Recommended application field: Electroenergineering (tlectromotors, generators and pumps for liquid gases pumping, fault current limiters), magnetic transport (MAGLEV), fly-wheel energy storage systems.

Advantages over analogues: Scientific and technological approachto development of bulk materials using magnesium diboride is based on synthesis in high pressure conditions. Improved magnetic properties are to be obtained due to hogh material density, nano-dimensional defects and chemical doping. Special attention will be paid to technological basis of synthesis of bulk blocs with typical dimensions up to 50 mm and further selection of samples with equal parameters by frozen magnetic field estimation and measuring of the levitation force. Developed magnesium diboride based superconducting nanostructural materials should have high level of critical current density at 20 Kjc>=1000-100 kA/cm[2] in the fields 3-4 T, field of irreversibility, Hin>=8 T, trapped magnetic field , B>=2T for the samples 30-50 mm in diameter, microhardness, Hv>=15 GPa at P=4,9 N, fracture toughness, k1c>= 7MPaxm[1/2], Young modulus, E>=220GPa and density close to the theoretical one.One of the advantages of superconductive motors, generators and pumps is high power density due to a small size of rotor that allows an essential decrease in size (by 5-8 times) and weight, as achieving of high dynamics: a High angle acceleration which is especially important when a device operates under the conditions of high reverse frequency. The use of superconductive electrical machines seves energy resources. Andvancement in applications of the second-type superconductors in tlectrical machines is closely related to materials improvement, because in operation they should provide high currents in magnetic fields and temperature variations during heating-cooling processes.

The development stage readiness: tested in laboratory condition

Description of the development:
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The aim of presented project is formation of magnesium diboride based superconducting nanostructural materials with high level of critical current density, jc, field jf irreversibility, Hin, trapped magnetic field, B, microhardness, Hv, facture toughness, klc, Young modulus, E, and densityclise to the theoretical one. Such materials will be effective for application in the cryogenic electrical machines (electric motors, pumps) working at the liquid hydrogen temperature (20 K). The increase of jc and B we plan to reach using high pressure-high temperature synthesis and alloying. in the frame of the project an electromotor will be constructed based on the best of developed materials and its efficiency wil be estimated. The magnesium diboride based superconductive blocks for the elements of the electromotor rotor will be produced by high pressure-high temperature synthesis. Modern technological progress is aimed at subsititution of fuel for aircraftsand combustion engines of autotransport and watertranport (submarines) by hydrogen, at the development of electrical power networks (first of all on the territoryof the USA) by which the electrical power should be transmited to big distances through the superconductive cables at the liquid hydrogen temperature and using liquid hydrogen as coolingagent. These directions caused great interest to electric machines working at the liquid hydrogen temperature. Superconductive electromotors and pumps for liquid hydrogen pumping will be in great demand when new technologies utilizing liquid hydrogen are introduced: they are more effective than traditional ones due to essentially smalier weight, considerably higher speed of operation in the reversion regime and higher specific output power on the rotor surface.

Information about newness of the development:
there are Ukrainian patents -- 2 items

corresponds technical description
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Possibility of transfer abroad:
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Country Ukraine

For additional information turn to:
E-mail: gal@uintei.kiev.ua