Grain Growth in Sintered Uranium Dioxide: II, Columnar Grain Growth
作者:
J. R. MacEWAN,
V. B. LAWSON,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1962)
卷期:
Volume 45,
issue 1
页码: 42-46
ISSN:0002-7820
年代: 1962
DOI:10.1111/j.1151-2916.1962.tb11027.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
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°C but below the melting point of 2800°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 UO2pellets is the formation of a central void bounded by a region of oxide exhibiting columnar gro
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