DEVELOPMENT OF OXIDATION AND LIQUID SODIUM RESISTANT BRAZING ALLOYS

Technical Report · Fri Sep 13 04:00:00 EDT 1957

OSTI ID:4313740

Canonico, D A; Schwartzbart, H

BS>The first year's work has been completed at Armour Research Foundation on a program which has as its objectives: (1) the development of filler metals for brazing type 310 stainless steel to Inconel, the brazements to be resistant to oxidation and attack by molten sodium at 1650 deg F, and (2) the development of a simple test for the ductility of a brazed joint. Three metals--- iron, chromium and nickel---were selected, from oxidation and sodium resistance considerations, as the base metals from which to develop acceptable brazing alloys. From a study of all the available pertinent phase diagrams 91 alloys were devised, of which 16 satisfied the flow temperature and flowability requirements of the program. The flow temperature was between 1750 and 1900 deg F. Minimum flowability was three inches of length along a six-inch Tspecimen. T- specimens brazed with these 16 alloys were subjected to an oxidizing atmosphere for 500 hours at 165O deg F. Four alloys successfully withstood oxidation to a depth of less than 0.003 inch. A test for ductility of brazed joints, hnsed on the premise that the load necessary to cause cracking in the fillet of a braze is a measure of the ductility of the brazing alloy, has been developed. The test has shown itself to be capable of differentiating two filler alloys, although the large amount of scatter obtained required that a statistical analysis of the data be applied. Further development should reduce the scatter. (auth)

• Research Organization: Illinois Inst. of Tech., Chicago. Armour Research Foundation
• NSA Number: NSA-12-004842
• OSTI ID: 4313740
• Report Number(s): WADC-TR-57-648
• Country of Publication: United States
• Language: English

Related Subjects

ALLOYS
ALUMINUM ALLOYS
BRAZING
CEMENTS
CHROMIUM
CHROMIUM ALLOYS
CORROSION
CRACKS
DUCTILITY
FLUID FLOW
HIGH TEMPERATURE
INCONEL ALLOYS
IRON
JOINTS
LIQUID METALS
MATERIALS TESTING
MEASURED VALUES
MINERALOGY, METALLURGY, AND CERAMICS
NICKEL
NICKEL ALLOYS
NIOBIUM ALLOYS
OXIDATION
PHASE DIAGRAMS
PRESSURE
SODIUM
STABILITY
STAINLESS STEELS
TITANIUM ALLOYS