Synthesis of single-phase high-entropy carbide powders

High-entropy carbide powders were produced by a two-step synthesis process consisting of carbothermal reduction followed by solid solution formation. Nominally pure (Hf,Zr,Ti,Ta,Nb)C in a single-phase rock salt structure had an average particle size of about 550 nm and an oxygen content of 0.2 wt%....

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Bibliographic Details
Published in:Scripta materialia 2019-03, Vol.162, p.90-93
Main Authors: Feng, Lun, Fahrenholtz, William G., Hilmas, Gregory E., Zhou, Yue
Format: Article
Language:English
Subjects:
Carbothermal reduction
High-entropy carbide
Solid solution
Synthesis
Ultra-high temperature ceramics
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Summary:High-entropy carbide powders were produced by a two-step synthesis process consisting of carbothermal reduction followed by solid solution formation. Nominally pure (Hf,Zr,Ti,Ta,Nb)C in a single-phase rock salt structure had an average particle size of about 550 nm and an oxygen content of 0.2 wt%. The fine particle size was due to the use of high-energy ball milling prior to carbothermal reduction combined with the relatively low synthesis temperature of 1600 °C. Oxygen content was minimized by completion of the carbothermal reduction reactions under vacuum. This is the first report of synthesizing a high-entropy carbide powder using individual transition metal oxides and carbon as precursors. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.10.049