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- W56981750 abstract "The kinetics of grain growth in ThO/sub 2/-base sintered compacts were investigated to determine the cause of a nonuniform microstructural cross section. It was concluded that trace impurities which inhibit continuous grain growth at the pellet interior were removed by vaporization at the pellet exterior. This resulted in relatively normal grain growth at the pellet surface and discontinuous grain growth at the pellet interior. Calcining the starting ThO/sub 2/ powder to a slightly higher temperature removed inhibiting impurities but also decreased the driving force for grain growth by reducing the surface area of the powder. Mixing high and low temperature calcined ThO/sub 2/ resulted in improved grain growth. Increased oxygen partial pressure and temperature during sintering increased grain boundary mobility in spite of the inhibiting impurity. The specific inhibiting impurity was not isolated during this investigation." @default.
- W56981750 created "2016-06-24" @default.
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- W56981750 date "1976-01-01" @default.
- W56981750 modified "2023-09-27" @default.
- W56981750 title "Grain growth in thoria and thoria-base fuel pellets (LWBR development program)" @default.
- W56981750 doi "https://doi.org/10.2172/7296702" @default.
- W56981750 hasPublicationYear "1976" @default.
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