Gulyaeva T. The determination of the rational alloying and sintering modes of the sparingly-doped and rapidly cooled alloys Nd-Fe-B-Ti-C-Cu to enhance the magnetic characteristics.

The object of study: the processes of structure formation in the rapid cooling, the kinetics of phase formation with Limited metastability of Nd2Fe14C, NdCu2, Nd2Fe14B under high pressure; structural and phase transformations that take place in alloys of Nd-Fe- (C, B) at isothermal annealing; mechanism of formation of high-coercivity state in the sintered compacts based on the phases and Nd2Fe14C Nd2Fe14В. Subject of study: the nature of influence of external pressure, doping by titanium and copper, heat of treatment on structural-phase transitions and magnetic properties of sintered compacts and Bonded magnets of Nd-Fe- (B, C). Objective: the solution of scientific and technical problems of increasing the magnetic characteristics, the establishing of nature of structural phase transitions in sintered compacts of Nd-Fe- (B, C) during doping Ti and Cu and at sintering under external pressure for reducing the cost of finished products and for ensuring of maximum rigidity of the damper by selecting a material with optimum magnetic properties. Methods of reseach: X-ray: using of "Dron-3" diffractometer in the filtered Co-K? Radiation were obtained diffraction patterns, that allowed to identify the presence of phases, lattice parameters, the volume of the unit cell of the crystal lattice phase; Metallographic: using an optical microscope OLIMPYS IX-70 and a scanning electron microscope JEOL JSM-6360LA the ends of films and the sintered samples were studied; microanalysis: using a scanning electron microscope JEOL JSM-6360LA the pictures of surface microstructure of thin films ends and sintered samples were obtained; using the method of energy-dispersive secondary reflected electrons the distribution of chemical elements on the surface was obtained, by microanalysis at local points the chemical composition of phases was established; magnetometric: using a vibrating magnetometer the loops of magnetization and demagnetization were built, using the method of gisterezimetra the coercive force Hc and a residual induction Br by demagnetizing part of the hysteresis loop were determined. The results obtained - using sparingly doped alloys Nd-Fe- (B, C) allows to obtain high-energy miniature law-cost magnets; studies of states structure, phase composition and magnetic properties of rapidly cooled alloys in the initial and annealed able to significantly reduce the time of heat treatment, which simplifies the process of making permanent magnets based on phase Nd2Fe14C; A design with a fan shaft and a magnetic damper analysis of magnetic materials that can be used in the damper on the basis of structural features; shows that this design does not require the support of the traditional summing oil for cooling the bearing and is devoid of the typical shortcomings mezhvalnyh supports. Introduced on LLC "Polus-N", Kharkov and SE "Ivchenko-Progress". Scope - mechanical engineering and electrical engineering.