Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Journal of the American Ceramic Society, 2022-09, Vol.105 (9), p.5543-5547

Ort / Verlag

Columbus: Wiley Subscription Services, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• A dual‐phase high‐entropy boride (HEB)/carbide (HEC) ceramic with a fine grain size was synthesized by a sequential boro/carbothermal process. In the first step, an Hf–Nb–Ta–Ti–Zr‐containing carbide was synthesized by a carbothermal reduction of oxides followed by the reaction of the carbide with B4C and ZrH2 to convert part of the carbide to boride. The resulting composition was ∼29 vol% HEB 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, HEC powders.