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a
*
in this apparatus was 10 fps, the bath temperature
was practically isothermal, The temperatures given
are the outside tube wall temperatures. The be-
ryllium distribution shown appears to be temperature
dependent; however, in other dynamic tests, this
was not so obvious. The outside and inside sur-
faces of a beryllium insert from the hot leg of an
lnconel thermal-convection loop are shown in Fig.
6.2. As in nearly all the other compatibility tests,
Test
PERIOD ENDING DECEMBER 70,7954
the heaviest attack was on the outside surface of
the insert. The attack was due to dissimilar metal
mass transfer between the beryllium and the lnconel
sleeve which surrounded it, The result clf direct
contact between lnconel and beryllium in a system
containing sodium at elevated temperatures may be
seen in Fig. 6.3. The Be-Ni intermetallic layer
which formed was approximately 20 mils thick and
was extremely hard and brittle, Tests are piresently
TABLE 6.4. RESULTS OF BERYLLIUM-SODIUM-INCONEL COMPATIBILITY TESTS
Concentration of
Test
Time
Temperature (OF) Be on
Tube
(pg/cm2)
Type (hr) Hot Zone Cold Zone Of lnconel
Metal I ographi c Notes
Whirligig 300 1100 Isothermal 5.3 to 7.9 Two dark deposits on lnconel which onalyzed high in
beryllium; layer on lnconel sleeve; beryllium insert
showed no attack on inside and 1 mil of attack on
outside surface
*See Fig. 6.1.
300 1200 Isothermal 0.05 No deposits on lnconel tube; 0.4-mil layer on lnconel
sleeve; beryllium insert had no attock on inside
surface and 1 mil of attack (voids) on outside
surface
300 1300 Isothermal 0.07 lnconel sleeve which enclosed beryllium insert had
1-mil layer on surfoce; beryllium insert hod no
attack on inside surface and subsurface voids to
a depth of 5 mils on outside surfoce
300 1400 Isothermal 39.6 to 127 Deposit of 2 to 3 mils on lnconel sleeve; beryllium
insert ottqcked to a depth of 1 mil on inner surfoce
and to a depth of 3 mils on outer surfoce
79
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