Micro-Hardness of Non-Irradiated Uranium Dioxide

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  • 未照射二酸化ウランのミクロ硬さ
  • ミ ショウシャ 2サンカ ウラン ノ ミクロ カタサ

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In order to obtain the optimum conditions for micro-hardness measurements of sintered UO2, two kinds of hardness tests (Vickers and Knoop) were examined with non-irradiated UO2 of 2.5 and 5μm in grain size. The hardness values were obtained as a function of the applied load in the load range of 25-1, 000g.<BR>In the Vickers test, cracks were generated around the periphery of an indentation even at lower load of 50g, which means the Vickers hardness is not suitable for UO2 specimens.<BR>In the Knoop test, three stages of load dependence were observed for sintered pellet as well as for a single crystal by Bates. Load dependence of Knoop hardness and crack formation were discussed. In the range of applied load around 70-100g there were plateau region where hardness values were nearly unchanged and did not contain any cracks in the indentation. The plateau region represents a hardness of a specimen. From a comparison between the hardness values of 2.5μm and those of 5μm UO2, it was approved that the degree of sintering controls the hardness in the plateau region.

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