Development and Characterization of Cermet Forms for Radioactive Waste
Cermets designed to isolate high level wastes in a solid form are a composite consisting of various ceramic phase particles uniformly dispersed in and microencapsulated by an iron-nickel base alloy matrix. The metal matrix provides this waste form with many advantageous features including excellent thermal conductivity and mechanical strength. These cermets are formed by first dissolving the waste in molten urea, precipitating and calcining all the constituents, compacting the calcine, and sintering and reducing to form the final product. The exact formulation of cermets through additions to the waste is designed to fix most of the fission products in stable leach-resistant ceramic phases which are subsequently microencapsulated by an alloy matrix. The alloy matrix, which is derived primarily from the waste itself and includes the reducible fission and activation products from the waste, can be compositionally adjusted through additions to optimize its corrosion resistance under conditions existing in various disposal environments.
KeywordsAlloy Matrix Liquid Phase Sinter Conventional Sinter Waste Form High Level Waste
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