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High-Temperature Oxidation Resistance Mechanism of 45CT Coating

Jian Wang

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Abstract

Arc-spraying technique was applied to prepare 45CT coating.The microstructure of as-prepared 45CT coating and the interfacial structure between the coating and substrate were analyzed by means of scanning electron microscopy,X-ray diffraction and metallographic microscopy.The high-temperature oxidation resistance and mechanism of 45CT coating were analyzed.At the same time,arc-sprayed conventional Ni-Cr coating was studied as a comparison.It was found that as-prepared 45CT coating had better high-temperature oxidation resistance than conventional Ni-Cr coating,which was attributed to the formation of a uniform and dense Cr2O3 layer on the surface of 45CT coating.Meanwhile,interfacial transition layer consisting of Ni-Cr-Fe,[Fe,Ni] and Fe was formed around the interface of 45CT coating and substrate to facilitate metallurgical bonding,resulting in enhanced interfacial bonding between the coating and substrate.

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What this paper is about

Arc-spraying technique was applied to prepare 45CT coating.The microstructure of as-prepared 45CT coating and the interfacial structure between the coating and substrate were analyzed by means of scanning electron microscopy,X-ray diffraction and metallographic microscopy.The high-temperature oxidation resistance and mechanism of 45CT coating were analyzed.At the same time,arc-sprayed conventional Ni-Cr coating was studied as a comparison.It was found that as-prepared 45CT coating had better high-temperature oxidation resistance than conventional Ni-Cr coating,which was attributed to the formation of a uniform and dense Cr2O3 layer on the surface of 45CT coating.Meanwhile,interfacial transition layer consisting of Ni-Cr-Fe,[Fe,Ni] and Fe was formed around the interface of 45CT coating and substrate to facilitate metallurgical bonding,resulting in enhanced interfacial bonding between the coating and substrate.

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Available abstract

Arc-spraying technique was applied to prepare 45CT coating.The microstructure of as-prepared 45CT coating and the interfacial structure between the coating and substrate were analyzed by means of scanning electron microscopy,X-ray diffraction and metallographic microscopy.The high-temperature oxidation resistance and mechanism of 45CT coating were analyzed.At the same time,arc-sprayed conventional Ni-Cr coating was studied as a comparison.It was found that as-prepared 45CT coating had better high-temperature oxidation resistance than conventional Ni-Cr coating,which was attributed to the formation of a uniform and dense Cr2O3 layer on the surface of 45CT coating.Meanwhile,interfacial transition layer consisting of Ni-Cr-Fe,[Fe,Ni] and Fe was formed around the interface of 45CT coating and substrate to facilitate metallurgical bonding,resulting in enhanced interfacial bonding between the coating and substrate.

Key concepts: Coating, Materials science, Microstructure, Layer (electronics), Scanning electron microscope, Substrate (aquarium), Composite material, Metallurgy

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High-Temperature Oxidation Resistance Mechanism of 45CT Coating — Research Paper | ScholarLens