Thin film floating zone metal coating technique

Details Thin film floating zone metal coating technique Thin film floating zone metal coating technique

1982-03-18

1985-02-26

Lawrence, Evan K.

Coating processes

Electrical product produced

Welding electrode

427 42, 427 96, 427 99, 427264, 427266, 4273744, B05D 302, B05D 312, B05D 500

Patent

active

045017689

ABSTRACT:
A method of coating or cladding existing metallurgical features of a dielectric substrate by sequentially blanket coating the substrate, inclusive of the metal features, with discrete levels of diverse metals forming alloy systems exhibiting a minimum in the liquidus curve, followed by heating the substrate to a temperature (T.sub.H) at or slightly above the lowest liquidus temperature in the phase diagram of the alloy system and below the melting points of the metal components. During heating to temperature, the metals interdiffuse forming a range of compositions changing with time to form liquid alloys which moves to the substrate surface where it wets and bonds to the metallic features while dewetting the bar substrate surface portions. On cooling the non-adhering portions the alloy can be suitably removed from the substrate surface, as by ultrasonic action, leaving an alloy of the metals strongly bonded only to the pre-existing metallurgical features.

REFERENCES:
patent: 3736167 (1973-05-01), Bachman et al.
patent: 4206254 (1980-06-01), Schmeckenbecher
Glasstone, S., The Elements of Physical Chemistry, New York, D. Van Nostrand Company, Inc., 1950, pp. 347-351.
Maissel, L. I. and Glang, R., Handbook of Thin Film Technology, New York, McGraw-Hill Book Company, 1970, pp. 1-73-1-80.
Gordon, P., Principles of Phase Diagrams in Materials Systems, New York, McGraw-Hill Book Company, pp. 139-142.
Hansen, M., Constitution of Binary Alloys, New York, McGraw-Hill Book Company, 1958, pp. 219-222 and 1029-1030.

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