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Materials and processing factors influencing stress evolution and mechanical properties of plasma sprayed coatings
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SYSNO ASEP 0505278 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Materials and processing factors influencing stress evolution and mechanical properties of plasma sprayed coatings Author(s) Matějíček, Jiří (UFP-V) RID, ORCID
Mušálek, Radek (UFP-V) RID, ORCID
Veverka, Jakub (UFP-V) ORCIDNumber of authors 3 Source Title Surface and Coatings Technology. - : Elsevier - ISSN 0257-8972
Roč. 371, 15 August 2019 (2019), s. 3-13Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords Alumina ; Copper ; Four-point bending ; Functionally graded materials ; In-situ curvature method ; Mechanical properties ; Plasma spraying ; Process-structure-property relationship ; Residual stress ; Water stabilized plasma Subject RIV JI - Composite Materials OECD category Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics R&D Projects GB14-36566G GA ČR - Czech Science Foundation (CSF) GA17-23154S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000472694300002 EID SCOPUS 85061192165 DOI 10.1016/j.surfcoat.2019.01.105 Annotation Residual stress is an important factor that may influence the integrity of plasma sprayed coatings, as well as the performance and lifetime of coated parts. The stress, in turn, is influenced by the properties of the substrate and coating materials and by the processing conditions. Moreover, specific stress-strain behavior of plasma sprayed coatings stems from their characteristic structure, which is again influenced by the spraying parameters. In this work, the curvature and temperature monitoring by “ICP” (In-situ Coating Properties) sensor was used to track the stress evolution during and after coating deposition and to determine the coating stiffness - this was complemented by 4-point bending, hardness measurement, microstructural observations and image analysis. Representative ceramic, metallic and composite coatings, including functionally graded materials (FGMs), were investigated. The effects of processing parameters, such as deposition temperature, particle temperature and velocity, deposition rate and coating/substrate material combination were demonstrated. Ceramic Al 2 O 3 coatings exhibited residual stress values in tens of MPa and extensive splat cracking - their moduli were higher when loaded in compression than in tension. Metallic coatings (Cu, W, and W + Cu composites) showed residual stress values in hundreds of MPa without significant cracking. Residual stresses as well as coating moduli were higher for mixed W + Cu composites than for 100% W or 100% Cu coatings, possibly as a result of stronger intersplat bonding across heterogeneous interfaces. It was also shown that residual stress profiles in W + Cu FGMs may be significantly altered by intentional design of the gradation profile and that experimental data evaluated by ICP during the actual deposition of the FGM coating were in good agreement with theoretical model based on data from the deposition of individual mixed W + Cu layers. Higher stress and modulus magnitudes were generally observed under conditions resulting in stronger bonding between the splats. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://www.sciencedirect.com/science/article/abs/pii/S0257897219301227?via%3Dihub
Number of the records: 1