Metal fusion bonding – Process – Diffusion type
Patent
1973-01-29
1976-09-21
Lazarus, Richard B.
Metal fusion bonding
Process
Diffusion type
228195, 228238, 228263, B23K 3102
Patent
active
039814297
ABSTRACT:
For the diffusion bonding of members of titanium and some titanium alloys, layers of Cu, Ag and Ni are deposited by plating on both sides of a sheet of etched, chemically clean, titanium or titanium alloy foil of a thickness preferably less than 0.001 inch. The plated foil is interposed between faying surfaces of the members to be bonded together, and the members, with the interposed foil, are sealed under pressure, in an inert atmosphere and under partial vacuum or hard vacuum of, for example, 10.sup..sup.-4 Torr. The parts thus prepared are heated to brazing temperature to render liquidus plating material and thereby establish a diffusion bridge between each plated face of the foil and the adjacent faying surface of each of the members to promote atomic transport of titanium thereacross and established a joint therebetween. Heating is continued to induce atomic diffusion in the zone or region of the joint thus established between the titanium of the foil and the members, and between the members themselves, until the diffusion zone becomes principally titanium with traces of plating materials diffused throughout the region of the joint.
REFERENCES:
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patent: 3222775 (1965-12-01), Whitney
patent: 3365787 (1968-01-01), Forsberg et al.
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patent: 3466737 (1969-09-01), Hanink
patent: 3581382 (1971-06-01), Wells et al.
"Metals Handbook," 8th edition, vol. 1, published by American Society For Metals, see p. 5, brazing sheet.
Lazarus Richard B.
Rohr Industries, Inc.
Schlesinger Patrick J.
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