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7685 |
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Friday, May 06, 2022, Hall K2 2:20 PM Process Diagnostics, Sensors & Controls |
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Evaluation of major factors influencing the coating formation in suspension plasma spraying (SPS |
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Robert Vaßen / Forschungszentrum Jülich GmbH, Germany Jana Joeris* / Forschungszentrum Jülich GmbH, Germany Ashutosh Tiwari/ Forschungszentrum Jülich GmbH, Germany Steffen Brinckmann/ , Oliver Guillon/ , |
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For the manufacture of columnar structured, strain tolerant thermal barrier coatings (TBC) the suspension plasma spraying (SPS) has proven to be a promising process. With this process it is possible to produce coatings with a wide range of microstructures, which can differ greatly in their properties. The properties of the TBCs are largely determined by the selected feedstock and the process parameters, such as the suspension solids content, feeding rate and plasma gas parameters, but also bondcoat surface properties have to be considered. For a detailed investigation of these effects, different suspensions, process conditions and substrate were studied. The used suspensions showed different viscosities, particle size distributions and solids loads. As process conditions, mainly the process gas and the net power of the used Axial III torch was varied. The surface topography was changed by depositing on substrates with both HVOF and VPS CoNiCrAlY bond coats. The produced coatings were characterised in detail including microstructural evaluation and mechanical tests by indentation. The results allowed an improved understanding of the complex interplay of the different process conditions. Key words: suspension plasma spraying, columnar structures, thermal barrier coatings |