Microstructures and Interfacial Reaction of CrON Diffusion Barrier in the NiCrAlY-CrON Duplex Coating System during Thermal Treatment

Wei Zhou Li; Yue Qiao Li; Dan Qing Yi; Hui Qun Liu

doi:10.4028/www.scientific.net/AMR.239-242.206

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 239-242Microstructures and Interfacial Reaction of CrON...

Microstructures and Interfacial Reaction of CrON Diffusion Barrier in the NiCrAlY-CrON Duplex Coating System during Thermal Treatment

Abstract:

To decrease the interdiffusion, CrON interlayer as a diffusion barrier was introduced into the interface of NiCrAlY overlayer and DSM11 substrate. The microstructure and effect of the diffusion barrier were investigated. It was found that the as-deposited CrON diffusion barrier was comprised of Cr₂O₃ and CrN. During thermal treatment (including vacuum heat treatment and thermal exposure), the diffusion barrier was first transformed to Al₂O₃ and Cr₂N, then to Al₂O₃dominant interlayer, and porous mixed-oxides including TiO₂ and NiCr₂O₄ spinels were detected in the interdiffusion zone between the diffusion barrier and the substrate. The presence of α- Al₂O₃ in the diffusion barrier was the main reason for suppressing the interdiffusion. The interfacial reaction mechanism in the diffusion barrier was discussed by elemental diffusion and chemical reaction thermodynamics.

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Periodical:

Advanced Materials Research (Volumes 239-242)

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206-213

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https://doi.org/10.4028/www.scientific.net/AMR.239-242.206

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Online since:

May 2011

Authors:

Wei Zhou Li, Yue Qiao Li, Dan Qing Yi, Hui Qun Liu

Keywords:

Coating, Diffusion Barrier, Interdiffusion, Interface, Microstructure

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