Laser marking method and ablative coating for use therein

Details Laser marking method and ablative coating for use therein Laser marking method and ablative coating for use therein

1984-12-17

1986-06-10

Smith, John D.

Coating processes

Electrical product produced

Welding electrode

427 82, 427343, 427438, 4273837, A01L 2148, C23C 1834

Patent

active

045942633

ABSTRACT:
Laser marking of metal surfaces, particularly semiconductor device packages, is accomplished by depositing an electroless nickel layer on the surface, converting the nickel surface to a form in which it is highly absorptive of radiant energy and exposing the converted nickel surface to laser energy through a mask. The resulting mark is highly resistant to abrasion and corrosion. In addition, the method is highly suitable for use with automated laser marking equipment. Furthermore, it appears that the presence of the converted electroless nickel surface in the region of welds increases the hermeticity of the welds. This is particularly useful in packages of the TO-3 type and similar types.

REFERENCES:
patent: 4233107 (1980-11-01), Johnson
patent: 4515867 (1985-05-01), Bleacher
Johnson, "Black Electroless Nickel . . . ", Metal Finishing, Jul. 1980, pp. 21-24.

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