The sintering blockage mechanism in the UO2-Gd2O3 system
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2010
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EUROPEAN NUCLEAR CONFERENCE 2010
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Resumo
The incorporation of gadolinium directly into nuclear power reactor fuel is important
from the point of reactivity compensation and adjustment of power distribution
enabling thus longer fuel cycles and optimized fuel utilization. The incorporation of
Gd2O3 powder directly into the UO2 powder by dry mechanical blending is the most
attractive process because of its simplicity. Nevertheless, processing by this
method leads to difficulties while obtaining sintered pellets with the minimum
required density. This is due to blockages during the sintering process. There is
little information in published literature about the possible mechanism for this
blockage and this is restricted to the hypothesis based on formation of a low
diffusivity Gd rich (U,Gd)O2 phase. The objective of this investigation has been to
study the blockage mechanism in this system during the sintering process,
contributing thus, to clarify the cause for the blockage. Experimentally it has been
shown that the blocking mechanism is based on pore formation because of the
Kirkendall effect, instead the formation of low diffusivity phases. The formation of a
solid solution during the intermediate stage of sintering leads to formation of large
pores, which are difficult to remove in the final stage of sintering. The phenomenon
is better characterized as a concurrence between formation and elimination of
pores during sintering than as a sintering blockage.
Como referenciar
DURAZZO, M.; RIELLA, H.G. The sintering blockage mechanism in the UO2-Gd2O3 system. In: EUROPEAN NUCLEAR CONFERENCE 2010, May 30 - June 02, 2010, Barcelona, Espanha. Proceedings... p. 10-13. Disponível em: http://repositorio.ipen.br/handle/123456789/17804. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.