BRAZING BERYLLIUM FOR AEROSPACE APPLICATIONS

Journal Article · Sat Dec 01 04:00:00 EST 1962 · Welding J., (N.Y.)

OSTI ID:4763051

Cline, C L; O'Neill, R A

The results are summarized of several research programs directed toward producing beryllium brazements for service temperatures above 1000 deg F. Several silver base alloys and brazing processes were investigated to determine the effects of: (a) brazing temperature, (b) time above the Ag-Be eutectic temperature, (c) heating and cooling rates, (d) braze atmosphere and (e) the preferred braze alloy and brazing process. Results indicate that time- temperature relationships have a pronounced effect on the braze if the braze temperature is above the Ag--Be eutectic temperature (1616 deg F). Extended time periods above this temperature result in an increase in the formation of brittle beryllium intermetallics and porosity in the beryllium adjacent to the braze, decreasing the effective braze strength. The Ag--Cu--Li braze alloy yielded the highest elevated temperature strength. Both the induction process (used in conjunction with slow heating and a purified inert atmosphere) and the cold wall vacuum furnace process are acceptable for high temperature beryllium brazing. (auth)

• Research Organization: Lockheed Missiles and Space Co., Sunnyvale, Calif.
• NSA Number: NSA-17-006607
• OSTI ID: 4763051
• Journal Information: Welding J., (N.Y.), Journal Name: Welding J., (N.Y.) Vol. Vol: 41
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BERYLLIUM
BRAZING
BRITTLENESS
COOLING
COPPER ALLOYS
EUTECTICS
FURNACES
GASES
HEATING
HIGH TEMPERATURE
INDUCTION
INERT GASES
INTERMETALLIC COMPOUNDS
LITHIUM ALLOYS
METALS, CERAMICS, AND OTHER MATERIALS
POROSITY
ROCKETS
SILVER ALLOYS
SPACE VEHICLES
TEMPERATURE
TENSILE PROPERTIES
USES
VACUUM
VELOCITY