Abstract
Segmented vertical cracks in high-strain-tolerance thermal barrier coating (TBC) systems provide fast diffusion pathways for oxygen, leading to the accelerated growth of thermally grown oxide (TGO) interfaces. This results in a competition between enhanced strain tolerance and accelerated oxidation. Here, the effects of crack width on oxygen diffusion and TGO growth in TBCs with segmented vertical cracks and underlying mechanism were investigated experimentally and numerically. The findings reveal a critical crack width of approximately 4 μm, underscoring the importance of selecting an appropriate segmented vertical crack width to design TBCs with superior strain tolerance and sufficient oxidation resistance.
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