Abstract
The isothermal oxidation behavior at 900–1300°C for 20 h in air of bulk Ti3AlC2 with 2.8 wt% TiC sintered by means of hot pressing was investigated in the work. The isothermal oxidation behavior generally followed a parabolic rate law. The parabolic rate constants increased from 1.39×10−10 kg2·m−4·s−1 at 900°C to 5.56×10−9 kg2·m−4·s−1 at 1300°C. The calculated activation energy was 136.45 kJ/mol. It was demonstrated that Ti3AlC2 had excellent oxidation resistance due to the continuous, dense and adhesive protect scales consisted of a mass of α-Al2O3 and a little of TiO2 and/or Al2TiO5. In principle, the oxide scale was grown by the inward diffusion of O2− and the outward diffusion of Ti4+ and Al3+. The rapid outward diffusion of cations usually resulted in the formation of cracks, gaps, and holes.
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Xu, X., Li, Y., Mei, B. et al. Study on the isothermal oxidation behavior in air of Ti3AlC2 sintered by hot pressing. SCI CHINA SER E 49, 513–520 (2006). https://doi.org/10.1007/s11431-006-0513-8
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DOI: https://doi.org/10.1007/s11431-006-0513-8