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in the amount of 2 and 5 wt.%, respectively). It is established that the maximal strength (445 MPa) is characteristic of the material B 13 C 2 over the whole temperature range. It does not change up to 1600°C. The increase in strength of B 4 C-based samples is revealed over the range of 1200 to 1600°C, mainly for high-porous materials (10-12%). Presumably, this is due to the higher relaxation properties of porous material microstructure.Developing high-density materials based on compounds with covalent bonds and studying their structureformation, strength, and degradation mechanisms in different loading conditions are the most important tasks of ceramic materials science. Of great interest among engineering ceramics are monophase materials and composites based on boron carbides (B 4 C, B 13 C 2 ) that may be used to fabricate light armor, in nuclear reactors, and under strong abrasion at

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