Oxidation behaviours of high-entropy transition metal carbides in 1200 °C water vapor

High-entropy (Zr,Ti,Hf,Nb,Ta)C ceramic with single-phase rock salt structure was prepared by spark plasma sintering and their oxidation behavior was investigated at 1200 °C water vapor atmosphere. Results indicate that high-entropy carbides exhibit high oxidation resistance with a small mass gain pe...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-03, Vol.816, p.152523, Article 152523
Main Authors: Tan, Yongqiang, Chen, Chen, Li, Sigong, Han, Xiaochun, Xue, Jiaxiang, Liu, Tong, Zhou, Xiaosong, Zhang, Haibin
Format: Article
Language:English
Subjects:
Carbides
Ceramics
Entropy
Hafnium
Halites
High-entropy ceramics
Metal carbides
Niobium
Oxidation
Oxidation resistance
Plasma sintering
Scale (corrosion)
Spark plasma sintering
Tantalum
Titanium
Transition metals
Water vapor
Zirconium carbide
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Summary:High-entropy (Zr,Ti,Hf,Nb,Ta)C ceramic with single-phase rock salt structure was prepared by spark plasma sintering and their oxidation behavior was investigated at 1200 °C water vapor atmosphere. Results indicate that high-entropy carbides exhibit high oxidation resistance with a small mass gain per unit area of 6.6 × 10−2 kg/m2 after oxidation for 5 h. The parabolic rate constant kp of (Zr,Ti,Hf,Nb,Ta)C ceramic is almost two order of magnitude lower than that of ZrC ceramic. The high oxidation resistance is generally ascribed to the large lattice distortion and the formation of dense oxide scale which significantly suppressed the metal elements and H2O diffusion. •High-entropy transition metal carbides exhibit high oxidation resistance.•Large lattice distortion and the dense oxide scale is responsible.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.152523