EXPLOSIVE NATURE OF URANIUM-BASE NIOBIUM ALLOYS AFTER IMMERSION IN NITRIC ACID.
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Abstract
The explosive behavior of uranium-base niobium alloys after immersion in nitric acid is characterized.The explosive behavior is related to a finely divided, two-phase microstructure, and to a high carbon content.In the first case, the nitric acid selectively attacks the alpha-uranium phase leaving behind a finely divided niobium-rich gamma phase which can oxidize with explosive violence.In the second case, niobium carbide inclusions accumulate at the surface and are likewise subject to rapid oxidation.The most violent explosions occur with slow-cooled, slab-cast, high-carbon alloys having a casting scale of UO and UO, .Nitric acid dissolves the UO and UO, casting scale and leaves behind a reactive surface layer of finely divided y-U, Nb-, C, NbC, and UO2(NO3),.6H20. When this wet or dry layer is sparked or struck, a violent decomposition occurs which rapidly produces large quantities of gases and heat, and leaves behind a residue of UO, on the surface of the metal.
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