Coating processes – Electrical product produced – Welding electrode
Patent
1987-10-13
1989-11-21
Silverberg, Sam
Coating processes
Electrical product produced
Welding electrode
427431, C23C 204
Patent
active
048821993
ABSTRACT:
A method for producing a uniform metal coating on a substrate consisting of (1) selecting one or more metals to be coated onto the substrate wherein the metals are soluble in a molten salt when heated, (2) preparing a bath consisting of the dissolved metal-molten salt, (3) inserting a substrate into the bath, and (4) decreasing the temperature at the substrate to a level at which the metal will precipitate out of solution onto the substrate. Multiple coatings can be made by repeating the method using the same or different metal-molten salt systems. Deposition can be enhanced by adding more salt to the bath to increase precipitation of the metal onto the substrate or by introducing additional metal into the bath by electrolysis, either by electrowinning or electrorefining. The metal coating can be patterned by localized heating of the metal coating in the metal-molten salt bath to reverse deposition or by masking areas on the substrate prior to deposition.
The method can also be used to purify the metal or compound being precipitated by controlling the composition and processing parameters of the metal-molten salt bath. Alternatively, these same parameters can be controlled to deposit metals or compounds containing desired levels of specific impurities such as in the case of doped GaAs.
REFERENCES:
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patent: 2873216 (1959-02-01), Schmable
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patent: 4654237 (1987-03-01), Savitsky
Molten Salts Handbook, George J. Janz, Academic Press, 102-115, (Academic Press, New York, 1967).
"Dissolution of Metals in Fused Halides," E. A. Ukshe & N. G. Bukun, Russian Chemical Reviews, 30(2), 90-107 (1961).
"Miuxtures of Metals with Molten Salts" by M. A. Bredig, Molten Salt Chemistry, Edited by Milton Blander, 367-425 (Interscience Publishers, New York).
"High Temperature Equilibria in Metal", D. Cubicciotti, U.S. Atomic Energy Commission, 1947.
"Solutions of Metals in Molten Salts" D. Cubicciotti, Journal of Chem. Education, 27, 1960 (540-543).
Deposition Rechnologies for Films and Coatings by R. F. Bunshah et al., (Noyes Publication, New Jersey, 1982).
Sadoway Donald R.
Singh Rana P.
Massachusetts Institute of Technology
Silverberg Sam
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