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AbstractAbstract
[en] The interrelation between the behaviour of isolated microspheres in compression tests and the microstructure of sintered pellets obtained with these microspheres, was investigated. Various batches of (Th, 5 w/o U)O2 microspheres were produced applying the so-called gel process. The production parameters were diversified both as to the composition and to the heat treatments. The resulting products underwent compression tests in an universal tension and compression machine as single microspheres and, as bulk material, were compacted and sintered. The results of the compression tests revealed the existence of two distinct classes of fragmentation behaviour. Each of these classes causes a distinct behaviour during the pelletization, too, resulting in fuel pellets with quite different microstructures. It was evidenced that there is a relationship between these differences in the microstructure and the behaviour of the single microspheres in the compression test. (Author)
[pt]
Relata-se a interrelacao entre o comportamento de microesferas isoladas em ensaios de compressao e a microestrutura de pastilhas sinterizadas com elas obtidas. Produziu-se diversas bateladas de microesferas de (Th, 5 w/o U)O2 pelo processo gel sob parametros diversificados tanto quanto a composicao quanto aos tratamentos termicos. As microesferas obtidas foram pesquisadas tanto isoladamente em ensaios de compressao quanto em conjunto em ensaios de peletizacao. Os resultados dos ensaios de compressao revelaram duas classes distintas de comportamento quanto a fragmentacao. Cada uma dessas classes levou a um comportamento tambem distinto e bem caracteristico na peletizacao, com obtencao de dois tipos bem diferentes de microestruturas nas pastilhas, diferencas estas claramente ligadas a cada classe de comportamento das microesferas sob compressao. (Autor)Original Title
Comportamento de microesferas de (Th, U)O2 em ensaios de compressao e peletizacao
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Source
Dec 1982; 98 p; Tese (M.Sc.).
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Miscellaneous
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Thesis/Dissertation
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