Cyclic oxidation and diffusion barrier behaviors of oxides dispersed NiCoCrAlY coatings

An analytical approach to the β-phase coarsening behaviour in a thermally sprayed CoNiCrAlY bond coat alloy

“…6 lie in the similar range of the work reported by Li et al for the Alloy Nimonic 115 at 1100 C [52]. It is also worth noting that discrete oxide particles and thin oxide stringers have formed during HVOF spraying, these micro-sized, non-diffusional oxides can act as diffusion barriers which could tie up the β phase particles and allow large particles to form [68]. As a consequence, larger coarsening rate coefficient was obtained from experimental measurements.…”

Influences of chromium and hafnium additions on the microstructures of β-nial coatings on superalloy substrates

“…The thin film EDS results collected from these regions were inconclusive. However, recent work by Guo et al [79] and Peng et al [80,81] on oxide-dispersed NiAl and NiCoCrAlY based coatings suggests that these precipitates may actually be aluminum oxides. Further work is in progress to establish their identity.…”

Precipitation phases in the nickel-based superalloy DZ 125 with YSZ/CoCrAlY thermal barrier coating

“…Another heat-treatment of the samples was subsequently performed for 2 h at 1050 • C in vacuum, aiming to form a pre-oxide scale on the bond coat. These procedures were necessary to ensure a superior durability of EB-PVD TBCs and were reported in our previous work [18].…”

“…Interdiffusion behaviors between the coating and the superalloy have been investigated extensively [6,7,17,18]. The investigations are mainly focused on the interdiffusion behaviors between the Nibased coatings and Ni-based superalloys, as well as the effects on the mechanical properties of the superalloys [18][19][20][21][22].…”

“…The investigations are mainly focused on the interdiffusion behaviors between the Nibased coatings and Ni-based superalloys, as well as the effects on the mechanical properties of the superalloys [18][19][20][21][22]. Directionally solidified Ni-based superalloy DZ 125 has been widely applied as structural materials in advanced aero engine for gas turbine blades and vanes operating at high temperature [23].…”