Method of treating gold plating film

Details Method of treating gold plating film Method of treating gold plating film

1990-07-25

1992-05-05

Albritton, C. L.

Electric heating

Metal heating

By arc

2191216, 21912166, B23K 2600

Patent

active

051110237

ABSTRACT:
To remove pores and lattice defects in gold film plated on a substrate, the gold plating film is irradiated with a first laser beam to bring at least the surface of the film into almost melted condition, and then cooled in air. Further, it is preferable to anneal the melted gold surface by a second laser beam weaker than the first laser beam before air cooling, thus reducing the thickness of the gold film and therefore the material cost of electric contacts, for instance.

REFERENCES:
patent: 4151014 (1979-04-01), Charschang et al.
patent: 4495255 (1985-01-01), Draper et al.
patent: 4724015 (1988-02-01), Sato et al.
patent: 4832798 (1989-05-01), Crijanovich et al.
Patent Abstracts of Japan, vol. 10, No. 107, dated Apr. 22, 1986 (relevant to Japanese Patent Application 60-238,464 assigned to Furukawa Denki Kogyo KK).
Chemical Abstracts, vol. 80, No. 20, dated May 20, 1974 (relevant to Metalloved, Term. Obrab. Metal., 1974).
"Der Laser in der Fertigungstechnik", by J. Steffen; Technische Rundschau, vol. 80, No. 37, dated Sep. 9, 1988, pp. 21-34.

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