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2183 |
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Monday, May 03, 2010, Hullet Room 11:30 AM Gas Turbines 1 |
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Suspension plasma spraying (SPS) as a promising process for the manufacture of thermal barrier coatings (TBCs) |
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Alexandre Guignard* / Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK), IEK-1: Materials Synthesis and Processing, Germany Holger Kaßner/ Forschungszentrum Jülich GmbH, Institut für Energieforschung (IEF-1), Germany Robert Vaßen/ Forschungszentrum Jülich GmbH, Institut für Energieforschung (IEF-1), Germany Detlev Stöver/ Forschungszentrum Jülich GmbH, Institut für Energieforschung (IEF-1), Germany |
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Suspension Plasma Spraying (SPS) is an emerging process as an alternative to Atmospheric Plasma Spraying (APS). In SPS a suspension instead of a powder is injected in the plasma jet. By using a carrier liquid, it is possible to spray submicron ceramic particles in order to manufacture finely structured coatings. This process enables to obtain highly segmented coatings with a high strain tolerance and still relatively high porosity. These properties enable the SPS process to be particularly suitable for the fabrication of Thermal Barrier Coatings. On the other hand, the porous microstructure with its submicrometer sized pores might lead to enhance sintering during high temperature treatment. Sintering on free-standing coatings already showed that the porous structure is largely maintained. In this investigation the main focus is laid on sintering of complete TBC systems in a thermal gradient as it can be performed in our thermal cyclic rigs. Lifetime of the coatings at moderate surface conditions have been found to be excellent, new results on very high temperatures (1400°C and above) will be presented. |