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Isothermal oxidation of bulk Zr2Al3C4 at 500 to 1000 °C in air

  • L.F. He (a1), Z.J. Lin (a1), Y.W. Bao (a2), M.S. Li (a2), J.Y. Wang (a2) and Y.C. Zhou (a2)...

Abstract

The isothermal oxidation behavior of Zr2Al3C4 in the temperature range of 500 to 1000 °C for 20 h in air has been investigated. The oxidation kinetics follow a parabolic law at 600 to 800 °C and a linear law at higher temperatures. The activation energy is determined to be 167.4 and 201.2 kJ/mol at parabolic and linear stages, respectively. The oxide scales have a monolayer structure, which is a mixture of ZrO2 and Al2O3. As indicated by x-ray diffraction and Raman spectra, the scales formed at 500 to 700 °C are amorphous, and at higher temperatures are α-Al2O3 and t-ZrO2 nanocrystallites. The nonselective oxidation of Zr2Al3C4 can be attributed to the strong coupling between Al3C2 units and ZrC blocks in its structure, and the close oxygen affinity of Zr and Al.

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a) Address all correspondence to this author. e-mail: yczhou@imr.ac.cn

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