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%. 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.
L. Feng et al., "Synthesis of Single-Phase High-Entropy Carbide Powders," Scripta Materialia, vol. 162, pp. 90 - 93, Acta Materialia Inc, Mar 2019.
The definitive version is available at https://doi.org/10.1016/j.scriptamat.2018.10.049
Materials Science and Engineering
Keywords and Phrases
Carbothermal reduction; High-entropy carbide; Solid solution; Synthesis; Ultra-high temperature ceramics
International Standard Serial Number (ISSN)
Article - Journal
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01 Mar 2019