Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2024 Volume 22, Issue 4
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Duan MANTAN, V.T. MOSIAK, D.L. PALAHECHA, K.V. KRYVENKO, S.H. PONOMARCHUK, D.O. RIEZNIK, Ya.V. ZAULYCHNYI, O.V. STEPANOV, D.S. LEONOV, M.Yu. BARABASH, and Yu.I. BOHOMOL

Structure and Properties of a Composite Material Based on Silicon Carbide Reinforced with High-Entropy Diboride at the Mesolevel
959–971 (2024)

PACS numbers: 61.72.Ff, 62.20.de, 62.20.Qp, 62.23.Pq, 81.05.Je, 81.40.Np, 81.70.Jb

Directionally solidified SiC/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 eutectic ceramics is prepared by the floating zone method based on the crucibleless zone melting of compacted powders using silicon carbide and transition-metal diboride (TiB2, ZrB2, HfB2, NbB2 and TaB2) powders as initial materials. The microstructure of as-prepared composites consists of a silicon carbide matrix uniformly reinforced on mesoscopic level by a single-phase high-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 diboride. The XRD analysis of the composites confirms the presence of the following phases in their compositions: SiC and (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2. The effect of the solidification rate on the microstructural and micromechanical characteristics of the SiC/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 ceramics is revealed. As found, an increase in the solidification rate leads to a decrease in the size of the reinforcing phase and an increase in hardness and fracture toughness from 22.2 to 24.9 GPa and 3.6 to 3.9 MPa?m1/2, respectively

KEY WORDS: silicon carbide, high-entropy borides, directionally solidified eutectic composites, Vickers hardness, fracture toughness

DOI:  https://doi.org/10.15407/nnn.22.04.959

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