Acta Metallurgica Sinica (English Letters) ›› 2024, Vol. 37 ›› Issue (4): 739-748.DOI: 10.1007/s40195-023-01647-z

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Oxidation Resistance of In Situ Reaction/Hot Pressing Synthesized Ti2AlC-20% TiB2 Composite at 600-900 °C in Air

Wenting Wang1,2, Jingjun Xu1(), Jun Zuo1, Ke Ma1, Yang Li1,2, Guangqi He1, Meishuan Li1   

  1. 1Shengyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    2School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
  • Received:2023-09-25 Revised:2023-11-06 Accepted:2023-11-14 Online:2024-04-10 Published:2024-01-28
  • Contact: Jingjun Xu, jjxu@imr.ac.cn

Abstract:

The oxidation behavior and kinetics of Ti2AlC-20vol.%TiB2 composite at 600-900 °C in air were investigated. The results showed that the oxidation kinetics of the composite followed a logarithmic law within the given temperature range, which indicated that the composites had excellent oxidation resistance. The selective oxidation of Al in Ti2AlC was greatly enhanced, which facilitated the formation of a continuous and dense protective layer of Al2O3. Meanwhile, the existence of molten B2O3 inhibited the outward diffusion of Ti and inward diffusion of oxygen, which prevented the growth of anatase TiO2 at 600 °C and rutile TiO2 at 700-900 °C. Therefore, the incorporation of TiB2 completely inhibited the abnormally rapid oxidation of bulk Ti2AlC at 600 °C and improved its oxidation resistance at 700-900 °C.

Key words: MAX phase, Ti2AlC-TiB2 composite, Intermediate temperature oxidation, Oxidation kinetics