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Thermal diffusivity measurement of (U, Pu)O$$_{2-x}$$ at high temperatures up to 2190 K

2190K以下の高温における(U,Pu)O$$_{2-x}$$の熱拡散率測定

森本 恭一 ; 加藤 正人   ; 小笠原 誠洋*

Morimoto, Kyoichi; Kato, Masato; Ogasawara, Masahiro*

Pu含有率が約30%のMOX試料について2150Kまでの熱拡散率測定を実施した。熱拡散率は温度の上昇に従って低下する傾向を示した。また、初期O/M比=2.00の試料では測定中にO/M比が低下し、この原因は試料の構成元素の蒸発によるものと推測した。初期O/M比=1.95以下の試料については大きなO/M比及び重量の低下は示されなかった。

In this study, measurement was conducted for the sliced MOX pellets containing 30% of Pu prepared by a conventional powder metallurgy technology. Oxygen-to-metal (O/M) ratios of the samples were adjusted in the range from 1.92 to 2.00. The thermal diffusivities of these samples were measured at temperature up to 2150 K with the laser flash method. Thermal diffusivities of the near-stoichiometric samples obtained in the cooling process were greatly lower than those in the heating process unlike measurement below 1770 K. On the other hand, they were almost identical for the sample of 1.946 in O/M. It was also shown that thermal diffusivity decreased with the temperature but increased with the O/M.

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パーセンタイル:38.75

分野:Materials Science, Multidisciplinary

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