Improved oxidation resistance through an in-situ formed diffusion barrier: Oxidation behavior of amorphous multi-component FeCrAlMoSiY-coated Zr in high-temperature steam. (15th August 2021)

• Record Type: Journal Article
• Authors: Li, Yuhang; Meng, Fanping; Ge, Fangfang; Huang, Feng
• Is Part Of: Corrosion science. Volume 189(2021)
• Publication Date: 2021-08-15
• Subjects: Amorphous FeCrAlMoSiY coating -- In-situ formed diffusion barrier -- Magnetron co-sputtering -- High-temperature steam oxidation -- Y3Al5O12 scale; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109566
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: A novel multi-component amorphous FeCrAlMoSiY coating. Oxidation resistance in 1200 °C steam of the specimen was improved. Retarded coating-substrate interdiffusion by the in-situ formed Si-Zr layer. Protective α-Al2 O3 scale acts as a barrier to inhibit severe oxidation. Abstract: Long-term reliability of some systems for high-temperature applications has been hindered by intensive coating-substrate interdiffusion. Herein, we report a novel column-free multi-component FeCrAlMoSiY coating sputtered on zircaloy. During the 1200 °C steam oxidation, the Si atoms preferentially migrated to the coating-substrate interface to form a continuous Zr2 Si-rich diffusion barrier to inhibit both inward diffusion of the coating and outward of substrate elements. Therefore, the formation of protective α-Al2 O3 scale has been promoted, which effectively prevented the underlying coating and substrate being oxidized. Formation of the in-situ diffusion barrier and oxidation protection mechanisms of this coating were then discussed.