Influence of isothermal oxidation on microstructure of YSZ and Mullite-YSZ thermal barrier coatings

• DOI: 10.1016/j.prostr.2020.01.116
• Publication Date: 2020-02-19T12:57:00Z
• Authors: David Jech; Ladislav Čelko; Michaela Remešová; Karel Slámečka; Pavel Ctibor
• Keywords: Mullite; Inconel; Isothermal process

Microstructural changes in conventional yttria stabilized zirconia (YSZ) and multilayer Mullite-YSZ/YSZ (M-YSZ) thermal barrier coatings were compared based on high temperature isothermal oxidation at the temperatures of 1050, 1150 1250 °C. Both types produced from commercially available powders utilizing atmospheric plasma spray technique. Initial M-YSZ powder mixture consisted 29 vol. % Mullite 71 YSZ. Inconel Alloy 713LC nickel-based superalloy was used as a substrate material (cylinders, 25 mm diameter 10 thickness). The TBCs lifetime, phase stability, thickness thermally grown oxide layer, porosity, microstructure after testing evaluated using light microscope, scanning electron microscope equipped with EDX analyzer, XRD