Self-Propagating High-Temperature Synthesis Pressing of Composites Based on the TiB2–B4C–Al System

• Published in: Inorganic materials 2022-05, Vol.58 (5), p.525-530
• Main Authors: Bogatov, Yu. V., Shcherbakov, V. A., Sychev, A. E.
• Format: Article
• Language: English
• Subjects: Additives; Aluminum; Bend strength; Boron carbide; Cermets; Chemistry; Chemistry and Materials Science; Combustion temperature; Compressive strength; Diameters; Exothermic reactions; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials Science; Melting points; Microhardness; Mixtures; Particulate composites; Self propagating high temperature synthesis; Titanium diboride
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168522050016

— Using forced self-propagating high-temperature synthesis compaction, we have produced metal–ceramic composites based on the TiB 2 –B 4 C–Al system. In our preparations, we used reaction mixtures consisting of Ti, B, B 4 C, and Al powders. The fraction of Al in the composites was 10 wt %, and B 4 C content was varied from 20 to 40 wt %. Ti + 2B exothermic synthesis reaction ensured interaction in the combustion regime. The use of Al and B 4 C as functional additives has made it possible to obtain 58-mm-diameter consolidated metal–ceramic samples ranging in density from 3.3 to 3.7 g/cm 3 . The boron carbide particles in the composites have been shown to retain their original shape and properties during the synthesis process because the combustion temperature of all the reaction mixtures (1500 to 2050°C) did not exceed the melting point of B 4 C. We have measured the bending and compressive strength of the composites and the microhardness of individual phases in their composition.