt% Al2O3, achieving an optimized balance of hardness and fracture toughness. The addition of alumina limits grain growth during sintering and inhibits the transformation from tetragonal to monoclinic zirconia, thereby enhancing thermal stability and mechanical integrity. Recent studies have shown fracture toughness values up to 5.7 MPa·m1/2 and hardness exceeding 16 GPa (Zheng, 2022). This microstructural synergy allows ATZ to outperform monolithic zirconia or alumina ceramics in cyclic or impact-loaded environments.
Applications and Advantages
ATZ ceramics are used extensively in wear-resistant mechanical components, cutting tools, valve seats, and biomedical implants such as dental crowns and femoral heads. The combination of alumina’s hardness with zirconia’s transformation toughening gives ATZ superior crack resistance and dimensional stability. In dental materials research, ATZ composites have demonstrated strength retention above 700 MPa even after hydrothermal aging, maintaining surface integrity and opacity desirable for aesthetic applications (Piza et al., 2023). Additionally, their high Weibull modulus and low porosity make ATZ suitable for demanding structural roles in aerospace and automotive systems.
Goodfellow Availability
Goodfellow supplies Alumina Toughened Zirconia (ZrO2/Al2O3) in a range of customizable dimensions and research-grade purities. The material is available for academic research, prototyping, and industrial testing. Goodfellow’s catalogue supports custom configurations to meet specific thermal, mechanical, or dimensional requirements.
Explore Alumina Toughened Zirconia ATZ - ZrO2/Al2O3 - Material Information and other advanced materials in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Piza, M. M. T., Bergamo, E. T. P., Campos, T. M. B., et al. (2023). Alumina-toughened zirconia nanocomposite: Aging effect on microstructural, optical, and mechanical properties. Dental Materials. https://doi.org/10.1016/j.dental.2023.09.005
- Zheng, Y. (2022). Microstructural evolution and mechanical properties of nano-ATZ ceramics by solid solution precipitation. Journal of Materials Research and Technology. https://doi.org/10.1016/j.jmrt.2021.12.057
- de Sousa Lima, E. (2022). Development and characterization of alumina-toughened zirconia (ATZ) ceramic composites doped with a beneficiated rare-earth oxide extracted from natural ore. Journal of Materials Research and Technology. https://doi.org/10.1016/j.jmrt.2021.11.141
- Maji, A., & Choubey, G. (2018). Microstructure and mechanical properties of alumina toughened zirconia (ATZ). Materials Today: Proceedings. https://doi.org/10.1016/J.MATPR.2017.11.417