The peculiarities of high-pressure synthesis of highly dense nanostructural MgB2-based superconductive materials, of thermobaric treatment of MT–YBCO (melt-textured YBa2Cu3O7–d-
based superconductor), high- ressure sintering of YBa2Cu3O7–d, oxygenation of MT–YBCO under
high isostatic pressure of oxygen and processes of formation of superconductive junctions between
MT-YBCO blocks are considered. The attained level of superconductive and mechanical properties of such materials and junctions make them promising for application in cryogenic devices working on the principle of levitation: electricmotors, generators, pumps for liquid-gas transfer, magnetic
bearings, flywheels, fault current limiters, maglev transport, etc. High-pressure synthesized MgB2 (with Ti additions) blocks were for the first time tried in the superconductive electricmotor at 20 K and demonstrated an efficiency similar to MT–YBCO (at the same working temperature).PACS: 74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds) 85.70.Rp - Magnetic levitation, propulsion and control devices (for superconducting-magnetic levitation devices, see 84.71.Ba)
Key words: high-pressure synthesis, sintering and treatment, superconductive junction, cryogenic device.