Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of a Li2O Additive on the Sintering Behavior of UO2 in the H2 and CO2 Atmospheres

  • Published : 2004.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

The variation of the sintered density and grain size of UO$_2$ as a function of the Li$_2$O amount and sintering atmosphere was observed. Li$_2$O enhanced the grain growth of the UO$_2$ pellet in H$_2$, but rather hindered it in $CO_2$ atmosphere. Grain size of the UO$_2$ and UO$_2$-0.1 wt%Li$_2$O pellets was, respectively, 8 $\mu$m and 100 $\mu$m at 168$0^{\circ}C$ in the H$_2$ atmosphere, and that of each pellet was, respectively, 24 $\mu$m and 17 $\mu$m at the same temperature in the $CO_2$ atmosphere. As-received Li$_2$O powder, which had been composed of Li$_2$O and LiOH, was converted to the Li$_2$CO$_3$ phase after heating to 80$0^{\circ}C$ in $CO_2$. On the other hand, the Li$_2$O and LiOH phases remained unchanged in H$_2$ atmosphere. In the H$_2$, the as-received Li$_2$O powder began to evaporate at about 105$0^{\circ}C$ and then about 20 wt% residue was left at 150$0^{\circ}C$. But, most of the Li elements evaporated at 150$0^{\circ}C$ in the $CO_2$ atmosphere.

Keywords

References

  1. J. Nucl. Mater. v.11 Xenon Diffusion in U0$_2$ Some Complication Factors J. R. MacEWAN;W. H. Stevens https://doi.org/10.1016/0022-3115(64)90123-0
  2. J. Nucl. Mater. v.71 A Review of the Diffusion Coefficient of Fission-Product Rare Gases in Uranium Dioxide G. T. Lawrence https://doi.org/10.1016/0022-3115(78)90418-X
  3. J. Nucl. Mater. v.95 The Irradiation Performance of Magnesia-Doped U0$_2$ Fuel P. T. Sawbridge;C. Baker;R. M. Cornell;K. W. Jones;D. Reed https://doi.org/10.1016/0022-3115(80)90087-2
  4. J. Nucl. Mater. v.116 U0$_2$ Fuel Pellet Microstructure Modification through Impurity Additions K. C. Radford;J. M. Pope https://doi.org/10.1016/0022-3115(83)90116-2
  5. AECL-1810 The Effect of TiO$_2$ and $Nb_2O_5$ Additions on the Irradiation Behavior of Sintered U0$_2$ R. D. Macdonald
  6. J. Nucl. Mater. v.98 Doping U0$_2$ with Niobia-Beneficial or Not H. Assmann;W. Dorr;G. Gradel;G. Maier;M. Peehs https://doi.org/10.1016/0022-3115(81)90401-3
  7. J. Kor. Nucl. Soc. v.26 no.4 Microstructure Development During Sin-tering of $Nb_2_5$-Doped U0$_2$ Pellets Under H$_2$and CO$_2$ Atmosphere K. W. Song;S. H. Kim;B. G. Kim;Y. W. Lee;M. S. Yang;H. S. Park
  8. AECL-2585 On the Effect of TiO$_2$ Additions on Defect Structure, Sintering and Gas Release of U0$_2$ H. J. Matzke
  9. J. Nucl. Mater. v.52 The Effect of Titania on Grain Growth and Densification of Sintered U0$_2$ J. B. Ainscough;F. Rigby;S. C. Osborn https://doi.org/10.1016/0022-3115(74)90167-6
  10. J. Nucl. Mater. v.20 On the Effect of TiO$_2$ Additions on Sintering of U0$_2$ H. J. Matzke https://doi.org/10.1016/0022-3115(66)90046-8
  11. J. Kor. Ceram. Soc. v.37 no.7 Effect of Additives on the Characteristics and Microstructure of U0$_2$ Pellet(in Kor.) H. S. Yoo;S. Y. Lee;S. J. Lee;K. H. Kang;H. S. Kim
  12. J. Kor. Nucl. Soc. v.28 no.5 Microstructural Analysis on U0$_2$ and U0$_2$-4 wt%CeO$_2$ by Using Additives in Reducing and Oxidizing Atmospheres H. S. Kim;S. H. Kim;Y. W. Lee;S. H. Na
  13. J. Nucl. Mater. v.150 Effects of Additives and Oxygen Potential on the Fission Gas Diffusion in U0$_2$ Fuel K. Une;I. Tanabe;M. Oguma https://doi.org/10.1016/0022-3115(87)90097-3
  14. J. Nucl. Mater. v.78 Mass-Spectrometric study of the Vaporization of Li$_2$O(s) and Thermochemistry of Gaseous LiO, Li$_2$O, Li$_2$O, and Li$_20_2$ H. Kudo;C. H. Wu;H. R. Ihle https://doi.org/10.1016/0022-3115(78)90460-9
  15. Chemical Reaction and Equilibrium Software with Extensive Thermochemical Database, Ver. 4.1 Outokumpu HSC Chemistry for Windows
  16. Liquid Phase Sintering R. M. German
  17. J. Nucl. Mater. v.30 Role of the O/U Ratio on the Sintering Behavior of U0$_2$ K. W. Lay;R. E. Carter https://doi.org/10.1016/0022-3115(69)90170-6
  18. J. Nucl. Mater. v.305 Densification Behavior of UO$_2$ in Six Different Atmospheres T. R. G. Kutty;P. V. Hedge;K. B. Khan;U. Basak;S. N. Pillai;A. K. Sengupta;G. C. Jain;S. Majumdar;H. S. Kamath;D. S. C. Purushotham https://doi.org/10.1016/S0022-3115(02)00934-0