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Enhanced Fracture Strength and Toughness of Zirconia by Coating the Pre-Stressed Mullite-Zirconia

J. Zhijie, J. Zhijie, F. Shuai, L. Haiyan, B. Yiwan, Z. Cheng, W. Detian

Journal of Ceramic Science and Technology, Vol. 15, No. 1 (2024), pp. 21-28

DOI: 10.4416/JCST2023-00016

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Abstract

In this work, we prepared mullite-zirconia/zirconia pre-stressed composites with excellent mechanical properties by means of pressureless sintering. Both the strength and toughness of zirconia could be significantly enhanced with the application of a pre-stressed coating. The optimal mechanical properties were obtained when the content of mullite in the coating was 40 wt%. The corresponding flexural strength and fracture toughness were 1250.48 ± 43.81 MPa and 12.39 ± 0.87 MPa·m1/2, an improvement of 39.15 % and 26.8 % compared with the values of zirconia, respectively. Basis for this reinforcement mechanism is that the achieved residual compressive stresses in the mullite-zirconia coating can simultaneously improve the strength and prevent crack propagation. The outstanding properties of mullite-zirconia/zirconia pre-stressed composites make these promising candidates for advanced manufacturing.

Keywords

Pre-stressed strengthening, zirconia ceramics, mechanical properties, mullite

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