ORNL-1816 - the Molten Salt Energy Technologies Web Site

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ANP QUARTERLY PROGRESS REPORT
TABLE 6.8. SUMMARY OF STATIC TESTS OF CARBIDES AT 15OO0F FOR 100 hr
Average
Apparent Weight
Material Density D imen siona I Attack
3 Porosity Change*
Tested (g/cm ) Change* (mils)
(760)
(%Io)
( %)
Tested in Sodium
Remarks
B4C 2.51 3.5 -6.5 Specimen cracked and fell apart during test
Tic 4.81 1.3 + 0.3 0 0 No attack; particles bonded so well that it
was difficult to distinguish individual
particles in unetched specimen
ZrC 6.91 0.8 0 +0.1 0 No attack; particles well bonded
Cr3C2 6.59 2.2 0 -0.4 0 No attack; particles not well bonded
B4c
Tested in NaF-ZrF4-UF4 (53.5-40-6.5 mole %)
+0.1 -0.4 5 Unidentified phase on one side of
specimen that had a maximum thickness
of 14 mils
Ti C 0 +0.1 0 No attack; as-received and tested
specimens not bonded nor formed so well
as those tested in sodium
ZrC +0.3 Major portion of pore s
fluoride mixture
Cr3C2 +0.2 No attack
B4C
Tested in Lithium
- 12.2 Specimen expanded and crocked; original,
dark, semimetallic luster dulled
TIC 0 0 0 No attack; macroscopic color slightly
I i ghter
ZrC +0.2 -1.1 0 No attack
Cr3C2 +0.2 -1.2 0 No attack; small crack in middle of
specimen; metallic luster disappeared
*The average dimensional change (%) is the average of the width, height, and length changes, whereas the weight
change (%) represents a single value.
high-temperature corrosion of sodium, lithium, and material was corrosion tested in water at various
temperatures. Specimens of this material were
carefully cleaned just prior to testing to remove
86
.,*-Ts.;;r*===tw?%r.. -
*%.
has been pro-?
surface films, chiefly Li,N, which form on exposure
to air, A cleaned specimen was found to gain t
0.088 mg/cm2 after standing in the atmosphere for
hielding. i 6 hr. The weight losses of specimens tested at
:.
r