Thermochemical calculations of the oxidation behavior of Nb2AlC MAX phase in ZrO2–matrix composites

Stumpf M, Biggemann J, Fey T, Kakimoto KI, Greil P (2018)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Book Volume: 44

Pages Range: 15747-15753

Journal Issue: 13

DOI: 10.1016/j.ceramint.2018.05.249

Abstract

The oxidation behavior of Y-TZP/Nb₂AlC composite was explored by thermo-chemical phase equilibrium calculations and experimental oxidation studies at 1200 °C. Growth of a compact surface reaction layer requires migration of oxygen from the surface to the reaction front and a gradient of oxygen content is likely to develop. The results of phase equilibria calculations show that at low oxygen concentration preferential oxidation of Al favors thermal degradation of Nb₂AlC which yields Al₂O₃ and Nb-carbides. With increasing oxygen content various Nb-oxides are formed and finally a mixture of NbAlO₄and Nb₂O₅ is present after full oxidation of a Nb₂AlC particle. Experimental measurements confirmed the formation of a compact oxidation reaction layer at 1200 °C composed mainly of NbAlO₄ and a co-doped (Nb,Y)-TZP matrix.

Authors with CRIS profile

Involved external institutions

Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku Japan (JP)

How to cite

APA:

Stumpf, M., Biggemann, J., Fey, T., Kakimoto, K.-I., & Greil, P. (2018). Thermochemical calculations of the oxidation behavior of Nb2AlC MAX phase in ZrO2–matrix composites. Ceramics International, 44(13), 15747-15753. https://doi.org/10.1016/j.ceramint.2018.05.249

MLA:

Stumpf, Martin, et al. "Thermochemical calculations of the oxidation behavior of Nb2AlC MAX phase in ZrO2–matrix composites." Ceramics International 44.13 (2018): 15747-15753.

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