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Effect of TiO₂ on Sintering Behavior of Mixed UO₂ and U₃O₈ Powder Compacts

Kun Woo Song, Keon Sik Kim, Ki Won Kang, Young‐Min Kim, Jae Ho Yang, Youn Ho Jung

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Abstract

The effect of TiO on the sintering behavior of mixed UO-UO Powder compacts has been investigated using the UO powder made tv oxidation of defective UO pellets. Without TiO, UO pellet density is inversely proportional to UO content and is below 94 %TD in the UO range above 15 wt%. Using more than 0.1 wt % TiO, however, the density decreases slightly with UO content and thus is higher than about 94% TD in the whole range of UO content. The grain sizes of UO pellets with more than 0.1 wt % TiOare larger than about 30. Therefore, the UO Powder can be reused without any restriction on its amount in UO pellet fabrication by sintering the mixed UO-UO compact with the aid of TiO. Mechanisms for densification and grain growth are proposed and discussed, based on a dilatometry study and an examination of microstructure. microstructure.

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The effect of TiO on the sintering behavior of mixed UO-UO Powder compacts has been investigated using the UO powder made tv oxidation of defective UO pellets. Without TiO, UO pellet density is inversely proportional to UO content and is below 94 %TD in the UO range above 15 wt%. Using more than 0.1 wt % TiO, however, the density decreases slightly with UO content and thus is higher than about 94% TD in the whole range of UO content. The grain sizes of UO pellets with more than 0.1 wt % TiOare larger than about 30. Therefore, the UO Powder can be reused without any restriction on its amount in UO pellet fabrication by sintering the mixed UO-UO compact with the aid of TiO. Mechanisms for densification and grain growth are proposed and discussed, based on a dilatometry study and an examination of microstructure. microstructure.

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Available abstract

The effect of TiO on the sintering behavior of mixed UO-UO Powder compacts has been investigated using the UO powder made tv oxidation of defective UO pellets. Without TiO, UO pellet density is inversely proportional to UO content and is below 94 %TD in the UO range above 15 wt%. Using more than 0.1 wt % TiO, however, the density decreases slightly with UO content and thus is higher than about 94% TD in the whole range of UO content. The grain sizes of UO pellets with more than 0.1 wt % TiOare larger than about 30. Therefore, the UO Powder can be reused without any restriction on its amount in UO pellet fabrication by sintering the mixed UO-UO compact with the aid of TiO. Mechanisms for densification and grain growth are proposed and discussed, based on a dilatometry study and an examination of microstructure. microstructure.

Key concepts: Pellets, Sintering, Microstructure, Materials science, Pellet, Fabrication, Grain growth, Grain size

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Effect of TiO₂ on Sintering Behavior of Mixed UO₂ and U₃O₈ Powder Compacts — Research Paper | ScholarLens