Effect of TGO evolution and element diffusion on the life span of YSZ/Pt–Al and YSZ/NiCrAlY coatings at high temperature
Source abstract
Abstract
Abstract In this work, the growth of thermally grown oxides (TGO) on Pt–Al and NiCrAlY bond coats and the element diffusion behavior were investigated. During oxidation, TGO initiated at YSZ/Pt–Al interface developed from a α-Al2O3 mono-layer to a α-Al2O3+NiO/α-Al2O3 double-layer with the increase of thermal cycling temperature. While for YSZ/NiCrAlY coating, after exposed at 1100 °C for 240 h, a double-layered TGO was formed at the interface of NiCrAlY/substrate. It is composed of an upper layer of α-Al2O3, Cr2O3 and NiCr2O4 mixture and a bottom layer of α-Al2O3. After the coating was thermal cycled at 1200 °C for 96 h, a triple-layered TGO was generated containing a bottom layer of α-Al2O3, a middle layer of Al2O3 and Cr2O3, and an upper layer of mixed α-Al2O3, Cr2O3 and NiCr2O4. The multi-layered structure of TGO is caused by the difference of element diffusion rate and formation energy of oxides. It facilitates the alternative accumulation and release of stress. Thus, the consequent service life of YSZ/Pt–Al coating is better than that of YSZ/NiCrAlY coating.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advancements in Solid Oxide Fuel Cells · Catalytic Processes in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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