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采用热重分析、XRD和SEM等方法研究Ti-Cr合金(0≤w(Cr)≤25%)从室温至1723K的非等温氧化行为及氧化膜的微观结构,探讨Cr元素对Ti-Cr合金抗氧化能力的影响机制。结果表明:当Cr含量小于某一临界值wC时,随着Cr含量的增加合金的抗氧化能力降低;当Cr含量高于wC时,随着Cr含量的增加合金的抗氧化能力提高;当温度高到1000K时,Ti-Cr合金的氧化仍符合抛物线规律,且主要发生钛的氧化;Ti-Cr合金氧化后基体中存在氧扩散层,氧化膜主要为金红石型TiO2,内层氧化膜出现富Cr现象,Cr氧化物的析出提高了Ti-Cr合金的抗氧化能力。金属和合金的着火是一个快速非等温氧化的过程,预测了Ti-Cr合金着火阶段的氧化机制。
The non-isothermal oxidation behavior of Ti-Cr alloy (0≤w (Cr) ≤25%) from room temperature to 1723K and the microstructure of the oxide film were investigated by means of TG, XRD and SEM. The effects of Cr on the Ti-Cr alloy Antioxidant capacity of the mechanism. The results show that when the Cr content is less than a certain critical value wC, the oxidation resistance of the alloy decreases with increasing Cr content. When Cr content is higher than wC, the oxidation resistance of the alloy increases with increasing Cr content. The oxidation of Ti-Cr alloy still parallels the parabolic law at 1000K, and the oxidation of Ti mainly occurs. The oxygen diffusion layer exists in the matrix after oxidation of Ti-Cr alloy, the oxide film is mainly rutile TiO2, the inner oxide film appears rich Cr phenomenon, the precipitation of Cr oxide improves the oxidation resistance of Ti-Cr alloy. The ignition of metals and alloys is a rapid non-isothermal oxidation process, which predicts the oxidation mechanism during the ignition of Ti-Cr alloy.