A new approach to the homogenization of the reaction mixture is presented consisting in the creation of glass-ceramic precursors in oxide systems containing enough components for the joint synthesis of carbides and borides mixed at the molecular level. By the joint carbothermal reduction of glass-ceramic precursors in vacuum at 1600 °C fine mixtures in B4C–SiC–MB2 systems (M—Ti, Cr, Zr) without or with an insignificant content of impurities were obtained. Due to the good solubility of titania in the silicate-borate melt the microstructure of the ternary B4 C–SiC–TiB2 sample is represented by boron carbide crystals up to 1 μm in size surrounded by nanoparticles of 30 – 40 nm.
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The study was carried out with the financial support of the Russian Foundation for Basic Research within the framework of scientific projects No. 18-33-01281 and No. 18-53-18014 using the equipment of the SPbGTI (TU) Engineering Center.
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Translated from Novye Ogneupory, No. 2, pp. 46 – 51, February 2020.
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Kotsar, T.V., Danilovich, D.P. & Ordan’yan, S.S. Glass-Ceramic Precursors in B2O3–SiO2–MxOy Systems (M — Ti, Zr, Cr) as a Source for Producing Fine-Dispersed Mixtures of High-Melting Carbides and Borides. Refract Ind Ceram 61, 100–105 (2020). https://doi.org/10.1007/s11148-020-00438-8
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DOI: https://doi.org/10.1007/s11148-020-00438-8