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CHEN Lian-zhong, REN Yong-gang, LI Ai-jun, DU Ji-jun, GUO Hong. Study of High Temperature Sintering Technology for ThO2 Pellet[J]. Atomic Energy Science and Technology, 2015, 49(zengkan1): 438-442. DOI: 10.7538/yzk.2015.49.S0.0438
Citation: CHEN Lian-zhong, REN Yong-gang, LI Ai-jun, DU Ji-jun, GUO Hong. Study of High Temperature Sintering Technology for ThO2 Pellet[J]. Atomic Energy Science and Technology, 2015, 49(zengkan1): 438-442. DOI: 10.7538/yzk.2015.49.S0.0438
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Study of High Temperature Sintering Technology for ThO2 Pellet

  • China North Nuclear Fuel Co., Ltd, Baotou 014035, China

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  • For the preparation of ThO2 pellet meeting to heavy water reactor (HWR) fuel element technical requirements, ThO2 powder made by oxalic acid precipitation process was used as raw material. The ThO2 pellet was prepared through the granulating, pressing and sintering process. The effects of granulating, pressing and sintering process on the grain size and density were analyzed. The results indicate that the specific surface area of powder, press force and sintering temperature are the main effect factors of pellet density. The driving forces of ThO2 pellet sintering and grain growth increase with specific surface area of ThO2 powder, and the ThO2 pellet with larger grain size can be acquired by using the higher specific surface area of ThO2 powder. The ThO2 pellet which can meet the HWR fuel element technical requirements of density and grain size can be prepared under the vacuum or argon atmosphere and high sintering temperature.
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    李冠兴，任永岗.重水堆燃料元件[M]. 北京：化学工业出版社,2007.
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    冉旭，刘勇兵，闫海峰，等. 纳米Cu的SPS烧结与晶粒长大行为的研究[J]. 材料科学与工艺，2005，13(5):484-487.RAN Xu, LIU Yongbing, YAN Haifeng, et al. Study of grain growth and spark plasma sintering of nanocry stalline Cu powder[J]. Material Science and Technology, 2005, 13(5): 484-487(in Chinese).
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