In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating resistant 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used study microstructure performance in solution. The results show that is mainly comp...

This paper describes a new multilayer TBC that incorporates a 10 μm-thick oxygen barrier layer of yttrium–aluminum garnet (YAG) into a typical YSZ TBC system. The thermal conductivity of as-sprayed YAG/YSZ coatings was reduced due to excessive porosity and amorphous areas in the YAG layer. After long-term heat treatments, the conductivity of the multilayer was unaffected by the presence of YAG....

Rare earth elements have a great positive influence on the oxidation behavior and thereby lifetime of TBC systems. A commonly used EB-PVD NiCoCrAlY bondcoat was doped by Hf Zr in range 0.1–1 at.%. More than 3000 cycles were achieved Hf-doping 0.15?0.6 at.% which is large improvement. BCs provide high lifetimes about 2800 with low doping content 0.3 Microstructural changes, especially TGO, inclu...

Initial oxidation behavior of NiCoCrAlY coating prepared by arc-ion plating has been studied in air at 900, 1000 and 1100 °C. The results showed that phase transformation from transient θ-Al2O3 to α-Al2O3 was highly related the temperature time. oxide scale initial stage mainly composed 900 Instead, more amount emerged out with increasing temperature. elemental distribution after confirmed fast...