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Development Of Partially Volatile Brazing Filler Alloys For High-Temperature Application And Resistance To Oxidation

Report Number: WADC TR 59-404 Part 2
Author: Bredzs, Nikolajs
Author: Schwartzbart, Harry
Author: Rudy, John F.
Corporate Author: Armour Research Foundation of Illinois Institute of Technology
Laboratory: Directorate of Materials & Processes
Date of Publication: 1961-06
Pages: 62
Contract: AF 33(616)-6882
Project: 7351 - Metallic Materials
Task: 73516
AD Number: AD0266715

The mechanical properties and the resistance to oxidation were determined for 304 stainless steel joints brazed with 61% Ni-39% In, 65% Ni-17% Cr-9% In-9% Si, 33% Ni-33% Cr-17% In-17% Ge, and 35% N-24% Cr-26% In-15% Ge filler alloys. The special technique developed for brazing these joints involved: (1) a method of preparation of the alloy so that a homogeneous and desired composition was available to fill the joint capillary, and (2) a method of volatilizing the melting point depressant which avoided the difficulty of boiling, while still obtaining sufficient volatilization to provide the required higher remelt temperature and good high-temperature properties. The highest shear strength was exhibited by the 65% Ni-17% Cr-9% Si alloy. The oxidation resistance of all joints was excellent. Joints brazed with the 61% Ni-39% In alloy showed considerable signs of oxidation after exposure to the open air for 500 hr at 1600 F.

Lockheed Martin Missiles & Fire Control
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