Abstract
Sintered uranium dioxide specimens containing soluble additions of CaO, Y 2O 3, ZrO 2 or insoluble additions of SiO 2 were subjected to creep-in-bending tests at temperatures from 1200–1450 °C in a dry hydrogen atmosphere. The soluble additions decreased and SiO 2 additions increased the plasticity of UO 2. Activation energies for steady state creep were determined. Grain boundary sliding and migration occurred during creep of all these materials. Additions of CaO, Y 2O 3 and SiO 2 increased the tendency towards formation of intercrystalline cracks during creep of UO 2.
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