High-entropy boride–carbide ceramics by sequential boro/carbothermal synthesis

Smith II, Steven M.; Feng, Lun; Fahrenholtz, William G.; Hilmas, Greg E.; Huang, Tieshu

doi:10.1111/jace.18517

High-entropy boride–carbide ceramics by sequential boro/carbothermal synthesis

Journal Article · Mon Apr 25 00:00:00 EDT 2022 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.18517· OSTI ID:1866061

^[1]; Feng, Lun ^[1]; ^[1]; Hilmas, Greg E. ^[1]; Huang, Tieshu ^[2]

Missouri Univ. of Science and Technology, Rolla, MO (United States)
Kansas City Nuclear Security Campus (KCNSC), Kansas City, MO (United States)

We report a dual-phase high-entropy boride/carbide ceramic with fine grain size was synthesized by a sequential boro/carbothermal process. In the first step, a Hf-Nb-Ta-Ti-Zr-containing carbide was synthesized by carbothermal reduction of oxides followed by reaction of the carbide with B4C and ZrH2 to convert part of the carbide to boride. The resulting composition was ~29 vol% high-entropy boride with an average grain size of ~1.1 µm. Solid solution formation occurred at the densification temperature of 1900°C resulting in a relative density higher than 99%. The Vickers’ hardness was 26.5 ± 1.4 GPa. This is the first report of synthesizing dual-phase boride-carbide high-entropy ceramics from carbothermally synthesized, high-entropy carbide powders.

View Accepted Manuscript (DOE)

Research Organization:: Kansas City Nuclear Security Campus (KCNSC), Kansas City, MO (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002839

OSTI ID:: 1866061

Report Number(s):: NSC-614-4308; N000335755

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 105; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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