Effect of surface curvature on oxidation of a MCrAlY coating

Ying Chen; Xiaofeng Zhao; Ping Xiao

doi:10.1016/j.corsci.2019.108256

Effect of surface curvature on oxidation of a MCrAlY coating

Ying Chen, Xiaofeng Zhao, Ping Xiao

Materials Engineering

Shanghai Jiao Tong University

Research output: Contribution to journal › Article › peer-review

262 Downloads (Pure)

Abstract

The oxidation behaviour of a high velocity oxygen fuel (HVOF) sprayed MCrAlY coating at 1150 °C is studied. The rough coating surface shows site-specific oxidation: the oxides in the convex regions show duplex microstructure, consisting of outer (Ni,Co)(Cr,Al)2O4 and inner α-Al2O3; the oxides in the concave regions, however, show single-layered microstructure comprised of exclusive α-Al2O3. Diffusional analysis predicts that in order to form an exclusive α-Al2O3 scale the minimum Al concentration in the γ-phase matrix in the convex regions must be higher than that in the concave regions. The study provides new insight into oxidation of MCrAlY coatings.

Original language	English
Article number	108256
Pages (from-to)	1-9
Number of pages	9
Journal	Corrosion Science
Volume	163
Early online date	4 Oct 2019
DOIs	https://doi.org/10.1016/j.corsci.2019.108256
Publication status	Published - Feb 2020

Keywords

Curvature
MCrAlY coating
Oxidation

Access to Document

10.1016/j.corsci.2019.108256

Effect of surface curvature on oxidation of a MCrAlY coatingAccepted author manuscript, 3.34 MB

Cite this

@article{17567b22c93449c186a6d4ff4050c38b,

title = "Effect of surface curvature on oxidation of a MCrAlY coating",

abstract = "The oxidation behaviour of a high velocity oxygen fuel (HVOF) sprayed MCrAlY coating at 1150 °C is studied. The rough coating surface shows site-specific oxidation: the oxides in the convex regions show duplex microstructure, consisting of outer (Ni,Co)(Cr,Al)2O4 and inner α-Al2O3; the oxides in the concave regions, however, show single-layered microstructure comprised of exclusive α-Al2O3. Diffusional analysis predicts that in order to form an exclusive α-Al2O3 scale the minimum Al concentration in the γ-phase matrix in the convex regions must be higher than that in the concave regions. The study provides new insight into oxidation of MCrAlY coatings.",

keywords = "Curvature, MCrAlY coating, Oxidation",

author = "Ying Chen and Xiaofeng Zhao and Ping Xiao",

year = "2020",

month = feb,

doi = "10.1016/j.corsci.2019.108256",

language = "English",

volume = "163",

pages = "1--9",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Effect of surface curvature on oxidation of a MCrAlY coating

AU - Chen, Ying

AU - Zhao, Xiaofeng

AU - Xiao, Ping

PY - 2020/2

Y1 - 2020/2

N2 - The oxidation behaviour of a high velocity oxygen fuel (HVOF) sprayed MCrAlY coating at 1150 °C is studied. The rough coating surface shows site-specific oxidation: the oxides in the convex regions show duplex microstructure, consisting of outer (Ni,Co)(Cr,Al)2O4 and inner α-Al2O3; the oxides in the concave regions, however, show single-layered microstructure comprised of exclusive α-Al2O3. Diffusional analysis predicts that in order to form an exclusive α-Al2O3 scale the minimum Al concentration in the γ-phase matrix in the convex regions must be higher than that in the concave regions. The study provides new insight into oxidation of MCrAlY coatings.

AB - The oxidation behaviour of a high velocity oxygen fuel (HVOF) sprayed MCrAlY coating at 1150 °C is studied. The rough coating surface shows site-specific oxidation: the oxides in the convex regions show duplex microstructure, consisting of outer (Ni,Co)(Cr,Al)2O4 and inner α-Al2O3; the oxides in the concave regions, however, show single-layered microstructure comprised of exclusive α-Al2O3. Diffusional analysis predicts that in order to form an exclusive α-Al2O3 scale the minimum Al concentration in the γ-phase matrix in the convex regions must be higher than that in the concave regions. The study provides new insight into oxidation of MCrAlY coatings.

KW - Curvature

KW - MCrAlY coating

KW - Oxidation

U2 - 10.1016/j.corsci.2019.108256

DO - 10.1016/j.corsci.2019.108256

M3 - Article

SN - 0010-938X

VL - 163

SP - 1

EP - 9

JO - Corrosion Science

JF - Corrosion Science

M1 - 108256

ER -

Effect of surface curvature on oxidation of a MCrAlY coating

Abstract

Keywords

Access to Document

Fingerprint

Cite this