Thermal Convection Loop Tests of Nb-1% Zr Alloy in Lithium at 1200 and 1300°C
作者:
SessionsC. E.,
DeVanJ. H.,
期刊:
Nuclear Applications and Technology
(Taylor Available online 1970)
卷期:
Volume 9,
issue 2
页码: 250-259
ISSN:0550-3043
年代: 1970
DOI:10.13182/NT70-A28814
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractThis paper describes the effect of temperature on the mass transfer of niobium alloys in lithium as determined in thermal convection loop tests to 1300°C. All loops were operated for 3000 h in an ultrahigh vacuum environment; A consistent finding in these tests was the preferential movement of zirconium and nitrogen between heated and cooled regions, which in 1200°C tests accounted for most of the observed weight changes. At 1300°C, transport of niobium was also reflected in the weight changes, and crystalline deposits of Nb(C,N) were found on hot-leg specimens. Examination of Nb-1% Zr specimens using an electron microprobe indicated the hot-leg surfaces to be depleted of zirconium to depths of 0.002 and 0.007 in. in 1200 and 1300°C tests, respectively. The results of calculations of the diffusivity of zirconium in niobium based on these data agree well with values predicted from extrapolation of higher temperature data.
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