Interfacial characteristics and adhesion behaviour of ytterbium silicate environmental barrier coatings exposed to steam oxidation

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-03-21 DOI:10.1016/j.corsci.2025.112879

Ahmet Hilmi Paksoy, Daniel Scotson, Esma Yilmaz, Ping Xiao

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引用次数: 0

Abstract

Regardless of the processing technique and resulting microstructure, when Environmental Barrier Coatings (EBCs) are exposed to high temperature in an air or steam environments, oxidation of the silicon bond coat forms a Thermally Grown Oxide (TGO). This study investigates the effect of steam oxidation on failure of air plasma sprayed (APS) EBCs consisting of a Yb₂Si₂O₇ based topcoat and silicon bond coat, primarily focusing on changes at the topcoat and bond coat interface such as TGO thickness, interface roughness, pore size and pore morphology. Furthermore, it also explores the interfacial bonding behaviour at different length scales with scratch testing and in-situ cantilever beam bending. The findings reveal that the topcoat’s microstructure, including the crack network and grain size, influence the inhomogeneity in TGO thickness, while interfacial pore formation and non-uniform stress distribution weaken the TGO/topcoat interface.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.