High-temperature properties of ZrB2–HfB2 and ZrB2–HfB2–SiC solid solutions

Keywords

high temperature ceramics, zirconium diboride, solid solutions, hot pressing, oxidation.

Cite as

Vedel D. V., Mazur P. V., Kozak І. V., Osipov А. Ye., and Brodnikovskyi М. P. High-temperature properties of ZrB₂–HfB₂ and ZrB₂–HfB₂–SiC solid solutions. Physicochemical Mechanics of Materials. 2025. 61(4), 096-104.

https://doi.org/10.15407/pcmm2025.04.096

Abstract

Solid (Zr_xHf_1–х)B₂ and (Zr_xHf_1–х)B₂–15 vol.% SiC composites were obtained by hot pressing. It was shown that the formation of homogeneous solid solution occurs at an equimolar ratio. The coreshell structure was formed in composite with 25 and 75 at.% HfB₂. In the first case, the core was pure zirconium diboride, and in the second – pure hafnium diboride. The shell composition corresponded to the chemical formula (Zr_0.75Hf_0.25)B₂ or (Zr_0.25Hf_0.75)B₂, respectively. The formation of an equimolar solid solution results in a 28% increase in high temperature bending strength in comparison to ZrB₂–15 vol.% SiC or HfB₂–15 vol.% SiC. At the same time, high oxidation resistance is observed in a solid solution close to hafnium diboride due to the formation of the (Hf_0.75Zr_0.25)SiO₄ and HfSiO₄ phases on the scale surface, which reduce the diffusion of oxygen into the material.

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