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Hot-pressed ceramic SiC–YAG materials

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Inorganic Materials Aims and scope

Abstract

Dense SiC-based ceramic materials containing yttrium aluminum garnet (YAG) as an oxide sintering aid have been prepared by hot pressing in the temperature range 1750–1850°C. As a result of melting, the oxides fill spaces between the SiC particles, contributing to the densification of the material and mass transport during the hot pressing process. The present results demonstrate that relatively small amounts of the oxides (≤5 wt %) are needed to ensure a high degree of densification of the SiC–YAG materials. The best physicomechanical properties are offered by the SiC + 3 wt % YAG material sintered at a temperature of 1850°C: ρ = 3.24 ± 0.01 g/cm3, П = 1.1 ± 0.1%, σb = 640 ± 10 MPa; KIc = 6.4 ± 0.2 MPa m1/2, Еel = 410 ± 20 GPa, and HV = 26.0 ± 0.2 GPa. This material experiences predominantly intercrystalline fracture.

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Authors and Affiliations

  1. Central Research Institute of Materials, Paradnaya ul. 8, St. Petersburg, 191014, Russia

    S. N. Perevislov

  2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia

    A. S. Lysenkov & D. D. Titov

  3. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    M. V. Tomkovich

Authors
  1. S. N. Perevislov
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  2. A. S. Lysenkov
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  3. D. D. Titov
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  4. M. V. Tomkovich
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Correspondence to S. N. Perevislov.

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Original Russian Text © S.N. Perevislov, A.S. Lysenkov, D.D. Titov, M.V. Tomkovich, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 2, pp. 206–211.

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Perevislov, S.N., Lysenkov, A.S., Titov, D.D. et al. Hot-pressed ceramic SiC–YAG materials. Inorg Mater 53, 220–225 (2017). https://doi.org/10.1134/S0020168517020091

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  • DOI: https://doi.org/10.1134/S0020168517020091

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