Abstract
Isotopically depleted zinc oxide ceramics are used to reduce radiation build-up in BWR s (Boiling Water Reactors) by incorporating zinc ions in the corrosion film of stainless steel piping in the cooling system of the nuclear reactor. Volatile precursors of zinc oxide suitable for gas centrifugation were converted into zinc oxide powder by several methods; namely, 1) direct oxide conversion, 2) carbonate conversion and 3) sol-gel conversion. These powders were characterized as regarding particle size distribution, specific surface area and thermal properties (TG, DTA and DSC). The analysis of trace contaminants was carried out using Atomic Emission Spectroscopy. The morphology of the powders was observed using scanning electron microscopy and their sinterability was evaluated using a high temperature dilatometer. Discs were pressed using a mechanical double action press and sintered in an air atmosphere. The ceramic microstructure was studied by scanning electron microscopy. The objective of this paper is to present the key materials characteristics of the depleted zinc oxide powders and the respective ceramic bodies made thereof.
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