ISSN 3041-1815. Physicochemical Mechanics of Materials. 2026.
Volume 62, Issue 3
High temperature oxidation resistance of medium-entropy diboride ceramics based on (Zr, Hf)B2 solid solution
Vedel D. V. 
Frantsevich Institute for Problems of Materials Science of the National Academy of Sciences of Ukraine, Kyiv, Ukraine. (https://ror.org/010jn4k46)
G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine. (https://ror.org/01a1qdv64)
Mazur P. V.
Frantsevich Institute for Problems of Materials Science of the National Academy of Sciences of Ukraine, Kyiv, Ukraine. (https://ror.org/010jn4k46)
Ilnitska Ya. V.
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine. (https://ror.org/00syn5v21)
Skoryk M. A.
G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine. (https://ror.org/01a1qdv64)
Keywords
ultra high-temperature ceramics, diborides, solid solution, oxidation.
Cite as
Vedel D. V., Mazur P. V., Ilnitska Ya. V., and Skoryk M. A. High temperature oxidation resistance of medium-entropy diboride ceramics based on (Zr, Hf)B2 solid solution. Physicochemical Mechanics of Materials. 2026. 62(3), 65-73.
References
High-temperature oxidation resistance of medium-entropy diboride ceramics based on (Zr, Hf)В2 solid solutions alloyed with TiВ2, NbВ2 and TaВ2 was investigated. Samples were produced by hot pressing and subjected to oxidation at 1500°C in air. It is found that ceramic oxidation has a selective mechanism and depends on the individual resistance of each diboride. The addition of Ti reduces oxidation resistance due to the intense formation of a liquid phase during oxidation, which leads to the formation of a thick, heterogeneous scale. Alloying with NbВ2 and TaВ2 promotes the formation of thinner oxide layers, but the oxidation mechanisms differ in the case of Nb, a liquid phase is present, whereas TaВ2 forms a dense surface layer of Ta2O5, which effectively reduces oxygen diffusion. The obtained results allow us to clarify the oxidation mechanisms of medium-entropy boride ceramics and identify promising areas for their further improvement.