Electric heating – Metal heating – By arc
Patent
1990-07-25
1991-09-17
Albritton, C. L.
Electric heating
Metal heating
By arc
21912185, B23K 2600
Patent
active
050497189
ABSTRACT:
A method is disclosed for laser bonding two highly reflective electrical members. The first electrical member is coated with a coating alloy containing the metal of the second electrical member and a coupling material that is well absorbent of laser energy at the laser beam wavelength, has a lower melting point than either of the electrical members, and has a low solubility in a solid bond alloy of the electrical members. The laser characteristics are selected so that as bonding occurs a bond alloy of the electrical members solidifies and a solidification front drives the molten coupling material away from the bond interface toward the exterior periphery of the bond, so that substantially all of the solidified bond interface and bond interface strength results from the bond alloy. Coating a copper lead with a coating alloy containing gold and a coupling material, and then contacting the coated copper lead with a gold bonding pad provides for gold-to-gold TAB tape laser bonding.
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Galanakis Claire T.
MacKay Colin A.
Parker John C.
Spletter Philip J.
Albritton C. L.
Digital Equipment Corporation
Microelectronics and Computer Technology Corporation
Sigmond David M.
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