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Article

Combinatorial Materials Design Approach to Investigate Adhesion Layer Chemistry for Optimal Interfacial Adhesion Strength

1
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, 3602 Thun, Switzerland
2
Department of Metallurgical and Materials Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA
3
Materials Department, University of California, Santa Barbara, Engineering II Building, 1355, Santa Barbara, CA 93106, USA
4
Institute of Applied Laser, Photonics and Surface Technologies ALPS, BFH, Bern University of Applied Sciences, Quellgasse 21, 2502 Biel, Switzerland
*
Author to whom correspondence should be addressed.
Equally contributing.
Academic Editors: Alex Montagne and Fancine Roudet
Crystals 2021, 11(4), 357; https://doi.org/10.3390/cryst11040357
Received: 16 March 2021 / Revised: 23 March 2021 / Accepted: 26 March 2021 / Published: 30 March 2021
(This article belongs to the Special Issue Advanced Nanoindentation in Materials)
A combinatorial material adhesion study was used to optimize the composition of an adhesion promoting layer for a nanocrystalline diamond (NCD) coating on silicon. Three different adhesion promoting metals, namely W, Cr, and Ta, were selected to fabricate arrays of co-sputtered binary alloy films, with patches of seven different, distinct alloy compositions for each combination, and single element reference films on a single Si wafer (three wafers in total; W–Cr, Cr–Ta, Ta–W). Scratch testing was used to determine the critical failure load and practical work of adhesion for the NCD coatings as a function of adhesion layer chemistry. All tested samples eventually exhibit delamination of the NCD coating, with buckles radiating perpendicularly away from the scratch track. Application of any of the presented adhesion layers yields an increase of the critical failure load for delamination as compared to NCD on Si. While the influence of adhesion layers on the maximum buckle length is less pronounced, shorter buckles are obtained with pure W and Cr–Ta alloy layers. As a general rule, the addition of an adhesion layer showed a 75% improvement in the measured adhesion energies of the NCD films compared to the NCD coating without an adhesion layer, with specific alloys and compositions showing up to 125% increase in calculated practical work of adhesion. View Full-Text
Keywords: adhesion; scratch testing; combinatorial materials science; nanocrystalline diamond coating; thin films adhesion; scratch testing; combinatorial materials science; nanocrystalline diamond coating; thin films
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MDPI and ACS Style

Schoeppner, R.L.; Putz, B.; Taylor, A.A.; Pethö, L.; Thomas, K.; Antonin, O.; Nelis, T.; Michler, J. Combinatorial Materials Design Approach to Investigate Adhesion Layer Chemistry for Optimal Interfacial Adhesion Strength. Crystals 2021, 11, 357. https://doi.org/10.3390/cryst11040357

AMA Style

Schoeppner RL, Putz B, Taylor AA, Pethö L, Thomas K, Antonin O, Nelis T, Michler J. Combinatorial Materials Design Approach to Investigate Adhesion Layer Chemistry for Optimal Interfacial Adhesion Strength. Crystals. 2021; 11(4):357. https://doi.org/10.3390/cryst11040357

Chicago/Turabian Style

Schoeppner, Rachel L., Barbara Putz, Aidan A. Taylor, Laszlo Pethö, Keith Thomas, Olivier Antonin, Thomas Nelis, and Johann Michler. 2021. "Combinatorial Materials Design Approach to Investigate Adhesion Layer Chemistry for Optimal Interfacial Adhesion Strength" Crystals 11, no. 4: 357. https://doi.org/10.3390/cryst11040357

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