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首页> 外文期刊>Materials Research Innovations >Improvement of intermediate-temperature oxidation resistance of Ti3AIC2 by pre-oxidation at high temperatures
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Improvement of intermediate-temperature oxidation resistance of Ti3AIC2 by pre-oxidation at high temperatures

机译：通过高温预氧化提高Ti3AIC2的中温抗氧化性

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摘要

Ti_3AlC_2 has good oxidation resistance at high temperatures owing to the formation of protective Al_2O_3 layer. However, as it is directly exposed to air at 500 ℃ and especially 600 ℃, the scales formed on Ti_3AlC_2 exhibits poor protectivity because of the oxidationinduced microcracks, which limits the potential application of this technologically important material. In this work, the oxidation resistance of Ti_3AlC_2 at 500 ℃ and 600 ℃ was significantly improved by pre-oxidation at 1000-1300 ℃ for a short time of 2 h in air. The oxidation of the pre-oxidized Ti_3AlC_2 at 600 ℃ generally obeyed a parabolic rate law instead of the speed-up linear relation in the case without pre-oxidation. As revealed by X-ray diffraction, Raman spectroscopy results and SEM observations, the remarkable improvement of oxidation resistance after pre-oxidation was attributed to the protective layers formed on Ti_3AlC_2 during pre-oxidation, which inhibited the formation of anatase TiO_2 that resulted in the oxidation-induced microcracks. Moreover, this work confirmed that the mechanism proposed previously for the anomalous oxidation of Ti_3AlC_2 in air at 500-600 ℃ was correct.
机译：由于形成保护性的Al_2O_3层，Ti_3AlC_2在高温下具有良好的抗氧化性。但是，由于Ti_3AlC_2上形成的水垢直接暴露于500℃，特别是600℃的空气中，由于氧化引起的微裂纹，其保护性较差，这限制了该重要技术材料的潜在应用。在这项工作中，通过在空气中短时间2 h在1000-1300℃下进行预氧化，可以显着提高Ti_3AlC_2在500℃和600℃下的抗氧化性。在没有预氧化的情况下，在600℃下预氧化的Ti_3AlC_2的氧化通常遵循抛物线速率规律，而不是加速线性关系。如X射线衍射，拉曼光谱结果和SEM观察所揭示的，预氧化后抗氧化性的显着提高归因于在预氧化过程中在Ti_3AlC_2上形成的保护层，这抑制了锐钛矿TiO_2的形成，从而导致了氧化引起的微裂纹。此外，这项工作证实了先前提出的在500-600℃空气中Ti_3AlC_2异常氧化的机理是正确的。

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