High-temperature self-healing CoCrWSi coating based on defect-filling and pinning effects
Source abstract
Abstract
Co-29Cr-7W-5Si (wt%) was prepared via high-velocity oxygen-fuel system. Its oxidation behavior at 1100 °C in air containing water vapour was investigated. The oxidation kinetics of the coatings for 150 h was established using classical oxidation theory. After multiple cycles of thermal shock oxidation followed by water quenching, a dense Cr 2O 3 protective layer was formed on the surface of the coating, beneath which a SiO 2 pinning layer was generated. Although this significantly enhanced its oxidation resistance, longitudinal cracks occurred because of thermal stress. After 144 cycles, the cracks underwent filling-type self-healing owing to rapid diffusion and oxidation.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advanced materials and composites · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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