External stress switching water corrosion behavior of SiC

Y Wang and JT Li and YX Li and YQ Huang and JY Bin and C Xiao and AY Lu and L Chen and JX Xu and YX Su and PF Shi and LM Qian, CERAMICS INTERNATIONAL, 51, 12323-12329 (2025).

DOI: 10.1016/j.ceramint.2024.08.303

As the promising thermal material for the hot-end components of the next-generation advanced gas turbine engines, the operation of SiC is threatened by high-temperature water corrosion accompanied by external stress. By using reactive molecular dynamics, the influence of external stress on the high-temperature water corrosion behavior of SiC material was investigated in this study. It was found that the water corrosion behaviors of SiC at 1000 K and 2000 K were quite different: At 1000 K, SiC slabs under tensile stress exhibited more severe corrosion, as evidenced by a greater number of atoms lost. In contrast, at 2000 K, the volatilization of Si-O-Si group diminished with the increase in external stress, resulting in a reduced loss of silicon atoms. Moreover, the atomic insights indicated that the greater number of bond bridges between the Si-O-Si group and tensile SiC slab led to the more stable existence of the Si-O-Si group as well as less loss of silicon atoms. This study not only could help to understand the influence of the slab stress on the high-temperature water corrosion of SiC materials but also contribute to the design of SiC hot end components.

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