There is a growing need for the development of new ultra-high temperature ceramics (UHTC) that are multipurpose, deformation-resistant, and able to act as special protection for engines and vehicles. These ceramics are also required for segmented leading-edge components in aerospace, plasma-facing, and ceramic parts for solar towers used in gas turbine operations in combined cycle power plants (such as grids, superheaters, reheaters, evaporators, steam turbines, condensers, and chimneys). This has led to a worldwide demand for a new class of ceramic composites that exhibit incredible strength and a sufficient balance between high toughness, hardness, and high modulus. Dr. Oleg Vasylkiv is currently conducting research in the fields of chemical and structural engineering related to deformation-resistant carbides, borides, and nitrides of Me (IV-V) ceramic composites. These composites are known to exhibit superior hardness, toughness, and flexural strength even at high temperatures of up to 2000°C. In addition to this, Dr. Vasylkiv is also studying the mechanisms of high-temperature (HT) flexural strengthening and HT ductility, which involves a change in the deformation mechanism from brittle fracture to plastic deformation, of typically brittle transition metals carbides, borides, and nitrides. Important studies: (1) Ultra-high temperature flexure and strain-driven amorphization in bulk polycrystalline boron carbide. At temperatures above 2000 °C, boron carbide showed an ultrahigh flexural strength exceeding 1.8 GPa, accompanied by a change in the deformation mechanism from brittle fracture to plastic deformation. The amorphization occurs inside the severely deformed grains. The results at 2000 °C suggest that the magnitude of the tensile stresses imposed on the B4C grains during deformation in flexure and the total strain transferred to a ceramic during the deformation process play the dominant role in the crystalline-amorphous transformation. (2) Formation of a Zr-Ta multiboride ceramic composite with an artificially created hierarchical superstructure via reaction-driven consolidation of ZrB2, Ta, and amorphous B powders. Formation of a highly reproducible repetitive superstructure where Ta3B4 forms a chain-like mesh that entraps the ZrB2, ZrB, TaB, and (Zr, Ta)B2 phases. Due to the formation of the (Zr, Ta)B2 solid solution multiboride ceramic composite exhibited ultra-hardness of 28.6±3.2 GPa at 98 N and 22.6±0.6 GPa at 196 N, and the flexural strength 400 MPa up to 2000 °C. (3) Bulk boron prepared by SPS of amorphous β-boron powder. It showed a steady increase in strength up to 1200 °C, which is 0.66 of the absolute melting point for boron. Despite showing clear signs of plastic deformation on the strain-stress curves, the yield strength of the monolithic boron ceramic exceeds 1.2 GPa at 1200 °C, which surpasses the data currently available for boron carbide bulks. (4) Deformation-resistant Ta0.2Hf0.8C solid-solution ceramic with superior flexural strength at 2000°C. we explored the consolidation, solid-solution formation, and high-temperature properties of tantalum hafnium carbide with the 1 TaC:4 HfC ratio, that is, Ta0.2Hf0.8C. Tantalum hafnium carbide bulks can be consolidated using spark-plasma sintering only at temperatures exceeding 2200°C. Based on the three-point flexural tests, it was observed that the toughness and strength of Ta0.2Hf0.8C remained high at 2000°C (3.4 ± 0.4 MPa m1/2, 500 ± 20 MPa). At 2000°C, the majority of carbides show a plastic behavior, but the strain-stress curves of the SPSed Ta0.2Hf0.8C ceramic were linear. (5) Consolidation and high-temperature strength of monolithic lanthanum hexaboride. Rare-earth hexaborides are excellent thermionic electron-emitter materials. Among all the binary ceramic compounds ever fabricated, LaB6 shows the best figure of merit as a thermionic emission material. LaB6 was determined to have many advantageous properties, including a low electron work function and good chemical resistance. In this study, we explored the densification, microstructure evolution, and high-temperature properties of bulk lanthanum hexaboride. (6) Ternary single-phase high-entropy Ta, Zr, Nb carbide was obtained using reaction driven-ECAST. The flexural strength of Ta, Zr, Nb carbide showed a peak strength at 1600 °C. B4C-TaB2 eutectic composites, high-strength TiB2-TaC, SiC–NbB2, TiB2-NbC UHT ceramics. (7) Flash-SPS of ultrafine yttria-stabilized zirconia and silicon carbide bulks. (8) Nanoexplosion synthesis of multimetal oxide ceramic nanopowders. Nano-engineering of zirconia-noble metals composites. Nanoreactor engineering and SPS densification of multimetal oxide ceramic nanopowders. (9) Synthesis of iron oxide nanoparticles with different morphologies by precipitation method with and without chitosan addition and magnetic properties of self-assembled magnetite-chitosan nanostructures. (10) Tough yttria-stabilized zirconia nanoceramic by low-temperature SPS. High-toughness tetragonal zirconia and zirconia/alumina nano-ceramics. Tough yttria-stabilized zirconia nanoceramic by low-temperature pressureless consolidation.