Activated sintering of ThO2 with Al2O3 under reducing and oxidizing conditions

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  • KUL - Katholieke Universiteit Leuven

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Abstract

The effect of Al2O3 as non-soluble sintering aid of coarse-grained and fine-grained ThO2 has been explored under oxidizing and reducing atmospheres. It was found that Al2O3 increases the sinterability of coarse-grained ThO2 powder substantially under both oxidizing and reducing conditions. Sintering of fine-grained ThO2 powder based pellets resulted in slightly lower densities upon doping with Al2O3 compared to the undoped system. Precise X-ray diffraction analysis of the unit cell parameter and microprobe investigations ascertained that Al is not incorporated in the ThO2 matrix under any of the experimental conditions. X-ray diffraction measurements on the sintered ThO2 gave 559.74 +/- 0.01 pm as the cubic unit cell parameter. It was further observed that the sintering atmosphere has a limited, but measurable effect in the late sintering stage of pure ThO2.

Details

Original languageEnglish
Pages (from-to)34-43
Number of pages9
JournalJournal of Nuclear Materials
Volume470
DOIs
Publication statusPublished - 1 Mar 2016

Keywords

  • Significant , sintering improvement, doping , Al2O3, solubility, Th2O3, reducing, Atmonsphere, pure

ID: 2995090