Microstructure and phase evolution of Yb2SiO5/MoSi2-Mullite environmental barrier coatings on niobium alloy at 1500 °C
Source abstract
Abstract
Water-vapor corrosion behavior of Yb 2SiO 5/MoSi 2 -Mullite double-layer environmental barrier coating on Nb based alloy at 1500 °C was investigated systematically. Initially, the thermal grown oxide (TGO, mainly SiO 2) appearing undulating morphology was generated at the interface of Yb 2SiO 5/MoSi 2 -Mullite. Then, undulation characteristics of TGO layer were gradually weakened, and the maximum tensile stress near TGO layer reduced by ∼36%. With the internal diffusion of Yb 2O 3 and the generation of gaseous water-vapor corrosion substance, pores in the Yb 2SiO 5 layer, acting as diffusion paths for oxygen, induced continual thickening of TGO with an approximately line law, resulting in horizontal cracking near the TGO layer.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · High-Temperature Coating Behaviors · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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