ORNL-2106 - the Molten Salt Energy Technologies Web Site

PERIOD ENDING JUNE 10, 1956
NaK were 100 and 350 hr, and the exposures to fuel mixture for 500 hr showed that the concen-
the fuel mixture were of 100 and 500 hr duration. tration of boron was less than 1% from the surface
The results of the tests are presented in Table to a depth of 8 mils. The boron content then rose
3.2.2. Boron was found only in very small quan- sharply to its normal value (4%) and stayed there
tities in the areas depleted of the second phase for the remainder of the traverse. Samples of the
by exposure to NaK and to the fuel mixture. A depleted area, obtained by microdrilling, were
microspark traverse on the sample exposed to the analyzed and were found to contain 0.6% boron.
Fig. 3.2.2. Specimens of lnconel Joints Brazed with the 70% Ni-13% Ge-11% 04% Si Brazing Alloy
and Exposed for 500 hr to NaK at 1500°F in the Hot Leg of an lnconel Thermal-Convection Loop. These
two specimens, No. 2 and No. 6, illustrations (a) and (b), respectively, were the only samples examined
that did not have large cracks in the brazing alloy. Etched with 10% oxalic acid. 150X. Reduced 8%.
TABLE 3.22 RESULTS OF SEESAW CORROSION TESTS OF COAST METALS
BRAZING ALLOY No. 52 (89% Ni-5% Si-4% 84% Fe)
Weight Loss of Depth of Edge Depleted
Specimen of Second Phase
100 0.07 0.5
350 0.23 4
500 0.34 6
3
143