Structure and properties of finely dispersed Cobalt powder from Cobalt metal waste of the K1Au brand

   Purpose. Investigation of the relationships between the composition, structure and properties of the initial Cobalt metal waste and the powder obtained by crushing these wastes by electric erosion in liquid dielectrics.

   Methods. Finely dispersed powder from Cobalt metal waste of the K1Au brand was obtained on an original patented installation in a liquid dielectric medium - distilled water by electric erosion. The pieces of the metal tube were loaded into a reactor filled with a working fluid, and a pulse voltage from a pulse generator was applied through electrodes made of the same metal tube. When the energy was reached to penetrate the liquid dielectric, electrical discharges occurred between the pieces of metal waste to form powder microparticles, which were further investigated by various methods to determine their granulometric, chemical, and phase compositions using modern research equipment.

   Results. It was found that the resulting electroerosive Cobalt powder has dimensions ranging from 0.45 microns to 38.72 microns and contains oxygen on the surface. The phase analysis showed the presence of only one phase in the particles of electroerosive cobalt powder – the Cobalt phase. From the analysis of the particle shape and morphology, it was found that the obtained parts mostly have the shape of a sphere with an average size of 8.6 microns and lumps of agglomerates consisting of finely dispersed particles.

   Conclusion. The obtained research results can be used to develop a new hard alloy using waste materials of expensive cobalt raw materials by the method of electroerosion dispersion with subsequent improvement and optimization of the composition and structure of the alloy.

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