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Oxidation behavior of high-purity nonstoichiometric Ti2AlC powders in flowing air

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Abstract

The oxidation behavior of nonstoichiometric Ti2AlCx (x = 0.69) powders synthesized by combustion synthesis was investigated in flowing air by means of simultaneous thermal gravimetric analysis-differential thermal analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscope/energy dispersive spectroscopy, with an effect of powder size. The oxidation of the fine Ti2AlC powders with the size of about 1 μm starts at 300 °C and completes at 980 °C, while with increasing the powder size around 10 μm the corresponding temperature increases to 400 and 1040 °C, respectively. The oxidation of nonstoichiometric Ti2AlCx (x = 0.69) powders is controlled by surface reaction in 400–600 °C, and mainly diffusion in 600–900 °C, with the corresponding oxidation activation energy of 2.35 eV and 0.12 eV, respectively. In other words, the critical temperature of changing oxidation controlling step is around 600 °C. The oxidation products were mainly rutile-TiO2 and α-Al2O3. The tiny white flocculent particles of α-Al2O3 appeared on the surface of fine Ti2AlC powders and increased with increasing the oxidation temperature.

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ACKNOWLEDGMENTS

This work was supported by National Natural Science Foundation of China (Grant No. 11302061), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 11421091), Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20132302120024), China Postdoctoral Science Foundation funded project (Grant No. 2013M531033), and the Fundamental Research Funds for the Central Universities. Dr. Yuelei Bai gratefully acknowledges the financial support from International Postdoctoral Exchange Fellowship Program (Grant No. 20130004).

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  1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150080, China

    Fanyu Kong, Ke Feng, Yuelei Bai, Ning Li, Xinxin Qi, Yongting Zheng, Rongguo Wang & Xiaodong He

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  1. Fanyu Kong
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  2. Ke Feng
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  3. Yuelei Bai
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Correspondence to Yuelei Bai.

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Kong, F., Feng, K., Bai, Y. et al. Oxidation behavior of high-purity nonstoichiometric Ti2AlC powders in flowing air. Journal of Materials Research 32, 2747–2754 (2017). https://doi.org/10.1557/jmr.2017.83

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