Browse Prior Art Database

MEASUREMENT OF THIN METAL COATING ADHESION

IP.com Disclosure Number: IPCOM000027082D
Original Publication Date: 1995-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 157K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the fabrication of a photoreceptor, a thin metal ground plane may be formed on a polymeric substrate such as polyethylene terephthalate (herein referred to as "PET"). It is important that the metal ground plane has good adhesion to the polymeric substrate to insure a photoreceptor's mechanical function during machine operation. Since the metal ground plane typically has a thickness of only about 200 angstroms, the thinness of the ground plane generally precludes determination of its adhesion strength to the polymeric substrate by a peel test. Thus, there is a need for a mechanical testing method which enables direct measurement of thin metal coating/substrate adhesion.

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XEROX DISCLOSURE JOURNAL

MEASUREMENT OF THIN METAL COATING ADHESION U.S. C1.073/150 Robert C.U. Yu

Proposed Classification

Int. C1. GOlb 21/08

In the fabrication of a photoreceptor, a thin metal ground plane may be formed on a polymeric substrate such as polyethylene terephthalate (herein referred to as "PET"). It is important that the metal ground plane has good adhesion to the polymeric substrate to insure a photoreceptor's mechanical function during machine operation. Since the metal ground plane typically has a thickness of only about 200 angstroms, the thinness of the ground plane generally precludes determination of its adhesion strength to the polymeric substrate by a peel test. Thus, there is a need for a mechanical testing method which enables direct measurement of thin metal coating/substrate adhesion.

Disclosed is a method which enables direct measurement of thin metal coatingkubstrate adhesion wherein the method comprises applying a polymeric coating directly over the metal ground plane thereby permitting the peel test to be carried out. The applied polymeric coating possesses one or more, preferably all, of the following properties: (a) the polymeric coating can be applied over the metal ground plane by for example either solution casting or lamination; (b) the polymeric coating is flexible and has a substantial thickness ranging for example from about 16 microns to about 50 microns to allow peeling; (c) the polymeric coating has a thermal contraction coefficient equivalent to that of the polymeric substrate such that the steps of coating, drying at elevated temperature, and cooling down to room ambient temperature do not cause the internal stress to build up in the polymeric coating and the ground plane (a sufficiently low level of internal stress is reflected in a sample which is free of curling) to a level which affects the ground planekubstrate bond stren...