Comparative Analysis of the Process of Obtaining a Charge for a Tungsten-Free CST Hard Alloy by Means of Electroerosive Dispersion in Carbon-and oxygen-containing Working Fluids

The purpose. A comparative analysis of the cost of electricity for a charge by the method of electroerosion dispersion for the production of hard alloy, and the comparison of physical and mechanical properties obtained EDM powder materials, and alloy of them.

Methods. To obtain experimental powder materials (charge), an installation for producing nanodisperse powders from conductive materials (patent RU 2449859), waste of a tungsten - free hard alloy of the KNT16 brand (GOST 2653085), working fluids carbon - (ethyl alcohol, GOST 26530-85) and oxygen-containing (distilled water GOST 6709-72) were used.

Using a scanning electron microscope "QUANTA 600 FEG", the morphology of an experimental electroerosive powder material of the KNT16 alloy was studied.

The elemental composition of the resulting powder material was studied by electroerosion of the KNT16 alloy using an energy-dispersion X-ray analyzer manufactured by EDAX.

The size distribution of microparticles of the experimental electroerosive powder material of the KNT16 alloy is determined.

Results. In the course of the study, it was found that: when dispersed in a carbon-containing working fluid, the energy costs are lower compared to the oxygen-containing one; the particles of the powder material obtained during the experiment have a predominantly spherical and elliptical shape; the main chemical elements of the charge obtained in ethyl alcohol are: Ti (66.1%); Ni (20.02 %); C (7.41 %); Mo (6.47 %); the average particle size of the powder material obtained by electroerosion was 18.69 microns.

Conclusion. The results obtained allow us to conclude that the dispersion by electroerosion of a tungsten-free hard alloy of the KNT16 brand in a carbon-containing working fluid of ethyl alcohol is less energy-consuming compared to the same process occurring in an oxygen-containing working medium of distilled water. According to the presented results of morphological studies, elemental and dimensional analysis, it can be concluded that the charge obtained during the experiment is suitable for obtaining sintered samples and their further study.

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