Abstract
The influence of the properties and the treatments of UO 2 and ThO 2 powders on the preparation of a double pellet composed by UO 2 inner core and ThO 2 outer hollow cylinder was studied. Although a simultaneous pressing-sintering process is preferable due to its relative simplicity and quickness, good (uncracked) double pellets were manufactured only by a two-step separate UO 2 and ThO 2 pressing and sintering. Different shrinkage kinetics of the two components are responsible for this behaviour.
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