High-temperature behavior of oxide dispersion strengthening CoNiCrAlY

Review on Nickel Aluminide based Bond Coat Properties and Oxidation Performance for Thermal Barrier Coating (TBC) Application

“…4, it is shown that CoNiCrAlY with Al 2 O 3 gained lower mass at 0.12 mg/cm 2 and formed thinner TGO layer compared with no addition to CoNiCrAlY. Thus, the authors stated that future work should focus on Al 2 O 3 dispersions in NiAl based bond coat to avoid over doping issues [20] because of its excellent oxidation performance and capable to grow thin TGO layer. Comparison results between CoNiCrAlY and CoNiCrAlY/Al 2 O 3 are presented in Fig.…”

“…Specimen mass gains after various addition of Oxide Dispersion Strengthening (ODS) into CoNiCrAlY during isothermal exposure at 1100 °C in air with 10%H2O[20].…”

Effect of SiO2 Dispersion on Chlorine-Induced High-Temperature Corrosion of High-Velocity Air-Fuel Sprayed NiCrMo Coating

“…Consequently, less volatile metallic chlorides and accordingly voids formed in the corrosion products on the coating. Several explanations have been proposed for the lower oxidation rate of the oxide-dispersed alloys [19], [23], [58], [59]. Stringer et al [25] suggested that the dispersoids (such as ThO2, Y2O3, and CeO2) lying in the surface act as oxide nucleation sites, and led to a faster formation of a continuous Cr2O3 scale.…”

“…However, there are a few technical drawbacks with the commonly used thermal spray techniques, e.g., high velocity oxy-fuel (HVOF) and atmospheric plasma spraying (APS) to spray such coatings [19], [23]. As the dispersed oxides are usually very fine (˂ 1 µm), they can decompose at very high processing temperatures.…”

“…Another potential approach is to alter the coating architecture either by creating a new coating design, such as multilayered or functionally graded coatings [18], or by incorporating certain oxygenactive elements (like SiO2, Al2O3 or Y2O3) into the coating to fabricate composite structures [19], [20].…”