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Start Over Author "Sun, C." Journal corrosion science
39 results on '"Sun, C."'

38. Oxidation and interfacial fracture behaviour of NiCrAlY/Al2O3 coatings on an orthorhombic-Ti2AlNb alloy

Author

Li, H.Q., Wang, Q.M., Jiang, S.M., Ma, J., Gong, J., and Sun, C.

Subjects
*OXIDATION, *ALUMINUM alloys, *FRACTURE mechanics, *ION plating, *THERMAL barrier coatings, *DIFFUSION, *SURFACE chemistry, *DYNAMIC testing of materials, *THERMOPHYSICAL properties
Abstract

Abstract: Al2O3 diffusion barriers of various thicknesses have been fabricated by filtered arc ion plating between the NiCrAlY coating and the O-Ti2AlNb alloy. Isothermal oxidation tests and three-point bend tests have been conducted to investigate the influence of the Al2O3 diffusion barriers on the oxidation and interfacial fracture behaviour of the coatings. The results indicate that the Al2O3 diffusion barrier defers interdiffusion and gives oxidation resistance of the NiCrAlY coatings. The thickness of the Al2O3 interlayer not only influences the oxidation behaviour but also affects the interfacial fracture properties. Additionally, thermal exposure affects the critical load in three-point bend tests. [ABSTRACT FROM AUTHOR]

Published
2011
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39. Ion-plated Al–Al2O3 films as diffusion barriers between NiCrAlY coating and orthorhombic-Ti2AlNb alloy

Author

Li, H.Q., Wang, Q.M., Jiang, S.M., Gong, J., and Sun, C.

Subjects
*ION plating, *ALUMINUM oxide, *METALLIC oxides, *DIFFUSION, *CHEMICAL systems, *TITANIUM alloys, *METAL coating, *CERAMIC metals, *OXIDATION, *MICROFABRICATION
Abstract

Abstract: Ion-plated Al–Al2O3 cermet films were fabricated as diffusion barriers between NiCrAlY coating and orthhombic-Ti2AlNb alloy. The oxidation and interdiffusion behaviour of coatings with and without diffusion barrier were investigated in isothermal and cyclic oxidation tests at 800°C. The results indicated that substantial interdiffusion and rapid oxidation degradation occurred in the coated specimens without diffusion barrier. With Al–Al2O3 diffusion barriers, deferred interdiffusion and improved oxidation resistance was observed. Among them, duplex coating containing 1Al–Al2O3 interlayer exhibited the best performance. Coefficient of diffusion hindering and factor of reaction hindering were proposed to compare and quantify the efficiency of the diffusion barriers. [Copyright &y& Elsevier]

Published
2010
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