Oxide-scale growth on Cr2AlC ceramic and its consequence for self-healing

Oxide-scale growth on Cr2AlC ceramic and its consequence for self-healing

Outward growth of oxide scale on Cr2AlC surface during multiple annealing at 1100°C was investigated with ex situ microscopy. A dense alumina scale was formed on the surface of Cr2AlC samples after annealing for 40h. A wedge-shaped specimen with varying thickness of oxide scale was prepared by focus...

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Veröffentlicht in:Scripta materialia 2013-07, Vol.69 (2), p.203-206
Hauptverfasser: Yang, H.J., Pei, Y.T., De Hosson, J.Th.M.
Format: Artikel
Sprache:eng
Schlagworte:
Alumina scale
Aluminum
Aluminum oxide
Annealing
Ceramics
Cr2AlC ceramics
Diffusion
Grain boundaries
Microscopy
Oxidation
Oxides
Self-healing
Slicing
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Zusammenfassung:Outward growth of oxide scale on Cr2AlC surface during multiple annealing at 1100°C was investigated with ex situ microscopy. A dense alumina scale was formed on the surface of Cr2AlC samples after annealing for 40h. 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.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2013.04.013