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Thickness Effects on the Fracture of Chromium Films on Polyethylene Terephthalate

Einfluss der Schichtdicke auf das Bruchverhalten von Chromschichten auf Polyethyleneterephthalat

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Zusammenfassung

Dünne Metallschichten auf Polymersubstraten werden bereits eingesetzt, um flexible und leichte elektronische Bauteile und Textilien herzustellen. Die mechanischen Eigenschaften der dünnen Metallfilme auf Polymersubstraten werden normalerweise hinsichtlich ihrer Bruch- und Adhäsionseigenschaften mittels eines Fragmentierungstests studiert. In diesem Beitrag wird der Ein- fluss der Schichtdicke und Mikrostruktur von Chrom-Schichten, die auf polyethyleneterephthalat-Substraten abgeschieden wurden auf ihre mechanischen Eigenschaften untersucht. Die Ergebnisse zeigen, dass die Bruchdehnung der Chromschichten mit zunehmender Schichtdicke abnimmt. Ein Ablösen der Beschichtung tritt erst nach 6 % Dehnung ein und ist unabhängig von der Schichtdicke. Die Messung der Grenzflächenadhäsion durch Vermessung der "Buckle-Geometrie" ist dabei sehr empfindlich, da sich das Substrat nach der Bildung einer "Buckle-Struktur" weiter verformen kann.

Summary

Thin films of metals on polymer substrates have already been used to create flexible and lightweight electronic devices and textiles. The mechanical properties of metal films on polymer substrates are normally studied in terms of the fracture and adhesion of the film with the fragmentation test. In this paper the thickness and film microstructure effects using Cr films deposited onto polyethylene terephthalate substrates are examined. The results show that the fracture strain of the Cr film decreases with increasing film thickness. Delamination of the film occurs only after 6 % strain and does not depend on the film thickness. The measurement of the interfacial adhesion using buckles is very sensitive because the polymer substrate can deform under the buckle.

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Authors and Affiliations

  1. Erich Schmid Institute for Materials Science, Austrian Academy of Sciences, Leoben, Austria

    Megan J. Cordill & Aidan A. Taylor

  2. Department of Materials Physics, Montanuniversität Leoben, Leoben, Austria

    Megan J. Cordill

  3. Hueck Folien Ges.m.b.H, Baumgartenberg, Austria

    Klaus Schmidegg

Authors
  1. Megan J. Cordill
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  2. Aidan A. Taylor
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  3. Klaus Schmidegg
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Correspondence to Megan J. Cordill.

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Cordill, M., Taylor, A. & Schmidegg, K. Thickness Effects on the Fracture of Chromium Films on Polyethylene Terephthalate. Berg Huettenmaenn Monatsh 156, 434–437 (2011). https://doi.org/10.1007/s00501-011-0032-1

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  • DOI: https://doi.org/10.1007/s00501-011-0032-1

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