Abstract
When coatings are strongly bonded to their substrates it is often difficult to measure the adhesion values. The proposed method, which is suggested naming “silver print test”, consists in covering the central part of the samples with a thin layer of silver paint, before coating. The process used for testing this new method was the Air plasma spraying (APS), and the materials used were alumina coatings on C35 steel substrates, previously pre-oxidized in CO2. The silver painted area was composed of small grains that did not oxidize but that significantly sintered during the APS process. The silver layer reduced the surface where the coating was linked to the substrate, which allowed its debonding, using the classical adhesion test ASTM C633-13, while the direct use of this test (without silver painting) led to ruptures inside the glue used in this test. The numerical modelling, based on the finite element method with the ABAQUS software, provided results in good agreement with the experimental measurements. This concordance validated the used method and allowed accessing to the values of adherence when the experimental test ASTM C633-13 failed, because of ruptures in the glue. After standardization, the “silver print test” might be used for other kinds of deposition methods, such as PVD, CVD, PECVD.
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Recommended by Editor Chongdu Cho
R. Bernardie is a Ph.D. graduate from the SPCTS laboratory of the University of Limoges. The area of her research concerns the study of the interfaces created during the plasma projection (APS) of alumina on nickel substrates oxidized under CO2. In this aim, she developed two major research axes, namely, the heterogeneous kinetics of nickel oxidation under CO2 and the plasma projection of alumina.
Joseph Absi is a senior member of the SPCTS laboratory of the University of Limoges at European Ceramic Center. He is responsible of Bachelor degree in the field of mechanical sciences engineering in the technical institute of the University of Limoges. He is working in the domain of the numerical simulation based on the finite element method. Its field of his expertise is concerned with the domain of the numerical calculation of thermal and mechanical properties of a wide variety of materials.
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Bernardie, R., Berkouch, R., Valette, S. et al. Experimental and numerical study of a modified ASTM C633 adhesion test for strongly-bonded coatings. J Mech Sci Technol 31, 3241–3247 (2017). https://doi.org/10.1007/s12206-017-0614-2
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DOI: https://doi.org/10.1007/s12206-017-0614-2