Method of brazing beryllium-aluminum alloys

Details Method of brazing beryllium-aluminum alloys Method of brazing beryllium-aluminum alloys

1992-10-07

1993-11-23

Rosenbaum, Mark

Metal fusion bonding

Process

Plural joints

228206, 228252, 427309, B23K 3102

Patent

active

052636402

ABSTRACT:
A method is provided for joining Be-Al alloy structural members to yield a high shear strength at the interface. Surface oxides are first removed from the Be-Al alloy members. Aluminum is then selectively etched from the bonding surfaces to allow the flow of braze alloy into high aspect ratio capillary sites. A discontinuous ceramic reinforcing material, such as Al.sub.2 O.sub.3 or SiC in particulate or whisker form, is added in small quantities to a braze foil, such as Al-Si, to create a composite at the bond interface. The braze foil and reinforcing material are sandwiched between the Be-Al alloy members, and the joint is heated to above the liquidus temperature of the braze alloy but below the melting point of aluminum. The resulting interface shear strength of the Be-Al alloy bond has been tested to an average of about 60% of the parent alloy shear strength.

REFERENCES:
patent: 2169098 (1939-08-01), Howe
patent: 3093503 (1963-06-01), Laszlo
patent: 3555666 (1971-01-01), Rhee
patent: 3978253 (1976-08-01), Sahm
patent: 4260441 (1981-04-01), Prewo
patent: 4732314 (1988-03-01), Sakamoto

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