High-temperature oxidation behaviour of SPS-prepared Mo and Mo-5Ta alloys

作者：Liu, Dawei; Zhang, Jiuxing; Huang, Lei; Li, Song; Nong, Binrong; Jin, Ying; Pan, Yafei^*

来源：Philosophical Magazine Letters, 2022, 102(11-12): 359-367.

DOI：10.1080/09500839.2022.2129110

• Mo-Ta alloys
• oxidation resistance
• microstructure

The high-temperature oxidation behaviour of SPS-prepared Mo and Mo-5Ta alloys are investigated under the temperature range 300-700 degrees C for 0-120 min in static air condition. The oxidation weight gains of Mo and Mo-5Ta conform to parabolic law at different oxidation times of 500 degrees C and all remain at low levels. At low temperature (<= 500 degrees C), the oxidation resistance improves with Ta addition. However, at 600 degrees C and 700 degrees C, the oxidation of Mo-5Ta increases and the weight gain is obvious. Compared with pure Mo, a continuous and dense oxide scale can be formed quickly on the surface of Mo-5Ta alloys during the oxidation process at 500 degrees C, which improves the oxidation resistance of the alloys. The volatile MoO3 and generated Ta2O5 above 500 degrees C cause more voids to form in the matrix, resulting in the deterioration of the oxidation resistance of the alloys.