Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 1, Pages 706-718Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.08.026
Keywords
Zirconia; Whiskers; Stabilizer; Sintering; Mechanical properties
Categories
Funding
- Guangdong Innovative and Entrepreneurial Research Team Program [2013G061]
- Opening Project of State Key Laboratory of Green Building Materials [2019GBM03]
- Science and Technology Program of Guangzhou [201904010357]
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This study systematically compared the effects of different whisker lengths on the Al2O3 whisker-reinforced 3Y-TZP and 12Ce-TZP composites, revealing that changes in whisker length can impact the toughening and strengthening results.
The densification behavior, microstructural development, toughening and strengthening mechanisms of Al2O3 whisker-reinforced 3Y-TZP and 12Ce-TZP composites were systematically and comparatively investigated with varying whisker lengths. Compared with 3Y-TZP/A(w) composites, the presence of a Ce-Al-Si-O amorphous phase, caused by the addition of Al2O3 whiskers, promoted the densification and grain growth of 12Ce-TZP/A(w) composites. Crack deflection and bridging are proposed as the primary toughening mechanisms for 3Y-TZP/A(w) composites, while the t-m martensitic transformation would dominate the toughening and strengthening processes of 12Ce-TZP/Aw composites. Changes in Al2O3 whisker length would vary the distributions of internal stress and amorphous phase within the ceria-stabilized ZrO2 matrix, and hence affect the toughening and strengthening results. It indicates that effective toughening and strengthening of the Al2O3 whisker-reinforced TZP composites can be achieved by taking advantage of collaborative engineering control on the reinforcement morphology and the interface chemistry/structure.
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