Low-temperature reactive hot-pressing of cerium-doped titanate composite ceramics and their aqueous stability |
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| Affiliation: | 1. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China;2. Computational Physics Key Laboratory of Sichuan Province, Yibin University, Yibin 64000, PR China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, China;2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;1. State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;1. State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010 China;2. State Nuclear Power Research Institute, Beijing, 100029 PR China |
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| Abstract: | Reactive hot-pressing was scarcely applied to fabricate titanate ceramic waste forms designed for immobilizing high-level radioactive waste (HLW). However, compared with non-reactive processes, there is an advantage of producing high-density ceramics at reduced temperatures by reactive hot-pressing. CeIV-doped titanate composite ceramics with relative densities in excess of 99% were prepared by reactive hot-pressing at temperature as low as 1150 °C and pressure of 30 MPa for 1–4 h. The results show that low-temperature densification of the composite ceramics might be attributed to the plastic deformation under hot-pressing condition. In addition, aqueous stability testing was carried out using the standard MCC-1 static leach test method. The results demonstrate that the normalized elemental leach rate of Ca, Ce and Zr were fairly constant in a low value below 5 × 10?2 g m?2 d?1, 7 × 10?6 g m?2 d?1 and 6 × 10?6 g m?2 d?1 after 21 d. |
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| Keywords: | Hot-pressing Cerium Titanate Zirconolite Aqueous stability |
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