Effect of Pre–oxidation Powders on Sintering Properties of Uranium Dioxide Pellets

Chin J Mater Res

2012, Vol. 26

Issue (3): 279-283 DOI:

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Effect of Pre–oxidation Powders on Sintering Properties of Uranium Dioxide Pellets

GAO Jiacheng¹, WU Shufang¹, YANG Xiaodong², CHANG Xin²

1.College of Material Science and Engineering, Chongqing University, Chongqing 400045
2.Yibin Nuclear Fuel Company, Yibin 644000

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GAO Jiacheng WU Shufang YANG Xiaodong CHANG Xin. Effect of Pre–oxidation Powders on Sintering Properties of Uranium Dioxide Pellets. Chin J Mater Res, 2012, 26(3): 279-283.

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Abstract The rationship between surface pre-oxidation and low-temperature sintering of uranium dioxide powders was studied in this paper. The oxidation processess of uranium dioxide powders in air were analyied by DSC-TG.Morphology, phases and properties of modified powders were tested by SEM, XRD and BET. Sintering properties of uranium dioxide powders before and after modification were compared and researched by thermal expansion instrument. The Results show that a process of 240℃×8h in air is a better process to surface modify uranium dioxide powders in our conditions. Beginning shrinkage temperature of modified powser pellets in Ar decresed from 1096-1171℃to 572-576℃, average line shrinking rate increased from 151.5266×10-6/K to 308.2275×10-6/K, density of the uranium dioxide pellets increased also from 8.52g/cm3 to 9.44g/cm3. Obviously, sintering densitying of modified powders is more rapid and higher than before. Density of the modified powders sintered pellets at 1300℃×5h/N2+5%CO2-1500℃×1h/H2 is 10.26 g/cm3。

Key words: inorganic non–metallic materials uranium dioxide surface modification pre–oxidation low–temperature

Received: 08 August 2011

ZTFLH:

TL211

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Supported by National Natural Science Foundation of China No.50874126.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2012/V26/I3/279

1 LI Rui, GAO Jiacheng, YANG Xiaodong, Development of sintering processes of uranium dioxide nuclear fuel pellets, Materials Review, 20(2), 91(2006)

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(高家诚, 杨晓东, 李锐, 二氧化铀芯块低温烧结机理的研究, 功能材料, 37(8), 1298(2006))

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(王良芬, 二氧化铀高温蠕变性能的研究, 硕士学位论文, 重庆大学(2008))

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(杨晓东, 高家诚, 伍志明, 二氧化铀芯块的低分压氧化性气氛烧结, 原子能科学技术, 40(6), 682(2006))

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13 GAO Jiacheng, WANG Yong, WU Shufang, Method on surface oxidation treatment of uranium dioxide powders, ZL200810069503.9, 2010–06–16

(高家诚, 王勇, 吴曙芳, 二氧化铀粉末表面氧化处理的方法, ZL200810069503.9, 2010--06--16)

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(张立雄, 谭耘, 八氧化三铀粉末制备与利用, 原子能科学技术, 40(5), 574(2006))

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(李会谦, 林涛, 郭志猛, 吴成义, 罗骥, 纳米钨粉的烧结工艺, 北京科技大学学报, 30(3), 272(2008))

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