ORNL-1816 - the Molten Salt Energy Technologies Web Site

ANP QUARTERLY PROGRESS REPORT
appearance of the as-received and tested Tic and
Cr,C,. These corrosion data are not selective
enough to designate whether Tic or Cr,C, is the
superior material. If the lower strength and/or
more brittle nature of the Cr,C, are obiectionable,
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Fig. 6.4. A-Nickel T-Joint Brazed with 60%
Pd-37% Ni-3% Si and Exposed to NaF-ZrF4-UF4
(53.540-6.5 mole %) at 15OO0F for 100 hr. Note
voids at the interface between the braze material
and the base metal. Unetched. 1OOX. Reduced
38%.
Fig. 6.5. A-Nickel T-Joint Brazed with 60%
Pd-37% Ni-3% Si and A led for 100 hr at
uated Capsule. Note voids at
he braze material and the base
metal. Unetched. 1OOX. Reduced 40%.
84
the Tic is superior. The ZrC showed signs of
failing only in the fluoride mixture; the fine in-
cipient cracks in the svrfaces of the ZrC particles
may be seen in Fig. 6.11. There were indications
that the fluoride mixture had penetrated the pore
spaces throughout the ZrC; the pore spaces were
not enlarged.
Fig. 6.6. A-Nickel T-Joint Brazed with 82%
Au-18% Ni and Exposed to Sodium Hydroxide for
100 hr at 1500OF. Note slight attack at surface
of braze. Etched with potassium cyanide. 200X.
Reduced 39%.
Fig. 6.7. A-Nickel T-Joint Brazed with 60%
Pd-37% Ni-3% Si and Exposed to Sodium Hy-
droxide for 100 hr at 1100OF. Note absence of
voids at interface. 1OOX. Reduced 39%.
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