ORNL-1771 - Oak Ridge National Laboratory
ORNL-1771 - Oak Ridge National Laboratory ORNL-1771 - Oak Ridge National Laboratory
PERIOD ENDING SEPTEMBER IO, 1954 0,004 I_ : 0 6, 0.002 I_ 0.003 - X u z- 3.004 - Fig. 6.8. lnconel Exposed to Static Rubidium for '100 hr ot 1650OF. Note decarburization in attacked area. Specimen nickel plated after test to protect edge. Etched with glyceria regia. cent sodium and some oxygen contamination. Ad- ditional static tests are under way with triple- distilled rubidium, and an Inconel thermal convection loop is being operated with boiling rubidium, Fig. 6.9. This loop has now operated for several hundred hours without difficulty. Carburization of Inconel by Sodium It is well known that sodium, in addition to de- carburizing metals, can, in some cases, carburize them if the carbon concentration in the sodium is sufficiently high. Therefore, an attempt is being made to determine whether small additions of carbon would prevent decarburization of lnconel specimens during long-time creep tests in contact with sodium at elevated temperatures. A-nickel containers are being used for static tests so that the ratio of lnconel surface area to sodium volume! will be small. The maximum solubility of carbon in nickel at 1500°F is approximately 0.1%, and therefore the carburization of the nickel Containers in these tests is very slight. The A-nickel used for the containers was found by analysis to contain only 0.05% carbon. The ratio of the lnconel surface to the sodium volume in the tests performed to date was 0.76. The lnconel specimens used were 0.049-in. sheet reduced to 0.015 in. by cold rolling, and they were annealed for 2 hr at 1650°F. The carbon additions (1, 5, and 10 wt %) were made to the sodium in the form of small lumps of reactor-grade graphite. The nickel containers were loaded with the ln- conet specimens, the graphite, and the sodium in a dry box in o purified helium atmosphere and sealed under vacuum, As shown in Table 6.4 and Fig. 6.10, all the specimens were very heavily carburized and extremely brittle after exposure for 100 hr at 1500'F. Also, they were partly covered with a 89
ANP QUARTERLY PROGRESS REPORi Fig. 6.9. Inconel Thermal-convection Loop far Circulating Bviling Rwbidium. green surface film that was identified by x-ray analysis to be Cr,O,. The oxygen source for forma- tion of this film was, at first, thought to be the graphite which had not been degassed prior to the tests; however, a Cr,C, film was later found in other tests with degassed graphite and standard tests with no graphite addition. Therefore prepa- rations are being made for obtaining oxygen-free sodium for use in these tests. 'E. E. Hoffman et a[., ANP Quai. Prog. Rep. Junp 10, 1954, ORNL-1729, p 70. 90 Special Tar-Impregnated and Fired Graphite A special tar-impregnated and fired graphite, known commercially as Graph-i-tite, has been tested for corrosion resistance to sodium and NaF-ZrF,- UF, (53.5-40-6.5 mole %). Also, a comparison was made of the carburization of an austenitic stainless steel by contact with Graph-i-tite and with C-18 graphite (reactor grade). The Graph-i-tite was fabricated, as described previously,' by tar-impreg- noting and firing graphite 16 times. The repeated tar impregnations and firings produce a high density
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ANP QUARTERLY PROGRESS REPORi<br />
Fig. 6.9. Inconel Thermal-convection Loop far Circulating Bviling Rwbidium.<br />
green surface film that was identified by x-ray<br />
analysis to be Cr,O,. The oxygen source for forma-<br />
tion of this film was, at first, thought to be the<br />
graphite which had not been degassed prior to the<br />
tests; however, a Cr,C, film was later found in<br />
other tests with degassed graphite and standard<br />
tests with no graphite addition. Therefore prepa-<br />
rations are being made for obtaining oxygen-free<br />
sodium for use in these tests.<br />
'E. E. Hoffman et a[., ANP Quai. Prog. Rep. Junp 10,<br />
1954, <strong>ORNL</strong>-1729, p 70.<br />
90<br />
Special Tar-Impregnated and Fired Graphite<br />
A special tar-impregnated and fired graphite,<br />
known commercially as Graph-i-tite, has been tested<br />
for corrosion resistance to sodium and NaF-ZrF,-<br />
UF, (53.5-40-6.5 mole %). Also, a comparison was<br />
made of the carburization of an austenitic stainless<br />
steel by contact with Graph-i-tite and with C-18<br />
graphite (reactor grade). The Graph-i-tite was<br />
fabricated, as described previously,' by tar-impreg-<br />
noting and firing graphite 16 times. The repeated<br />
tar impregnations and firings produce a high density
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