High-temperature ceramic composites directionally reinforced with high-entropy borides

DOI: 10.62564/M4-IB1144

Iurii Bogomol, Elmira Ferkhatly, Mantang Duan, Dmytro Rieznik, Serhii Ponomarchuk, Yaroslav Zaulychnyi, Oleh Stepanov, Vasyl Mosiak, Kira Kryvenko, Dmytro Palagecha

National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»


Materials based on boron and silicon carbides are increasingly used in industry due to its unique complex of physical and mechanical properties mostly at high temperatures up to 2000 o C [1]. One of the most effective ways to improve the strength of the ceramics is a fiber reinforcement, which is realized in the directional solidification of eutectic alloys. In recent years, high-entropy borides (HEB) have attracted considerable interest due to their potential applications as high-temperature structural materials [2]. I this work authors used high-entropy borides as the reinforced phase during directional solidification of eutectic alloys based on boron and silicon carbides [3]. The directionally solidified composites (В 4 С-HEB, SiC-HEB) were prepared by the floating zone method based on the crucible-free zone melting of compacted powders and Spark Plasma Sintering. B 4 C, SiC and powders of transitional metals diborides (TiB 2 , ZrB 2 , HfB 2 , TaB 2 and NbB 2 ) with technical purity were used as the initial materials. The microstructure of all as prepared alloys consists of B 4 C or SiC matrix uniformly reinforced by single phase diboride fibers and lamellas. The formation of eutectic structure, phase compositions and some mechanical properties of the directionally reinforced composites were discussed.

Keywords
Directionally solidified ceramic composites, high-entropy borides, eutectic composites

Acknowledgments
Not provided

References
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