Role of Crystallinity in the Sintering of Urania Powders

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Abstract
The crystallinity in UO2 powders prepared by the ADU route at different calcination temperatures (600°-1600°C) and its influence on their sintering behaviour (sintering temperature 1000°-1600°C) in hydrogen were studied by X-ray difiraction techniques. Powder patterns were made for the loose powders and back reflection for the sintered pellets. It was noticed that higher the calcination temperature, the greater was the degree of crystallinity developed in the powders and poorer was their sinterability. The crystallinity of the sintered pellets was mainly dependent on the sintering temperature and crystallinity of the original powder and is not directly related to the sintered density. By sintering pellets of poorly crystalline powders at low temperatures (about 1200°C) sintered pellets of near theoretical density but with poorly developed crystallinity could be obtained.

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