The paper demonstrates how defects inherited from the deposition processes can severely impair lifetime of MCrAlY coatings in service. oxidation behavior two NiCoCrAlY was investigated at 1150 °C up to 500 h. had same nominal composition but were processed by different projection techniques: air plasma spray (APS) and high velocity oxy fuel (HVOF). Freestanding coating specimens extracted coate...

The high-velocity oxygen-fuel (HVOF) spraying process was used to fabricate conventional WC-10Co-4Cr coatings and FeCrSiBMn amorphous/nanocrystalline coatings. The synergistic effect of cavitation erosion and corrosion of both coatings was investigated. The results showed that the WC-10Co-4Cr coating had better cavitation erosion-corrosion resistance than the FeCrSiBMn coating in 3.5 wt.% NaCl ...

Modern gas turbine hot sections need to be protected from elevated temperature and damaging environments. This protection starts as a typically two layer coating system, the base layer or bond coat (BC) acts as a corrosion barrier and a kind of buffer for the thermal mismatch between the base material and the second top thermally protective layer or Thermal Barrier Coating (TBC). The BC is norm...