Aluminum surface treatment to enhance adhesion in a given direct

Details Aluminum surface treatment to enhance adhesion in a given direct Aluminum surface treatment to enhance adhesion in a given direct

1977-01-21

1978-04-25

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

134 2, 156219, 204 58, B32B 3100

Patent

active

040861147

ABSTRACT:
A thin sheet of electrical grade aluminum is secured to a thin substrate sheet of epoxy/fiberglass or polyimide/fiberglass to form a multilayer card. This card is processed by printed circuit techniques to form the electrical circuit pattern of a printed circuit motor armature. The surface of the aluminum sheet which confronts the substrate sheet is processed in a manner to have a continuous pattern of oblong depressions generally normal to the surface. The major axes of these depressions are generally aligned with each other, and define the direction of the higher adhesion strength. The major axes of these depressions are in alignment with the direction of the electrical conductors constituting the armature circuit pattern. The aluminum surface, containing these depressions, includes a thin, clear, continuous unsealed anodized coating.

REFERENCES:
patent: 3249958 (1966-05-01), Haracz
patent: 3498870 (1970-03-01), Fritchey
patent: 3674619 (1972-07-01), Scher et al.
patent: 3891516 (1975-06-01), Chu
patent: 3928527 (1975-12-01), Wohnhaas et al.
patent: 3935080 (1976-01-01), Gumbinner et al.
patent: 4011150 (1977-03-01), Peterson

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