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Heretophase Ceramics in the Hf–Si–Mo–B System Fabricated by the Combination of SHS and Hot Pressing Methods

  • PHYSICAL METALLURGY AND HEAT TREATMENT
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Abstract

This work is devoted to the fabrication of heterophase powder and consolidated ceramics based on hafnium and molybdenum borides and silicides by combining self-propagating high-temperature synthesis (SHS) and hot pressing (HP). Composite ceramic HfB2–HfSi2–MoSi2 SHS powders are fabricated according to the magnesium-thermal reduction flowsheet from oxide raw materials, in which the combustion wave has temperatures of 1750–2119 K and rather high mss combustion rates of 8.4–9.3 g/s. The structure of synthesized SHS powders consists of relative coarse MoSi2 grains up to 10 μm in size, submicron elongated HfB2 grains mainly located inside the MoSi2 grains, and rounded Si precipitates. The composition with a lower boron concentration contains numerous polyhedral HfSi2 grains smaller than 10 μm in size. The resulting powders have an average particle size of ~6 μm with a maximal size up to 26 μm. The phase compositions of the ceramics consolidated by the HP method and synthesized SHS powders are identical. The microstructure of compact samples consists of faceted elongated HfB2 grains 0.5–10.0 μm in size, polyhedral HfSi2 and MoSi2 grains up to 8–10 μm in size, and silicon interlayers. The consolidated ceramics have a high structural and chemical homogeneity, low residual porosity of 1.1–1.7%, high hardness of 11.7–12.6 GPa, and thermal conductivity of 62–87 W/(m K).

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ACKNOWLEDGMENTS

This study was supported by the Russian Scientific Foundation, project no. 19-19-00117.

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Authors and Affiliations

  1. National University of Science and Technology “MISiS”, 119049, Moscow, Russia

    Yu. S. Pogozhev, M. V. Lemesheva, A. Yu. Potanin, S. I. Rupasov & E. A. Levashov

  2. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    V. I. Vershinnikov

Authors
  1. Yu. S. Pogozhev
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  2. M. V. Lemesheva
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  3. A. Yu. Potanin
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  4. S. I. Rupasov
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  6. E. A. Levashov
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Correspondence to Yu. S. Pogozhev, M. V. Lemesheva, A. Yu. Potanin, S. I. Rupasov, V. I. Vershinnikov or E. A. Levashov.

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Translated by N. Korovin

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Pogozhev, Y.S., Lemesheva, M.V., Potanin, A.Y. et al. Heretophase Ceramics in the Hf–Si–Mo–B System Fabricated by the Combination of SHS and Hot Pressing Methods. Russ. J. Non-ferrous Metals 60, 380–389 (2019). https://doi.org/10.3103/S1067821219040102

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