VIBRATIONAL COMPACTION OF URANIUM DIOXIDE

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Abstract
Rough, angular particles of fused uranium dioxide of mesh size ranges defined by Tyler screen sizes the square root of two apart in diameter, will pack to densities between 58--65 per cent of theoretical in tubes close to onehalf inch internal diameter or smaller. Binary mixtures of 2 size ranges are capable of producing much higher A 3-size range of coarse, together with 5 micron powder, went to 87.8 per cent. Ternary mixtures are easily capable of 88 per cent, and quarternary mixtures greater than 90 per cent. Segregation can be controlled and minimized by the use of noise during feeding and slight restraint during sine wave cycling. Plastic deformation is involved in packing UO/sub 2/ since mixtures above 85 per cent are removed with diffdculty from their containing tubes. Powder stress is variable from lot to lot and constitutes an important variable, since the friability determines the best starting formula for a given final density. (auth)

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