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Comparison of test methods estimating the stiffness of ultrathin coatings
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.ORCID iD: 0000-0002-0491-1077
Tetra Pak AB, DSO Packaging Mat, Ruben Rausings Gata, S-22186 Lund, Sweden.
Adhemon Sarl, Thin Technol, Ave Edouard Dapples 20, CH-1006 Lausanne, Switzerland.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
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2018 (English)In: Journal of Coatings Technology and Research, ISSN 1935-3804, Vol. 15, no 4, p. 743-752Article in journal, Editorial material (Refereed) Published
Abstract [en]

A key engineering parameter of thin coatings is their stiffness. Stiffness characterization of ultrathin coatings with a nanometer scale thickness is experimentally challenging. In this work, three feasible methods have been used to estimate the Young’s modulus of metal coatings on polymer films. The methods are: (1) nanoindentation, (2) strain-induced elastic buckling and (3) peak-force measurements integrated in atomic force microscopy. The samples were prepared by atomic layer deposition of TiO2 (6 and 20 nm thick) and mixed oxides of TiO2 and Al2O3 (4 and 20 nm thick). The differences in estimated Young’s modulus are interpreted in terms of the underlying assumptions and test conditions. Their specific advantages and drawbacks are also compared and discussed. In particular, the nanoindentation necessitates a sufficiently sharp indenter tip to make localized measurements dominated by the coating. The strain-induced elastic buckling method is simple in practice, but showed a large scatter due to variation in local coating thickness and irregular deformation patterns. The stiffness characterization using atomic force microscopy gave the most consistent results, due to a sharp tip with a radius comparable to the thinnest coating thickness. All methods gave a higher Young’s modulus for the TiO2 coating than for the mixed oxide coating, with a variation within one order of magnitude between the methods.

Place, publisher, year, edition, pages
2018. Vol. 15, no 4, p. 743-752
National Category
Nano Technology Manufacturing, Surface and Joining Technology
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URN: urn:nbn:se:uu:diva-352043DOI: 10.1007/s11998-018-0085-0ISI: 000439757000009OAI: oai:DiVA.org:uu-352043DiVA, id: diva2:1212061
Conference
13th Coatings Science International Conference (COSI), JUN 26-30, 2017, Noordwijk, NETHERLANDS
Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-10-12Bibliographically approved

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Tavares da Costa, Marcus ViniciusWiklund, UrbanLi, HuLeifer, KlausGamstedt, E. Kristofer

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