Sol-gel 공정을 이용한 UO2 kernel 제조에서 공정변수가 입자특성에 미치는 영향
Effects of Process Parameters on the Powder Characteristics of Uranium Oxide Kernel Prepared by Sol-gel Process
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In this study, we investigated the unit process parameters in spherical UO2 kernel preparation. Nearly perfect spherical UO3 microspheres were obtained from the 0.6M of U-concentration in the broth solution, and the microstructure of the UO2 kernel appeared the good results in the calcining, reducing, and sintering processes. For good sphericity, high density, suitable microstructure, and no-crack final UO2 microspheres, the temperature control range in calcination process was 300~450℃, and the microstructure, the pore structure, and the density of UO2 kernel could be controlled in this temperature range. Also, the concentration changes of the ageing solution in aging step were not effective factor in the gelation of the liquid droplets, but the temperature change of the ageing solution was very sensitive for the final ADU gel particles.
Abstract
In this study, we investigated the unit process parameters in spherical UO2 kernel preparation. Nearly perfect spherical UO3 microspheres were obtained from the 0.6M of U-concentration in the broth solution, and the microstructure of the UO2 kernel appeared the good results in the calcining, reducing, and sintering processes. For good sphericity, high density, suitable microstructure, and no-crack final UO2 microspheres, the temperature control range in calcination process was 300~450℃, and the microstructure, the pore structure, and the density of UO2 kernel could be controlled in this temperature range. Also, the concentration changes of the ageing solution in aging step were not effective factor in the gelation of the liquid droplets, but the temperature change of the ageing solution was very sensitive for the final ADU gel particles.
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