Title

Synthesis of Single-Phase High-Entropy Carbide Powders

Abstract

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.

Department(s)

Materials Science and Engineering

Comments

This research was conducted as part of the Enabling Materials for Extreme Environments Signature Area at Missouri S&T.

Keywords and Phrases

Carbothermal reduction; High-entropy carbide; Solid solution; Synthesis; Ultra-high temperature ceramics

International Standard Serial Number (ISSN)

1359-6462

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Acta Materialia Inc, All rights reserved.

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