GRAIN GROWTH IN SINTERED URANIUM DIOXIDE. II. COLUMNAR GRAIN GROWTH

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Journal of the American Ceramic Society (U.S.)

DOI:https://doi.org/10.1111/j.1151-2916.1962.tb11027.x· OSTI ID:4820160

MacEwan, J R; Lawson, V B

Evidence is presented which shows that columnar grains can be induced to grow in high-density sintered uranium dioxide specimens by applying a steep temperature gradient at temperatures above 1700 f C but below the melting point of 2800 f C. Columnar growth apparently is a result of the migration of large transverse voids, whose individual widths define the cross sections of the grains, up a temperature gradient by a sublimation process. The grains grown by this process have a <111> preferred orientation along their columnar axis. A consequence of such void migration in operating fuel elements containing solid UO/sub 2/ pellets is the formation of a central void bounded by a region of oxide exhibiting columnar growth. (auth)

• Research Organization: Atomic Energy of Canada Ltd., Chalk River, Ont.
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-006745
• OSTI ID: 4820160
• Journal Information: Journal of the American Ceramic Society (U.S.), Journal Name: Journal of the American Ceramic Society (U.S.) Vol. Vol: 45; ISSN JACTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANISOTROPY
CONFIGURATION
DIFFUSION
EVAPORATION
FUEL ELEMENTS
GRAIN SIZE
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
SINTERED MATERIALS
SINTERING
SUBLIMATION
TEMPERATURE
URANIUM DIOXIDE