Bratanich T. Bratanich T.I. Structural mechanisms of decomposition and destruction of intermetallics during interaction with hydrogen and synthesis of functional nanostructural composites on titanium hydride base

The thesis is devoted to determination of structural mechanisms of decomposition and destruction of intermetallics during their interaction with hydrogen according to reactions of direct and destructive hydrogenation. It is also devoted to the synthesis of titanium hydride - based functional nanostructural composites with advanced properties by the destructive hydrogenation of the titanium - contained intermetallics. It was shown that structure-phase mechanism of destructive hydrogenation of titanium-based intermetallics consists in initiated by hydrogen chemical destruction of initial intermetallics and in formation of new phases: titanium hydride and titanium-depleted intermetallics. The functional nanostructural composites on the base of titanium hydride have been synthesized by intermetallics destructive hydrogenation for reversible hydrogen accumulation in the cycles of destructive hydrogenation - recombination and manufacturing of detonation coatings with improved mechanical properties. The mechanism of LaNi5-xAlx intermetallics chemical destruction during hydrogenation in CO and CO2 media presence has been determined. It consists in oxidation of intermetallics and their components. Method of mechanical-catalytic activation of intermetallics hydrogenation under conditions of concurrence with oxidation processes was proposed. Nonvolatile nonporous composites on titanium hydride base with 2-3 times increased hydrogen capacity as compared with initial intermetallics were synthesized at the TiNi and TiCu destructive hydrogenation. It was developed the hydride accumulator of hydrogen on the base of 43 % mass. TiH2 - 57% mass. Cu nonvolatile composite with double hydrogen capacity as compared with accumulators on the base of TiFe powder and nonvolatile composite containing 43 % mass. TiFe - 57 % mass. Cu obtained by powder metallurgy method.