Oxidation Behavior and Residual Stress in Thermally Grown Oxides of Detonation and High Velocity Oxygen Fuel Sprayed NiCrAlY Coatings

Z.X. Chen; F.H. Yuan; Shijie Zhu; Zhong Guang Wang

doi:10.4028/www.scientific.net/MSF.546-549.1707

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Oxidation Behavior and Residual Stress in Thermally Grown Oxides of Detonation and High Velocity Oxygen Fuel Sprayed NiCrAlY Coatings

Abstract:

NiCrAlY coatings were prepared by the detonation spraying (DS) and high velocity oxygen fuel (HVOF) spraying processes, respectively. The DS NiCrAlY coating has higher oxidation rate than the HVOF NiCrAlY coating at 1100 oC due to its rougher surface and more mixed oxides. The residual compressive stress in thermally grown oxides (TGO) on the DS NiCrAlY coating is higher than that on the HVOF coating because the θ-Al2O3 to α-Al2O3 transformation causes the tensile stress in the TGO on the HVOF coating.

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Materials Science Forum (Volumes 546-549)

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1707-1712

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https://doi.org/10.4028/www.scientific.net/MSF.546-549.1707

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Online since:

May 2007

Authors:

Z.X. Chen, F.H. Yuan, Shijie Zhu, Zhong Guang Wang

Keywords:

Coating, HVOF, Oxidation, Residual Stress

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