ORNL-2106 - the Molten Salt Energy Technologies Web Site
ORNL-2106 - the Molten Salt Energy Technologies Web Site ORNL-2106 - the Molten Salt Energy Technologies Web Site
ANP PROJECT PROGRESS REPORT that the gray-black color extended throughout the negligible quantities of rare earths, chromium, specimens. This is evidence that the sodium iron, and nickel, which also supports the con- completely penetrated the specimens, probably clusion that there was negligible attack on either along the pore spaces. the rare-earth oxides or the Inconel capsules. Powder x-ruy diffraction patterns of the untested The major losses of rare-earth oxides were cal- and tested pieces of Sm,O, and the two Lindsay culated on the basis of the chemical analyses, Mix specimens did not reveal any reaction products. and the results are summarized in Table 3.2.7. Chemical analyses of the sodium baths indicated In comparing the results from the 500- and 1000-hr Fig. 3.2.19. Specimens of AIS1 1043 Steel After Exposure to Sodium in a Type 304 ELC Stainless Steel Container at 1830°F for 400 hr. (a) 200X. Reduced 13%. (b) 500X. Reduced 13%. Etched with 2% nital. Sm203 TABLE 3.27. RESULTS OF TESTS OF VARIOUS RARE-EARTH OXIDES EXPOSED TO STATIC SODIUM IN INCONEL CONTAINERS 5.88 23.2 1500 1000 2.9 2.6 0.18 0.13 5.8 Lindsay Mix** 6.58 1500 500 2.9 1.08 0.76 0.41 5.1 6.58 1500 1000 4.8 1.08 0.82 0.67 7.4 3.53 53.5 1300 100 13.2 5.90 2.16 17.4 38.7 *These values were calculated on the basis of the rare earths found by chemical analyses in the sodium from each test. 156 **Composition: 63.8 wt 96 Sm203, 26.3 wt X Gd203, balance primarily other rare-earth oxides. W t f bd
tests of the Lindsay Mix specimens, no significant differences were found. Metallographic polishing and examination of the rare-earth oxide specimens before and after ex- posure to the sodium indicated that the specimens may have been slightly weakened by the tests, but there was no microscopically visible corrosion, as shown in Fig. 3.2.20. Metallographic examination of the lnconel capsules revealed slight surface roughening to a depth of less than 0.5 mil in spots on the inner surfaces that contacted the liquid sodium and the Lindsay Mix specimens. There was no surface roughening and no attack of the Inconel capsule that contained the Sm 0 ? 3 specimen and sodium. Spectrographic examinations of the inner surfaces of the three capsules did not reveal any rare earths. The corrosion resistance to molten sodium shown by the Lindsay Mix dith a density of 6.58 g/cm3 prompted further tests that were designed to approximate more closely the expected operating conditions and for which a Lindsay Mix body with the proposed density and configuration was used. PERIOD ENDING JUNE 10, 1956 The purposes of these tests were to determine the relationship of the apparent porosity of the Lindsay Mix body for water to that for molten sodium and to study the corrosion resistance of the body and lnconel when separated by only a small thickness (approximately 0.05 in.) of sodium. A hollow cylinder of porous Lindsay Mix body was used that was nominally 0.9 in. OD, 0.5 in. ID, and 1 in. long, with a density of 3.53 g/cm3 and an apparent porosity to water of 53.5%. This body had an apparent porosity of 52% to sodium after exposure to static sodium for 100 hr at 130OoF in an evacuated lnconel capsule. To determine the apparent porosity of the body to sodium, the sodium was allowed to cool and solidify around the body at the end of the 100-hr test period. The test capsule was then opeiied in a helium atmosphere, the excess sodium was removed from the surfaces of the body with plastic scrapers, and the body and its absorbed sodium were weighed. The absorbed sodium was then removed by vacuum distillation, and the body was again weighed. The apparent porosity of the body Fig. 3.2.20. Rare-Earth Oxide Specimens (63.8 wt X Sm20,-26.3 wt X Gd2O3-BaJance Primarily Other Rare-Earth Oxides) (a) in As-received Condition and (b) After Exposure to Static Sodium in an lnconel Container for 500 hr at 1500OF. Unetched. SOOX. Reduced 5.5%. 157
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ANP PROJECT PROGRESS REPORT<br />
that <strong>the</strong> gray-black color extended throughout <strong>the</strong> negligible quantities of rare earths, chromium,<br />
specimens. This is evidence that <strong>the</strong> sodium iron, and nickel, which also supports <strong>the</strong> con-<br />
completely penetrated <strong>the</strong> specimens, probably clusion that <strong>the</strong>re was negligible attack on ei<strong>the</strong>r<br />
along <strong>the</strong> pore spaces. <strong>the</strong> rare-earth oxides or <strong>the</strong> Inconel capsules.<br />
Powder x-ruy diffraction patterns of <strong>the</strong> untested The major losses of rare-earth oxides were cal-<br />
and tested pieces of Sm,O, and <strong>the</strong> two Lindsay culated on <strong>the</strong> basis of <strong>the</strong> chemical analyses,<br />
Mix specimens did not reveal any reaction products. and <strong>the</strong> results are summarized in Table 3.2.7.<br />
Chemical analyses of <strong>the</strong> sodium baths indicated In comparing <strong>the</strong> results from <strong>the</strong> 500- and 1000-hr<br />
Fig. 3.2.19. Specimens of AIS1 1043 Steel After Exposure to Sodium in a Type 304 ELC Stainless Steel<br />
Container at 1830°F for 400 hr. (a) 200X. Reduced 13%. (b) 500X. Reduced 13%. Etched with 2% nital.<br />
Sm203<br />
TABLE 3.27. RESULTS OF TESTS OF VARIOUS RARE-EARTH OXIDES EXPOSED TO STATIC<br />
SODIUM IN INCONEL CONTAINERS<br />
5.88 23.2 1500 1000 2.9 2.6 0.18 0.13 5.8<br />
Lindsay Mix** 6.58 1500 500 2.9 1.08 0.76 0.41 5.1<br />
6.58 1500 1000 4.8 1.08 0.82 0.67 7.4<br />
3.53 53.5 1300 100 13.2 5.90 2.16 17.4 38.7<br />
*These values were calculated on <strong>the</strong> basis of <strong>the</strong> rare earths found by chemical analyses in <strong>the</strong> sodium from each<br />
test.<br />
156<br />
**Composition: 63.8 wt 96 Sm203, 26.3 wt X Gd203, balance primarily o<strong>the</strong>r rare-earth oxides.<br />
W<br />
t<br />
f<br />
bd
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