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1 ANP QUARTERLY PROGRESS REPORT 19.1 39.0 pg/cm2 tBERYLLIVM INSERT LENGTH - 3.75 in ID-04301n UNCLASSIFIED ORNL-LR-DWG 4650 ution of Beryllium Around an oop Containing a Beryllium m. Test period, 270 hr. g. 6.2. Surfaces of Beryllium Insert from an nconel Thermal-Convection Loop After Exposure to Sodium for 1000 hr at 13OO0F. (u) Surface of beryllium exposed to sodium in annular space. (b) Surface of beryllium exposed to flowing sodium. OOX. Reduced 37.5%. under way to determine the minimum spacing that can be tolerated between beryllium and Inconel. STATIC CORROSION STUDIES E. E. Hoffman W. H. Cook C. F. Leitten Metallurgy Division Brazing Alloys on Stainless Steel Additional tests have been made in an effort to find a brazing alloy that has good resistance to both sodium and the fuel mixture NaF-ZrF,-UF, (53.5-40-6.5 mole %). The results reported in Table 6.5 were obtained from tests of type 304 stainless steel T-joints brazed with the alloys listed by the Wall Colmonoy Corporation. Tests are also being conducted on Inconel T-joints brazed with each of the alloys listed in Table 6.5. All the brazing alloys listed had good resistance to the fluoride mixture, but only alloy C-29 had good resistance to both the fluoride mixture and to sodium. Brazing Alloys on Nickel A series of T-ioints of A-nickel were brazed with the various alloys listed in Tables 6.6 and 6.7 in a dry hydrogen atmosphere and were then exposed for 100 hr to static NaF-ZrF,-UF, (53.5-40-6.5 mole %) at 1500°F or to static sodium hydroxide at 1100 and 15OOOF. The specimens were examined me- tallographically in the as-received condition in order to evaluate the inclusions and the porosity. The brazed specimens were thoroughly cleaned before and after testing so that Val id weight change data could be obtained. In order to prevent the rounding of the fillet edge upon polishing, each specimen was nickel plated after testing. The data obtained from metallographic examination of the specimens exposed to the fluoride mixture are presented in Table 6.6, and the data on the specimens exposed to sodium hydroxide are in Table 6.7. Most of the alloys tested appeared to have good corrosion resistance to the fluoride mixture, except the braze alloy with the composition 69% Ni-20% Cr-ll% Si. Several of the brazed T-ioints, especially those which included copper, gold, or silicon as an alloying element in the braze material, showed numerous voids in the interface between the base material and the braze fillet. These voids are not considered to be caused by the attack of the fluoride mixture but rather by diffusion of a 5 " 3 I -
PERIOD ENDING DECEMBER 10, 7954 Fig. 6.3. Diffusion Layer of Be,,Ni, Which Formed on lnconel in Direct Contact with Berylliuin Insert in a Thermal-Convection Loop After Exposure for 1000 hr to Sodium at 1300°F. Hardness impressions indicate relative hardnesses: Be2,Ni5, 1300 DPH; lnconel, 180 DPH. Etched with oxalic acid. !jOOX. constituent from the braze alloy into the base Table 6.7 shows the results obtained from the material. metallographic examination of the brazed A-nickel A T-joint brazed with 60% Pd-37% Ni- and therefore not a result of attack by the fluoride 1100 and 15OO0F, respectively, As may 'be seen m i xture. in Fig. 6.7, no attack occurred along the braze 81
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i PERIOD ENDING DECEMBER 70,7954 Fi
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