Grain Growth in Corundum Oxides-Doped Uranium Dioxide and Effects of Grain Growth to the Mechanical Properties of Uranium Dioxide Such as Elasticity Determined by Ultrasonic Methods

摘要

In this study, ex-ADU UO_2 powders are doped by small amounts of various corundum oxides such as Cr_2O_3, Ti_2O_3, Al_2O_3, V_2O_3. Doped UO_2 powders were pressed up 50% theoritical density (TD) and sintered under 90% Ar + 10% H_2 atmospheres at 1700 ℃ for duration of 4 hours. Pellet densities, longitudinal and shear wave ultrasonic velocities for each pellet were measured. Average grain diameter for each pellet was found by image analysis system. Elastic properties of pellets were determined from ultrasonic measurements.