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Detection of Crack Propagation in Film Coatings

IP.com Disclosure Number: IPCOM000075318D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Li, PC: AUTHOR [+2]

Abstract

Crack sensitivity of frangible films, such as glass, are currently detected and determined by use of a diamond pyramid hardness tester graphically illustrated in Fig. 1. However, ambiguous interpretation on the test results often arise, due to the reflection of an underlying substrate such as aluminum or other metals under the frangible film. The high reflectance of an extensive hillock formation on aluminum tends to severely obscure visual detection of such cracks.

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Detection of Crack Propagation in Film Coatings

Crack sensitivity of frangible films, such as glass, are currently detected and determined by use of a diamond pyramid hardness tester graphically illustrated in Fig. 1. However, ambiguous interpretation on the test results often arise, due to the reflection of an underlying substrate such as aluminum or other metals under the frangible film. The high reflectance of an extensive hillock formation on aluminum tends to severely obscure visual detection of such cracks.

The sensitivity of this test may be enhanced by using electrophoretic decoration of copper over the tested area. Whenever the crack propagates, it will be effectively decorated with copper and the entire cracked area will be well- defined by copper, as shown in Fig. 2. The electrophoretic copper decoration can be conducted, for example, at an applied voltage of approximately 0.5 to 10/6/ to 1 x 10/6/ volt/centimeter in acetone or methanol electrolytes for a given period of time depending on the type of film under examination.

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