Ion-plated Al–O–N and Cr–O–N films on Ni-base superalloys as diffusion barriers

Cyclic oxidation and diffusion barrier behaviors of oxides dispersed NiCoCrAlY coatings

“…Other proposed approaches involve diffusion barrier layers, such as TiN layer [20], Al-O-N thin-film layer [21,22], Cr-O-N thin-film layer [22], Re (W)-Cr-Ni layer [23,24] and Ni-W diffusion barrier [15]. Among various diffusion barrier candidates, ␣-Al 2 O 3 is a very effective diffusion barrier material to suppress the inter-diffusion between MCrAlY and superalloy [25,26].…”

Arc ion plated-Cr2O3 intermediate film as a diffusion barrier between NiCrAlY and γ-TiAl

“…The main disadvantage of NiCrAlY coatings is that the inward diffusion of Ni from NiCrAlY overlay coating to g-TiAl substrate lead to the formation of brittle interlayers and coating premature failure [4]. This problem might be addressed by the introduction of a diffusion barrier between the coating and substrate to eliminate or greatly reduce the interdiffusion of alloying elements [5][6][7][8][9][10][11][12]. In the present work, an intermediate film of arc ion plated Cr 2 O 3 was employed as a diffusion barrier between g-TiAl and NiCrAlY overlay coating and its effectiveness was investigated.…”

Microstructural characteristics and degradation mechanism of the NiCrAlY/CrN/DSM11 system during thermal exposure at 1100 °C

“…It is described that the interdiffusion accelerates the protective surface scales spalling and makes the continuous scales not regenerated because of the depletion of Cr and Al elements. Developing a diffusion barrier as an interlayer can effectively inhibit the elemental interdiffusion, thus markedly prolong the service life of the MCrAlY coatings [7].…”