Chemistry: electrical and wave energy – Processes and products
Patent
1987-08-18
1990-01-02
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204 351, 204 371, 204 384, C25D 554
Patent
active
048911062
ABSTRACT:
Conductive, adherent, non-magnetic deposits are formed on quartz glass by first applying a thin gold layer to the glass, and then depositing silver over the gold. The gold is deposited directly onto a very clean quartz glass substrate from an organo-metallic compound, and then fired to produce a metallic gold layer no more than about 5 microinches thick. A silver layer is deposited over the gold by first laying down a thin strike layer at high voltage, and then electrodepositing a further silver layer under a controlled current density. During the deposition of the final silver layer, the current is preferably applied in a periodic reverse current-pulse manner. Prior to depositing the gold layer, the quartz glass may be cleaned by wiping with acetone and baking in a vacuum to remove further contamination.
REFERENCES:
patent: 3978272 (1976-08-01), Donley
patent: 4091172 (1978-05-01), Miller
patent: 4254546 (1981-03-01), Ullery, Jr.
Metal Finishing Guidebook and Directory for 1978, Metals and Plastics Publications, Inc. Hackensack NJ, pp. 312-317, 428-430.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co, N.Y., 1978, pp. 160-162, 257-263 and pp. 416-425.
Denson-Low Wanda
Hughes Aircraft Company
Leader William T.
Mitchell Steven M.
Tung T.
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