ORNL-1771 - Oak Ridge National Laboratory
ORNL-1771 - Oak Ridge National Laboratory ORNL-1771 - Oak Ridge National Laboratory
PERlOD ENDING SEPTEMBER JO, 1954 Fig. 6.12. Carburization of Type 304 Stainless Steel Exposed to Graph-i-tite (a) and to C-18 Graphite (b) in Sodium for 100 hr at lSOO°F in Vacuum. (a) Depth of carburization was 118 mils (concentrated) to 32 mils (traceable). (b) Depth of carburization was 16 mils (concentrated) to 32 mils (traceable). Etched with glyceria regia. Fig. 6.13, Carburization of Type 304 Stainless Steel Exposed to Graph-i-tite (a) and to C-118 Graphite (b) in Sodium for 500 hr at 1500OF in Vacuum. Depth of carburization was 40 mils (concentrated) to 49+ mils (traceable through the tube wall). Depth of carburization was 33 mils (concentrated) to 49+ mils (traceable through the tube wall). (a) (6) Etched with gllyceria regia. f . ' 93
ANP QUARTERLY PROGRESS REPORT Ceramics in Various Mediums Static corrosion screening tests of three ceramic oxides and one carbide (A1203, MgAI,O,, calcium- stabilized ZrO,, and sic) were mode in a vacuum atmosphere at l5OO0F for 100 hr in each of four med i urns: sod ium, NaF-ZrF,-UF, (53.5-40-6.5 molk %), lithium, and lead, A fourth ceramic oxide was tested under the same conditions in sodium and in NaF-ZrF,-UF, (53.5-40-6.5 mole %). The A120, and MgAI,O, test pieces were cut froin single, synthesized crystals; the Mg0 test pieces were cleaved from a single, synthesized crystal. The nominal dimensions of the test pieces and the re- 94 sults of the tests are given in Table 6.5. Powder x-ray examinatians were made of the specimens that were the least corrosion resistant in each medium, and the results are summarized in Table 6.6. The Sic specimens were, in general, the most resistant to corrosion, and the AI,O, specimens were the next most resistant. These single-run screening tests are qualitative, and the results should be used with caution. Larger specimens are to be tested so that more accurate data can be obtained and metallographic examinations and chemical analyses can be made. TABLE 6.5. SUMMARY OF STATIC TESTS OF CERAMICS IN VARIOUS ~ ~ AT 1500°F ~ FOR ~ 100 hr I ~ M ~ Thickness Material Tested Change (a) A1203n - 0.5 Sicb -0.9 M~AI~O," 0.0 Zr02 (GO' stabilized) +8.6 MgOC -0.5 A1203 Zr02 (CaO stabilized) Mg 0 A1203 Weight Change ( % Tested in Sodium Re marks -0.9 Specimen changed from a colorless transparent state to a white semitransparent state; a small crack appeared an an edge Specimen essentially unaltered; brighter and cleaner; small part of disk edge broken off Originally colorless transparent specimen almost com- pletely changed to a black state; chipped slightly on one edge Specimen changed from light buff to blue-black; edge chipped -0.1 Specimen unaltered except for color change from color- less to light blue-gray Tested in NaF-ZrF4-UF4 (53.5-40-6.5 mole W) -3 1 Specimen broken and covered with fluoride mixture; brown-red interface present between the fluoride mix- ture and the specimen - 1.8 Specimen broken; recovered pieces appeared to be un- attacked Recovered portion of specimen (more than one-half) covered with fluoride mixture and apparently com- pletely altered No visible trace of specimen found No visible trace of specimen found Test.ed in Lithium No visible trace of specimen found
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PERlOD ENDING SEPTEMBER JO, 1954<br />
Fig. 6.12. Carburization of Type 304 Stainless Steel Exposed to Graph-i-tite (a) and to C-18 Graphite<br />
(b) in Sodium for 100 hr at lSOO°F in Vacuum. (a) Depth of carburization was 118 mils (concentrated) to<br />
32 mils (traceable). (b) Depth of carburization was 16 mils (concentrated) to 32 mils (traceable). Etched<br />
with glyceria regia.<br />
Fig. 6.13, Carburization of Type 304 Stainless Steel Exposed to Graph-i-tite (a) and to C-118 Graphite<br />
(b) in Sodium for 500 hr at 1500OF in Vacuum. Depth of carburization was 40 mils (concentrated)<br />
to 49+ mils (traceable through the tube wall). Depth of carburization was 33 mils (concentrated)<br />
to 49+ mils (traceable through the tube wall).<br />
(a)<br />
(6)<br />
Etched with gllyceria regia.<br />
f<br />
.<br />
'<br />
93
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