The High Temperature Oxidation Resistance and Anti-Oxidation Mechanism of Plasma-Sprayed NiCrAlY Coatings on Stainless Stell

Abstract:

The coating was made of base coating (NiCrAlY) and superficial coating (ZrO2 + Y2O3) by plasma spray. The microstructure and phase structure of the coating were investigated by using the scanning electron microscope and the X-ray diffraction. The oxidation process can be divided into three stages: The main oxidation products is θ-Al2O3 but not continuous α-Al2O3 film in oxidation prophase; Continuous α-Al2O3 film generated quickly with the transition of θ-Al2O3 to α-Al2O3 in the oxidation reaction. The oxidation reaction becomes complicated when the content of Al decrease and Ni is also oxidized to NiO. Oxidation kinetics curves of 1200°C is basically accord with parabolic law.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1814-1817
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1814
• Online since: January 2013
• Authors: Yan Ping Qu, Yan Ping Qu, Jia Tao Liu, Yan Feng Wang
• Keywords: Plasma Spray, Transition Layer, Α-Al₂O₃ Film

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