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ANP PROJECT QUARTERLY PROGRESS REPORT
MATERIAL
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a
Fig. 11.9. Type 316 stainless steel from Spinner Test with sodium at 816OC
for 100 hr at a Speed of 400 ft/min. 250X.
Inconel
Type 316 stainless steel
Type 347 stainless steel
Type 446 stainless steel
TIME OF
TEST (hr)
72
100
Ceramic Materials in Sodium. A
series of static corrosion tests of
various ceramic materials received
from the Ceramic laboratory has been
run in sodium at 816°C for 100 hr in
Inconel tubing. The results are
tabulated in Table 11.11 for the
materials that did not disintegrate
during test. Only two of the specimens
were intact after testing (A1,0, and
146
74
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METALLOGRAPHIC NOTFS
Surface layer of 0.5 mil with 0.5 mil of inter-
granular voids beneath
Intergranular attack, 1 to 2 mils deep on lead-
ing edge and 0.5 to 1 mil deep on trailing
edge
Intergranular attack, to 2 mils
Slight intergranular attack, less than 0.5 mil
Spinel). It is possible that if the
specimens that broke up during testing
had been thicker (specimens were
approximately 0,020 in, thick), some
of them would have remained intact.
The specimens that disintegrated into
fine powder during the testing included
porcelain (A1-576), mica, titanium
dioxide (A1-192), SiO,, barium titanate
(Al-T-106), A1,0, (single crystal ), lead
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