High-dispersed composite powders of Fe-Pt and Fe-Au with the designed properties are prepared by thermochemical reduction of oxalates. The regularities of structure and properties forming the powders are investigated. The powders have different nature of particle surface, magnetic and adsorption characteristics as applied in the medical purposes. It is shown that the powders are corrosion-resistant, monodispersed and non-pyrophoric as well as possess a hydrophile surface.
CHAUS A.S., MURGASH M.
Structure of high-speed steel, formed in stage of primary crystallization, determines final properties of cast metal-cutting tool after its complete heat treatment. Process of primary crystallization of high-speed steel in magnetic field has been investigated by method of differential thermal analysis. It has been shown that under conditions of action of magnetic field, all reactions describing the process of primary crystallization of high-speed steel occur in other temperature range and with characteristic particularities reflecting the varying the phase transformation kinetics.
PASHINSKAYA E.G., PASHINSKIJ V.V.
Action of weak pulsed magnetic field on formation of macrostructure and microstructure of cast alloy based on Cu-Sn has been studied. Essential influence of conditions of heating and cooling the material on efficiency of high-temperature treatment with weak magnetic field pulses has been shown. Influence of conditions of treatment with weak magnetic field pulses on variations of alloy structure and properties has been shown. Optimal parameters of treatment have been determined. It is reckoned that this method is based on local absorption of energy of pulses of weak magnetic field by structural non-uniformities.