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well as in the tube-to-header joints of the manifold section. The tube-to- header joint,s could be repaired by rebrazing, but the leaks in the body of the unit are almost impossible to repair successfully. Examination of the completed unit, revealed several probable causes for the leaks and excessive distortion. This examination has led to techniques for overcoming these flaws in future brazing operations. The tube-to-fin leaks were thought to be caused by excessive use of Nicrohraz alloy, with the resultant dissolving away of the tube walls. The bad distortion a1 so tended to aggravate this situ- ation by allowing puddling of the molten brazing alloy. The formation of "hot spots" in the body of the assembly was also thought to he a prevalent condition. A very rapid heating rate was also an important factor in the warpage. Techniqucs that are planned for incorporation in further brazing operations are the use of lesser quantities of Nicrobraz, the use of several aspirators to promote more even hydragen flow between the €ins, the build-up of the whole assembly off the can hottom to overcome the drastic initial heating rate, and the use of a slightly lower brazing temperature. Brazing of Copper to Inconef, The need for a Satisfactory brazing alloy for joining copper fins to Inconel tubing has been emphasized. The resultant braze should have relatively high strength at 1500°F and should also be a diffusion barrier against capper penetration into the Inconel during service. It seems likely that some alloy other than a copper-base alloy would best fill these require- ments. Nicrobrazing at 1900°F is very promising, but the alloy does not completely me1 t at this temperature. It is hoped, however, that the use of other alloys very similar in compo- sition to Nicrobraz but of somewhat PERIOD ENQING DECEMBER 10, 1952 lower melting point w i l l result in a satisfactory brazed joint. In view of the possibility that it might be advisable to use copper-base alloy for the production of these tube-to-fin joints, several such alloys are being investigated. Small m e l t s of Cu-Re, Cu-Si, Cu-Sn, and Cu-Mn alloys have been prepared and are to be tested for flowability char act eri s ti c s , oxidation resistance , and room- and elevated-temperature tensile strengths. EVALUATION TESTS OF BRAZING ALLOYS G. M. Slaughter Y. G. Lane C. E. Schubert Metallurgy Division The results of recent high -tempera - ture oxidation tests and static cor - rosion tests in sodium hydroxide, sodium, and lithium are summarized in Table 12.4. The high -temperature oxidation tests were conducted in a stream of moist air at 1500°F on T specimens of Inconel and type 316 stainless steel brazed with the various alloys. The samples tested in molten sodium hydroxide at 1500°F were A nickel T j oints brazed with these alloys. Brazed Inconel and type 316 stainless steel T joints were used as specimens for the corrosion tests in sodium and lithium. The tensile strength of several brazed joints has been examined at, room and 1500" F temper a tures. Oxidation of Brazing Alloys. Ex- amination of metallographic sections of the high -temperature oxidation specimens showed the 60% Pd-40% N i alloy to be the most oxidation re- sistant of the brazing alloys tested. This alloy was unattacked when in contact with the base metals tested; the Inconel joint is shown in Fig. 12.5. An example of severe oxidation is shown in Fig. 12.6, which is the photomicrograph ofatype 316 stainless steel joint brazed with the 64% Ag-33% L65
BRAZING ALLOY Nic robr az 60% Mn-40% Ni 60% Pd-40% Ni 16.5%Cr-lO.O% Si- 73.5% Ni 16.5% Cr-IO. 0% Si- 2.5% Mn-?1.0% Ni 75% Ag-20% Pd- 5% Mn 64% Ag-33% Pd- 3% Mn TABLE 12.4. REBELTS OF 100 hr CORROSION TESTS OF BRAZING ALLOYS AT lSOO'F HIGH- TE,W ERATIJRE OXIDATION ON BRAZED INCONEL None Moderate Moderate Severe Slight 'Severe cr&cking preaent in joint. HIGH-TEMPERATURE OXIDATION ON BRAZED TYPE 316 STAINLESS STEEL None None None Moderate Severe STATIC CORROSION ON BRAZED A NICKEL IN NaOH Slight Severe None Fractured during examination Fractured during examination Severe Moderate STATIC CORROSION ON BRAZED INCONEL In Na None Moderate Severe Mod er a t e Moderate Severe severe In Li Moderate Moderate Severe Severe Slight Severe Severe STATIC CORROSION ON BRAZED TYPE 316 STAINLESS STEEL In Na Slight Moderate Moderate None* None* Severe Severe fn Li Severe Severe Severe Slight Severe Severe Severe
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Reports previously issued in this s
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e e e PAGE Moore Nullmatic pressure
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.. CrF. .Na. CrFd .Li. CrF6 .......
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PAGE Melting point of 60% Pd-40% Ni
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ANP PROJECT QUARTERLY PROGRESS REPO
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AYP PROJECT QUARTERLY PROGRESS REPO
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in the hot condition corresponds to
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c-' w FILL TANKS LINE VOLUME APPROX
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the disintegration rates and energi
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2. EXPERIMENTAL REACTOR ENGINEERING
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design of the first combination sea
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the construction of the shaft and r
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on packed seals for pumps and valve
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filling, fluoride leakage occurred
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for 1975 hr at 1500nF.~5) The first
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MASS VELOCITY ( Ib/hr .ft2) - PEXIO
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These conditions were maintained fo
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3. GENERAL DESIGN STUDIES A. P. Fra
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0 03 06 - PERIOD ENDING DECEMBER 10
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In the theory of power oscillations
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and The assumed boundary conditions
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where N, = number of atoms per cubi
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MSTANCE FROM REACTOR AXIS (in) Pmrm
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64 ANP PROJECT QUAMTEREY PROGRESS R
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AN€' PROJECT QUARTERLY PROGRESS R
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the last quarterly report,(') has b
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Design of the tower configuration a
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person received about four times th
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ANP PROJECT QUARTERLY PROGRESS REPQ
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ANP PROJECT QUAIRTEHLY PROGRESS REP
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AIYP PROJECT QUARTERLY PKQGRESS REP
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