| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Preparation of the ZTA Ceramic with High Strength & Toughness and Thermal Conductivity via Dispersive Characteristic Optimization of t-ZrO2 |
| NIE Guanglin1,2,*, LIU Leiren3, LIU Yijun1,2,*, ZUO Fei3, WANG Qinggang1,2, WU Yang1,2, HUANG Lingyan1,2, BAO Yiwang4
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1 Monalisa Group Co., Ltd., Foshan 528211, Guangdong, China
2 Guangdong Provincial Key Laboratory of Large Ceramic Plates, Foshan 528211, Guangdong, China
3 School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
4 State Key Laboratory of Green Building Materials, China Building Materials Academy Co., Ltd., Beijing 100024, China |
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Abstract The simultaneous enhancement of mechanical and thermal properties is conductive to the service safety and reliability of zirconia toughened alumina (ZTA) ceramic substrates. In this work, a non-aqueous precipitation coating process (CP) was employed to enhance the dispersive uniformity of t-ZrO2 in ZTA ceramics. Then the effects of the dispersive characteristic of t-ZrO2 on the microstructure, phase composition, residual stress distribution, three-dimensional profile of fracture surface, mechanical and thermal properties of ZTA ceramic were investigated. The results show that the dispersive characteristic optimization of t-ZrO2 contributes positivity to uniforming and refining the microstructure of ZTA ceramic, increasing the residual compressive stress at Al2O3 grain boundary, enhancing the phase transformability of t-ZrO2 particles and prolonging the crack propagation path. Consequently, the synergistic actions of grain refinement strengthening, phase transformation strengthening, residual stress strengthening and crack deflection toughening can be achieved, which are responsible for enhancing the bending strength, fracture toughness and reliability of ZTA ceramics. Moreover, the dispersive characteristic optimization of t-ZrO2 can promote the formation of isolated second t-ZrO2 phase, which is beneficial for weakening the deterioration effects of fine grains and second phase to degrade thermally conductive property on the thermal conductivity of ZTA ceramic, and thereby improving the thermal conductivity of ZTA ceramic. Finally, the ZTA ceramic with excellent comprehensive mechanical and thermal properties were successfully prepared using the CP method, and it’s bending strength, fracture toughness, thermal conductivity and Weibull modulus reaches (669.11±42.35) MPa, (7.02±0.38) MPa·m1/2, (29.81±0.28) W·m-1·K-1 and 18.62, respectively, demonstrating that the dispersive characteristic optimization of t-ZrO2 is crucial for the fabricating ZTA ceramics with high mechanical strength, toughness, reliability and thermal conductivity.
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Published:
Online: 2025-05-29
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2025, Vol. 39 
