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| Naji, M. |
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| Petrov, R. H. | Madrid |
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| Ali, M. A. |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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| Rignanese, Gian-Marco |
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Kiilakoski, J.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2021Use of Different Process Gases for Manufacturing Isolating Alumina Coatings by Flame Spraying with Cords
- 2019Evaluating the toughness of APS and HVOF-sprayed Al2O3-ZrO2-coatings by in-situ- and macroscopic bendingcitations
- 2019Characterization of powder-precursor HVOF-sprayed Al₂O₃-YSZ/ZrO₂ coatings
- 2018Evaluating the toughness of APS and HVOF-sprayed Al2O3-ZrO2-coatings by in-situ- and macroscopic bendingcitations
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article
Evaluating the toughness of APS and HVOF-sprayed Al2O3-ZrO2-coatings by in-situ- and macroscopic bending
Abstract
<p>Thermally-sprayed ceramic coatings are commonly used in applications where high wear and corrosion resistance are essential. However, their inherently low toughness and resistance to impacts often limit their use. In bulk ceramics, the toughening effect of ZrO<sub>2</sub> has been successfully implemented in different compositions of Al<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>. Successful toughening leads to increased wear resistance and higher reliability. In this study, APS- and HVOF-sprayed Al<sub>2</sub>O<sub>3</sub>-40ZrO<sub>2</sub> coatings were characterized with SEM and XRD techniques. The toughness of the coatings was evaluated by measuring their strain tolerance with in-situ (SEM) three-point-bending and macroscopic four-point bending with acoustic emission instrumentation. The APS-coatings had a higher strain-to-fracture but failed abruptly. In HVOF-coatings, the cracking commenced earlier but proceeded slower with more crack deflections. The observed behaviour is likely to derive from the coarser microstructure of the APS-coatings, which allows strain distribution in a larger area unlike the finer structure with a lesser melting degree of the HVOF-coatings.</p>