Monoclinic phase-free,low temperature spark plasma sintering of CeO2-doped ZrO2 ceramics and its associated benefits on mechanical properties |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China;2. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin 300072, China;1. College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia;2. College of Medicine and Dentistry, James Cook University, Smithfield, QLD 4878, Australia;1. School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China;2. School of Mechanical Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, China;1. School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;2. Centre of Excellence for Advanced Materials, Dongguan 523808, China |
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| Abstract: | Consolidating a CeO2-doped ZrO2 ceramics, free from monoclinic phase using spark plasma sintering (SPS) is a major challenge faced by previous researchers; Ce+4 → Ce+3 conversion under reducing environments was assigned as the prime factor. We report dense (> 95 % of theoretical density) 20 mol. % CeO2-doped ZrO2 ceramics, free from monoclinic phase and any of micro/ macro-cracks via SPS. The sintering temperature (1175 ℃) used for the present work was the lowest compared to previous reports on the same system. Phase analysis revealed a mixture of tetragonal (major phase) and cubic phase (minor). No depletion of cerium (Ce) from the ZrO2 matrix and no additional/impurity phases were noted after SPS; a common issue that has been observed in most of the previous works. Sintered ceramics showed appreciably high hardness (>11 GPa); the obtained toughness was in-between of tetragonal and cubic CeO2-ZrO2 ceramics. |
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| Keywords: | Spark plasma sintering Monoclinic Hardness Toughness |
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