Two-Step Synthesis Process for High-Entropy Diboride Powders
Abstract
High-entropy diboride powders were produced by a two-step synthesis process consisting of boro/carbothermal reduction followed by solid solution formation. Nominally phase-pure (Hf,Zr,Ti,Ta,Nb)B2 in a single-phase hexagonal structure had an average particle size of just over 400 nm and contained 0.3 wt% carbon and 0.3 wt% oxygen. The fine particle size was due to the use of high-energy ball milling prior to boro/carbothermal reduction, which led to a relatively low synthesis temperature of 1650°C. Oxygen and carbon contents were minimized by completion of the boro/carbothermal reduction reactions under vacuum. This is the first report of synthesis of a nominally phase pure high-entropy diboride powder from oxides using a two-step process.
Recommended Citation
L. Feng et al., "Two-Step Synthesis Process for High-Entropy Diboride Powders," Journal of the American Ceramic Society, vol. 103, no. 2, pp. 724 - 730, Blackwell Publishing Inc., Feb 2020.
The definitive version is available at https://doi.org/10.1111/jace.16801
Department(s)
Materials Science and Engineering
Keywords and Phrases
Boro/Carbothermal Reduction; High-Entropy Diboride; Solid Solution; Synthesis
International Standard Serial Number (ISSN)
0002-7820; 1551-2916
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2019 The American Ceramic Society, All rights reserved.
Publication Date
01 Feb 2020
Comments
This research was conducted as part of the Enabling Materials for Extreme Environments Signature Area at Missouri S&T.