Paleontology

Infiltration (HVAC)

Composite material

Nanotechnology

Thermal barrier coating

Materials science

Vermiculite

Coating

Sediment

Physical vapor deposition

Chemical vapor deposition

Deposition (geology)

Electron beam physical vapor deposition

Biology

Surface and Coatings Technology

Thermal barrier coatings (TBCs) are protective coating systems that are mostly utilized to improve the thermal insulation and functional performance of gas turbine engines and other aircraft components that are both stable and movable. These coatings protect materials operating in harsh conditions from structural damage caused by corrosion, oxidation, the CaO-MgO-Al 2 O 3 -SiO 2 effect (CMAS), thermal shock , volcanic ash, and vermiculite deposits at high temperatures. In this study, CoNiCrAIY metallic bond coatings were coated on Inconel 718 super alloy using a high velocity oxygen-fuel (HVOF) deposition technique. Then, single YSZ, Gd 2 Zr 2 O 7 (GZ), and double YSZ/GZ based ceramic topcoats were applied to the bond coats by using the electron beam physical vapor deposition (EB-PVD) method. The produced TBC samples and the uncoated Inconel 718 superalloy substrate were subjected to vermiculite (VM) deposition at 1250 °C for 4 h, and then the coatings were characterized. To determine the phase structures, microstructural and mechanical properties of the TBCs, X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer elemental mapping analysis (EDS), stereo microscopy analyses, porosity, and hardness measurements were used. The obtained results were comparatively evaluated with the recent related studies in the literature. • The aim of this study is to investigate the VM behavior of innovative single- and double-layer TBC systems. • The VM infiltration has occurred through the surface of the Inconel 718 superalloy substrate and all other TBC systems. • HVOF-bond coating and EB-PVD GZ coating were used for deposition of the TBCs. • On the Inconel 718 super alloy surface, YSZ, Gd 2 Zr 2 O 7 , and YSZ/Gd 2 Zr 2 O 7 coatings were deposited. • The TBC systems' initial porosity percentages decreased, but the top coating hardnesses increased. • The TGO structure formed at the interface with the effect of high temperature.

Investigation of vermiculite infiltration effect on microstructural properties of thermal barrier coatings (TBCs) produced by electron beam physical vapor deposition method (EB-PVD)