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Isothermal Oxidation of Ta2AlC in Air

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The oxidation behavior, in air, of bulk polycrystalline Ta2AlC samples was studied in the 600°–900°C temperature range. A protective, essentially X-ray amorphous, oxide layer—which does not appear to be resistant to thermal cycling—forms at 600°C. This layer is comprised of Ta, Al, and O. At 700°C and above, it is compositionally quite uniform, but porous and highly cracked. No phase separation was observed at the micrometer scale. The oxide layers consisted of the crystalline phases, Ta2O5 and TaAlO4, and an X-ray amorphous phase. In the 700°–900°C temperature range, the oxidation kinetics were found to be linear.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104

Publication date: 2006-09-01

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