ORNL-1771 - Oak Ridge National Laboratory
ORNL-1771 - Oak Ridge National Laboratory
ORNL-1771 - Oak Ridge National Laboratory
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PERIOD ENDING SEPTEMBER IO, 1954<br />
UNCLASSIFIED<br />
Fig. 6.10. Carburization of Incornel Exposed to Sodium with Carbon Additions for 100 hr at 150OOF.<br />
(a) inconel specimen before test. (6) Specimen tested in sodium plus 1 wt % carbon. (c) Specimen<br />
tested in sodium plus 10 wt % carbon. Specimens nickel plated to protect edges. Etched with glyceria<br />
regia. 250X.<br />
and a “tough skin,’’ which, it was hoped, would<br />
reduce penetration of various liquid mediums.<br />
An open Graph-i-tite crucible containing sodium<br />
and a sealed Graph-i-tite crucible containing NaF-<br />
ZrF,-UF, were tested at 1500°F for 100 hr in<br />
vacuum. The sodium completely penetrated the<br />
0.38-in.-thick wall of the crucible, as in the pre-<br />
vious test,’ and caused it to crack and crumble.<br />
The only macroscopically visible sign of attack on<br />
the crucible that contained the fluoride mixture was<br />
that the inner surface had a higher gloss (Fig. 6.11)<br />
after exposure, Metallographic examination of<br />
sections of the crucible indicated irregular pene-<br />
tration from 0 to 5 mils deep. No attempt has been<br />
made to determine whether reaction products ac-<br />
companied the penetration. This attack may be<br />
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