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Oxide-scale growth on Cr_2AlC ceramic and its consequence for self-healing

机译:Cr_2AlC陶瓷上的氧化皮生长及其对自修复的影响

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摘要

Outward growth of oxide scale on Cr_2AlClC surface during multiple annealing at 1100 °C was investigated with ex situ microscopy. A dense alumina scale was formed on the surface of Cr_2AlC samples after annealing for 40 h. A wedge-shaped specimen with varying thickness of oxide scale was prepared by focused ion beam slicing for further annealing. It is concluded that the outward diffusion of Al ions via grain boundaries dominates the growth of oxide scale during repeated annealing. This result is relevant to the self-healing kinetics of exposed cracks in MAX phase ceramics via cyclic heating.
机译:用异位显微镜研究了在1100°C多次退火过程中Cr_2AlClC表面氧化物垢的向外生长。退火40 h后Cr_2AlC样品表面形成致密的氧化铝鳞片。通过聚焦离子束切片制备具有不同氧化皮厚度的楔形试样,以进一步退火。可以得出结论,在反复退火过程中,Al离子通过晶界向外扩散控制了氧化皮的生长。该结果与通过循环加热在MAX相陶瓷中暴露的裂纹的自愈动力学有关。

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