Porous preforms of B4C + C and B4C + C + Si materials were impregnated by liquid (molten) silicon to obtain high-density product with a relative density of 99.0 % and porosity of 0.9%. Silicon impregnation was carried out by saturating the samples through the pores of the SiC + C sacrificial preforms. This method allows to reduce both the dissolution of boron carbide grains in the silicon solution and the formation of the B12(C, Si, B)3 phase. This reduces the fragility of the product and thereby improves the mechanical characteristics of the B4C ceramics.
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The study was carried out with the financial support of the Russian Foundation for Basic Research, project No. 17-03-00863\17.
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Translated from Novye Ogneupory, No. 1, pp. 33 – 37, January 2018.
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Perevislov, S.N., Shcherbak, P.V. & Tomkovich, M.V. High Density Boron Carbide Ceramics. Refract Ind Ceram 59, 32–36 (2018). https://doi.org/10.1007/s11148-018-0178-4
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DOI: https://doi.org/10.1007/s11148-018-0178-4