Synthesis and densification of ultra-fine ZrC powders-effects of C/Zr ratio

Yu, Lei; Li, Feng; Lee, Hyung Ik; Silvestroni, L.; Sciti, Diletta; Woo, Yi Jin; Lee, Sea‐Hoon

doi:10.1016/j.ijrmhm.2019.03.001

Cited by 9 publications

(2 citation statements)

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“…1 Various methods have been used to synthesize these materials, including borothermal and carbothermal reduction of oxides, self-propagating hightemperature synthesis, and direct reaction of metal hydride precursors. [3][4][5][6][7] High-entropy ceramics such as high-entropy borides (HEBs) and carbides (HECs) are studied due to their improved mechanical properties such as hardness, toughness, and strength over single-metal borides and carbides. [8][9][10] HEBs and HECs are generally equiatomic, multi-metal ceramics of four or more metals.…”

Section: Introductionmentioning

confidence: 99%

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

Smith

Fahrenholtz

et al. 2022

J Am Ceram Soc.

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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.

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Section: Introductionmentioning

confidence: 99%

“…The UHTC borides typically have the AlB 2 structure, whereas the carbides have the rock salt structure 1 . Various methods have been used to synthesize these materials, including borothermal and carbothermal reduction of oxides, self‐propagating high‐temperature synthesis, and direct reaction of metal hydride precursors 3–7 …”

Section: Introductionmentioning

confidence: 99%