Brazed nickel/columbium dissimilar metal pipe joints for 720 C service
Direct brazing was investigated for fabricating Hastelloy X/Niobium alloy dissimilar metal pipe joints for possible use in a Brayton cycle space power system. These joints must remain leak-tight in space for up to seven years at 720/sup 0/C (1328/sup 0/F). Design and fabrication are complicated because of differences in composition and thermal expansion between the Ni- and Nb-base components. Two filler metals, selected from eight candidate compositions, were used to fabricate five different pipe joint configurations. Joint strength and integrity were evaluated as-brazed, after thermal aging, and after rapid thermal cycling. Results showed that direct brazing is a viable method for fabricating the dissimilar metal pipe joints. Best results were obtained using a tongue-in-groove joint design with a niobium alloy tongue and a BNi-4 filler metal.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH
- OSTI ID:
- 6467006
- Journal Information:
- Weld. J. (Miami); (United States), Journal Name: Weld. J. (Miami); (United States) Vol. 56:10; ISSN WEJUA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320201 -- Energy Conservation
Consumption
& Utilization-- Transportation-- Air & Aerospace
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
42 ENGINEERING
425001 -- Engineering-- Power Cycles-- Brayton-- (1980-)
ALLOYS
BRAYTON CYCLE POWER SYSTEMS
BRAZED JOINTS
CHROMIUM ALLOYS
COBALT ALLOYS
ELECTRONIC EQUIPMENT
HASTELLOY X
HASTELLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IRON ALLOYS
JOINTS
MATERIALS
MOLYBDENUM ALLOYS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
NICKEL ALLOYS
NIOBIUM ALLOYS
PIPES
POWER SUPPLIES
SPACECRAFT POWER SUPPLIES
TUNGSTEN ALLOYS
WELDED JOINTS