Abstract
The effects of electric field and neutron irradiation on alumina insulators at elevated temperatures were examined. Neutron irradiation has been demonstrated to result in anisotropic growth of individual alumina crystals leading to the generation of internal stress in polycrystalline alumina. This phenomenon was modeled using a stress compliance method based on the ANSYS finite element code. The effect of irradiation conditions and operating temperature were examined. Additional relaxation due to long term creep and effect of irradiation enhanced creep were also included. Stress induced failure was predicted using Griffith's fracture theory. The electrotransport effect of alumina was determined based on the preferential migration of the aluminum and the oxygen ions. The driving force for the separation of the species was electrostatic in nature. The preferential diffusion of the ions coupled with the rapid aluminum migration resulted in the formation of oxygen bubbles at the anode in accord with experimental observation.
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