Microstructural Evolution during High-Temperature Oxidation of Ti2AlN Ceramics
Microstructural evolution of Ti2AlN ceramics during high-temperature oxidation in air has been revealed by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEGSEM), and energy-dispersive spectroscopy (EDS). After oxidation below 1200 °C, layered microstructures formed on Ti2AlN surfaces containing anatase, rutile, and α-Al2O3. Above 1200 °C, more complex layered microstructures formed containing Al2TiO5, rutile, α-Al2O3, and continuous void layers. With increasing temperature, anatase gradually transformed to rutile, and TiO2 reacted with α-Al2O3 to form Al2TiO5. Based on these microstructural observations, an oxidation mechanism for Ti2AlN ceramics is proposed.
Pietro VINCENZINI, Sheldon WIEDERHORN and Paolo COLOMBO
B. Cui et al., "Microstructural Evolution during High-Temperature Oxidation of Ti2AlN Ceramics", Advances in Science and Technology, Vol. 65, pp. 106-111, 2010