Non-contact scribing process for organic maskants on metals or a

Details Non-contact scribing process for organic maskants on metals or a Non-contact scribing process for organic maskants on metals or a

1985-11-04

1987-12-29

Paschall, M. H.

Electric heating

Metal heating

By arc

219121EK, 219121LJ, 219121LA, 219121LN, 156643, 1562722, 29DIG2, B23K 2600

Patent

active

047162708

ABSTRACT:
A method is disclosed for scribing chemical milling maskant applied to a metal substrate by impinging a laser beam on the maskant and controlling the beam to penetrate through the maskant substantially without damaging the underlying metal. In carrying out the process, a metal part such as aluminum, titanium or their alloys is coated with an organic polymer maskant having absorption to a laser beam, a predetermined pattern is scribed in the maskant by impinging a laser beam, e.g. a Nd:YAG (neodymium doped yttrium aluminum garnet) laser, under controlled conditions to scribe a predetermined pattern in the maskant and substantially without damaging the underlying metal, removing the maskant portion within the circumscribed area of the pattern to expose the underlying metal and leaving the remaining maskant portion adhered to the substrate, immersing the metal substrate in a chemical milling solution, e.g. an alkali solution, under controlled conditions to remove a predetermined thickness of the exposed metal from the substrate, and thereafter removing the remaining maskant portion from the substrate.

REFERENCES:
patent: 4504354 (1985-03-01), George et al.
patent: 4568409 (1986-02-01), Caplan
IBM Technical Disclosure Bulletin, vol. 22, #12, May 1980--"Removal of SiO.sub.2 from Surfaces by Absorption of Laser Light", Fowler et al.

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