Effect of Al 2 O 3 on the Process Performance of ZrO 2 Microspheres
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https: //doi. org/10.1007/s11595-020-2328-z
Effect of Al2O3 on the Process Performance of ZrO2 Microspheres GUO Ting1, WANG Chen2, DONG Limin1, LÜ Jinlong2, LIANG Tongxiang1*
(1. State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China)
3+ Abstract: Al2O3-ZrO2 microspheres were prepared by internal gelation method. The effects of Al on 3+ the stability of solution and performance of gel spheres were studied. Al had a great influence on the stability of the solutions, and the more of the amount of Al3+, the shorter of the stabilization time. Because Al3+ did not copolymerize with Zr4+ during the sol-gel transformation, the strength of gel sphere added with Al3+ was low and deformed easily as it was squeezed. The results of our experiments well verify Glasser team's speculation and conclusions. At the same time, based on the experimental results, we prepared Al2O3-ZrO2 composite microspheres with higher content of Al2O3 by controlling the pH of the solution. The change curve of viscosity with time and the stabilization time of the solution with different Al3+ dosage were given, which could provide references for industrial mass production. Samples without hydrothermal treatment cracked severely, while the samples hydrothermally treated kept structural integrity with no cracks after calcined. Al2O3-ZrO2 microspheres with no segregation and phase separation were prepared and alumina evenly distributed in the zirconia matrix. When the content of Al2O3 was low, the tetragonal phase was stable. And the cubic phase was obtained when the content of Al2O3 was more. Key words: solution stability, gelation time, Al2O3-ZrO2 microspheres
1 Introduction Each year, thousands of tons of highly radioactive nuclear wastes are generated, which are buried in deep sea or deep stratum by traditional disposal method. Due to the instability of crustal movement, this method has great risks. Partitioning and transmutation can effectively reduce the amount of nuclear waste, greatly reduce the radioactivity and improve the utilization of nuclear fuel[1-5]. The long-term risk of nuclear waste is determined by the long life and highly radioactive waste, mainly including the minor actinides (MA, e g, Np, Am, Cm) and other long-lived fission products (LLFPs)[6,7]. The reactor fuel UO2 will produce 239Pu and new minor actinides after irradiated, limiting its
© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 29, 2019; Accepted: July 18, 2020) GUO Ting(郭婷): Ph D; E-mail: [email protected] *Corresponding author: LIANG Tongxiang(梁彤祥): Prof.; Ph D; E-mail: [email protected] Funded by National Natural Science Foundation of China (No. 91326203)
use as a transmutation element matrix[8]. Therefore, it is necessary to use inert matrix fuel (IMF), such as
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