Long-term oxidation of Ti3Al0.8Sn0.2C2 in air at 1200 °C

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-05-08 DOI:10.1016/j.oceram.2024.100605

Hang Yin, Xiaodong He, Kebin Qin, Guangping Song, Yongting Zheng, Yuelei Bai

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Abstract

The addition of Sn into the raw materials is currently one of the most widely used methods to improve the purity and mechanical properties of Ti₃AlC₂. It follows in this work to investigate the oxidation behavior of the resulting Ti₃Al₀_.₈Sn₀_.₂C₂ at 1200 °C with the oxidation time up to 500 h. The oxidation kinetics shows that its oxidation resistance is much worse than that of common MAX phases including Ti₃AlC₂, Ti₂AlC, and Cr₂AlC. The oxide layer mainly consists of TiO₂ and Al₂O₃, with only a small amount of SnO₂ at the beginning of the oxidation stage. Cracks induced by the internal thermal stress penetrate through the entire oxide layer after only 1 h, which is an important reason for the rapid oxidation of the internal substrate layer. This work is expected to provide some inspiration and reference for Ti₃Al₀_.₈Sn₀_.₂C₂ used as the potential high-temperature structural material.

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Ti3Al0.8Sn0.2C2 在 1200 °C 空气中的长期氧化作用

在原材料中添加锡是目前最广泛使用的提高 Ti3AlC2 纯度和机械性能的方法之一。氧化动力学结果表明，Ti3Al0.8Sn0.2C2 的抗氧化性比常见的 MAX 相（包括 Ti3AlC2、Ti2AlC 和 Cr2AlC）差得多。氧化层主要由 TiO2 和 Al2O3 组成，氧化初期只有少量 SnO2。内部热应力诱发的裂纹仅在 1 小时后就穿透了整个氧化层，这是内部基底层迅速氧化的重要原因。这项工作有望为 Ti3Al0.8Sn0.2C2 用作潜在的高温结构材料提供一些启发和参考。

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