Production of (Th,U)O2 microspheres with uranium content of 0-35% by sol-gel process using CCl4 as gelation media.
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概要
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Microspheres of (Th, U)O<SUB>2</SUB> with 040% U and with 0.31.3 mm diameter are produced through gelling source-sol drops in CC1<SUB>4</SUB>-ammonia media, and also their characteristics are measured.<BR>Their sphericity becomes worse with increasing U content or with decreasing colloid fraction of source sols ; this is due to greater shrinkage which occurs anisotropically on the gelation. So, acceptable microspheres are obtained for U content up to 35% but not for 40% U. The shrinkage also makes microsphere surface rougher for higher U content ; this is clarified by comparing their BET and geometrical surface areas and by observing them with a microscope. Their apparent and bulk densities are measured and compared. Microspheres are easily sintered up to 98% T. D. for mixed oxides but not for ThO2; densities of the latter are scattered from 87 to 99% T. D. For all including ThO<SUB>2</SUB> with such low densities, open porosity is less than 1% T. D.
- 一般社団法人 日本原子力学会の論文
著者
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Takahashi Yoshihisa
Department Of Chemistry And Fuel Research Japan Atomic Energy Research Institute
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Yamagishi Shigeru
Department Of Chemistry And Fuel Research Japan Atomic Energy Research Institute
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