| Titre : |
Comparison of test methods estimating the stiffness of ultrathin coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Marcus Vinicius Tavares da Costa, Auteur ; Cristian Neagu, Auteur ; Pierre Fayet, Auteur ; Urban Wiklund, Auteur ; Hu Li, Auteur ; Klaus Leifer, Auteur ; E. Kristofer Gamstedt, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 743-752 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Couches minces
Elasticité
Essais (technologie)
Essais dynamiques
Etudes comparatives
Matériaux -- Propriétés barrières
Nanoindentation
Nanotechnologie
Polymères
Revêtements
Revêtements -- Propriétés mécaniques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
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. |
| Note de contenu : |
- MATERIALS AND METHODS : Samples - Tensile testing - Nanoindentation - Strain-induced elastic buckling instability for mechanical measurement - AFM peak-force measurements
- RESULTS AND DISCUSSION : Tensile testing - Nanoindentation - SIEBIMM - AFM peak-force measurement - Comparison of results
- CONCLUDING REMARKS
- APPENDIX A : EFFECTS OF THE CONDUCTIVE LAYER IN THE BARRIER COATING PROPERTIES |
| DOI : |
10.1007/s11998-018-0085-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0085-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30852 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 743-752
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