The Effects of Different Nucleation Agents on the Crystallization Behavior and Chemical Stability of the Zirconolite-based Borosilicate Glass-Ceramics
GENG Andong1,2, ZHU Yongchang1,2, CUI Zhu2, ZHANG Hao2, ZHU Hanzhen1, HAN Xu2, HUO Jichuan1
1 State Key Laboratory of Environmentally-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621900; 2 China Building Materials Academy, Beijing 100024
Abstract: The zirconolite-based borosilicate glass-ceramics containing 24wt% simulated nuclear waste was prepared by the “one-step” thermal treatment, from the perspective of crystallization kinetics, the action of the solidified bodies’ crystallization behavior and the effect of chemical stability under different nucleation agent (Fe2O3, Cr2O3, P2O5, CaF2) were investigated. As a result, the addition of Cr2O3 has led to the precipitation of tabular CaZrTi2O7 crystals and the energy E of crystallization activation decreased from 218 kJ/mol to 128 kJ/mol, and promoting the simulated nuclide remaining in the glass matrix to fuse into the precipitated crystal phase, yet other nucleation agents did not produce obvious effect. The MCC-1 experiment of glass-ceramics showed that the excellent leaching resistance and chemical stability under the impact of Cr2O3, and the normalized leaching rate of Ce below 10-7 g·m-2·d-1 after 7 d.
耿安东, 朱永昌, 崔竹, 张浩, 竹含真, 韩勖, 霍冀川. 不同晶核剂对硼硅酸盐钙钛锆石固化体析晶行为及化学稳定性的影响[J]. 材料导报, 2018, 32(22): 3979-3983.
GENG Andong, ZHU Yongchang, CUI Zhu, ZHANG Hao, ZHU Hanzhen, HAN Xu, HUO Jichuan. The Effects of Different Nucleation Agents on the Crystallization Behavior and Chemical Stability of the Zirconolite-based Borosilicate Glass-Ceramics. Materials Reports, 2018, 32(22): 3979-3983.
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2018, Vol. 32 
