A New Aspect of Grain Growth of Sol-Gel Urania

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概要

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• Grain growth in sol-gel urania compacts was determined as a function of temperature by observing with scanning electron microscope the fractured surface of compacts heated up to predetermined temperatures at a constant rate of heating. Rapid grain growth, unexplainable by currently accepted square or cubic growth kinetics, was observed to occur in the sintered compact when the density reached 70 to 75%T.D., which was attained at about 1, 000°Cin the case of heating rate of 5°C/min. It was considered that this rapid grain growth proceeded by plastic flow of which driving force was the surface tension of the grains, when a large number of primary grains were closely packed against each other, <I>i.e.</I>, arranged in quite high coordination number. A rough estimation showed that the rate of coalescence of grains was dependent on the temperature and the grain size or the surface tension of the material, and that the multi-grain-coalescence model, which was previously reported for the case of sintering of BeO, could also be applied to sol-gel urania.

• 一般社団法人 日本原子力学会の論文

著者

• ISEKI Takayoshi

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

• SUZUKI Hiroshige

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

• HASE Teizo

  Research Laboratory of Nuclear Reactor, Tokyo Institute of Technology

• ISEKI Takayoshi

  Research Laboratory of Nuclear Reactor,Tokyo Institute of Technology

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• A New Aspect of Grain Growth of Sol-Gel Urania

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