Ammonia as a sintering aid for UO/sub 2/

Journal Article · Mon Jan 31 23:00:00 EST 1977 · Am. Ceram. Soc. Bull.; (United States)

OSTI ID:7212216

Radford, K C; Pope, J M

Ammonia is a sintering aid for UO/sub 2/ pellets. The enhancement in densification using NH/sub 3/ atmospheres includes a reduction in sintering temperatures and a substantial increase in grain size. A redistribution and increase in size of the porosity occurs. Calcining UO/sub 2/ precursors (such as ammonium diuranate) in NH/sub 3/ results in a more active powder which produces a larger grain size in sintered structures than does calcining in hydrogen. Small additions of ammonium salts also result in similar enhancements in grain size.

• Research Organization: Westinghouse Research Labs., Pittsburgh
• OSTI ID: 7212216
• Journal Information: Am. Ceram. Soc. Bull.; (United States), Journal Name: Am. Ceram. Soc. Bull.; (United States) Vol. 56:2; ISSN ACSBA
• Country of Publication: United States
• Language: English

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360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ACTINIDE COMPOUNDS
AMMONIA
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
FABRICATION
GRAIN SIZE
HYDRIDES
HYDROGEN COMPOUNDS
MICROSTRUCTURE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
POROSITY
REDUCTION
SINTERING
SIZE
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES