ORNL-1816 - the Molten Salt Energy Technologies Web Site

ANP QUARTERLY PROGRESS REPORT
Fig. 6.11. (a) As-Received ZrC.
150OOF for 100 hr. Unetched. 500X.
loop sectionedafter a test may be seen in Fig.6.12.
The hot legs of the loop were constructed of 0.5-
in,-OD, 49-mi I-wall tubing, and the condenser
section was of 0.25-in.-OD, 35-mil-wall tubing.
The loop was loaded with 8 cm3 (approximately
12 9) of vacuum-distilled rubidium, which filled
it to the level indicated in Fig. 6.12. A vapor-
phase heat transfer system of this type will elimi-
nate mass transfer in the vapor regions. However,
the temperature gradients present in the liquid
region might conceivably cause crystal deposition.
The maximum attack occurred in the hot leg of the
loopto adepth of lmil,as may be seen in Fig.6.13.
The attack was intergranular, and one grain ap-
peared to be ready to fall from the wall.
A schematic diagram of the apparatus presently
used to distill rubidium is shown in Fig. 6.14.
r, 3 lb of rubidium has been purified, Since
the addition of 8% sodium will reduce the melting
point of rubidium to approximately 2OoF, tentative
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
I
0
5
(b) ZrC After Exposure to NaF-ZrF,-UF, (53.5-40-6.5 mole %) at
plans call for an investigation of the corrosion
properties of the sodium-rubidium eutectic.
FUNDAMENTAL CORROSION RESEARCH
G. P. Smith
Meta I I urgy Di vi sion
Mass Transfer in Liquid Lead
J. V. Cathcart
Metallurgy Division
The results of previous tests3 indicated that
a1 loys in which intermetallic compound formation
was possible showed a marked increase in re-
sistance to mass transfer in liquid lead as com-
pared with the mass transfer obtained with their
pure components. Comparable behavior was not
observed in alloys such as Nichrome V in which
'J. V. Cathcart, ANP Quar. Prog. Rep. Sept. 10, 1954,
ORNL-1771, p 100.