Coating processes – Electrical product produced – Welding electrode
Patent
1990-03-26
1991-01-22
Morgenstern, Norman
Coating processes
Electrical product produced
Welding electrode
427 96, 427123, 427125, 4271261, B05D 306, B05D 512
Patent
active
049870068
ABSTRACT:
This invention is directed to a method for producing a smooth and continuous pressure bonded layer of a material such as gold or other precious metal, to a substrate, such as a metal substrate, through the driving force of a pulsed laser. The method comprises the steps of selecting a laser transparent substrate, applying thereto a thin polymeric film, where said polymer is characterized by a high optical coefficient of absorption to the wavelength of said laser. Preferably, such coefficient is at least 2.times.10.sup.4 cm.sup.-1. To the polymeric film, a thin layer or film of the material, such as gold is applied. Thereafter, the laser transparent substrate, containing the dual layers is placed in close proximity to the substrate or workpiece upon which such material is to be deposited. To this assembly, a pulsed laser is directed through the transparent substrate toward the polymeric film and material layer, whereby the laser energy is absorbed by the polymeric causing heating and vaporization thereof over a controlled depth of such polymer film. The vaporization provides the necessary pressure to blow-off the remaining polymer film and propel the material layer onto the substrate or workpiece. The resulting pressure bonded layer, i.e. gold or other precious metal, is smooth and continuous.
REFERENCES:
patent: 3964389 (1976-06-01), Peterson
patent: 4245003 (1981-01-01), Oransky et al.
patent: 4588674 (1986-05-01), Stewart et al.
patent: 4702958 (1987-10-01), Itoh et al.
patent: 4743463 (1988-10-01), Ronn et al.
patent: 4895735 (1990-01-01), Cook
Roshon et al., "Printing by Means of a Laser Beam"; IBM Tech. Disc. Bull., vol. 7, #3, Aug. 1964.
Von Gutfeld, "Enhancing Ribbon Transfer Using Laser Printing", IBM Tech. Disc. Bull., vol. 17, #6, Nov. 1974.
Adrian et al., "A Study of the Mechanism of Metal Deposition by Laser-Induced Forward Transfer Process"; J. Vac. Sci. Tech. B5(5), Sep./Oct. 1987, pp. 1490-1494.
Alexander et al., "Laser Driven Micro-Explosive Bonding by Al Films to Cu and Si", J. of Mat. Sci. 23, (1988--No month given), pp. 2181-2186.
Williams Richard T.
Wrisley, Jr. David B.
Wu Jeff C.
AMP Incorporated
Morgenstern Norman
Noll William B.
Padgett Marianne
LandOfFree
Laser transfer deposition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laser transfer deposition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser transfer deposition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1554249