Optimization of the Sintering Process of Electroerosion Dispersed Particles of the KNT16 Alloy

The purpose. Optimization of the sintering process of the electroerosion charge obtained by the method of dispersing waste of a tungsten-free hard alloy of the KNT16 brand, as well as the study of the composition, structure and properties of the new alloy obtained under optimal sintering conditions.

Methods. To obtain a new experimental tungsten-free hard alloy, an electroerosive charge was used, obtained by dispersing the waste of the alloy of the KNT16 brand. The consolidation of electroerosive particles was carried out using the Thermal Technology Spark Plasma Sintering system Model 25-10 (SPS 25-10). Determination of optimal parameters (optimization) of the consolidation process of the new alloy by the microhardness of sintered samples was carried out by setting up a complete factor experiment (PFE) type 23. As factors influencing the sintering process, such parameters of the SPS 25-10 installation as temperature, pressure and holding time were chosen.

Results.. In the course of the study it was found that: limit value of the optimization parameter Y (microhardness) were: 1415 HV at T = 1200°C, P = 40 MPa and t = 5 min; the new structure of the solid alloy is uniform throughout the volume, from the analysis of the microstructure shows the absence of defects such as cracks and pores chain; BVTS made on the basis of electroerosion dispersed particles of the KNT16 alloy in an oxygen-containing liquid (distilled water) contain part of oxygen. It is also established that the main elements in these new alloys are Ti, Ni and Mo; the process of EED 

of the KNT16 alloy in distilled water leads to the formation of such phases as TiC, MoNi₃, Ni₂O₃, Ni and Mo in the new experimental BVTS; the microhardness index of sintered samples by the method of SPS synthesis of electroerosion dispersed particles of BVTS brand KNT16 obtained in distilled water is 1415 HV, which corresponds to the calculated data of the optimization process.

Conclusion. The results obtained allow us to conclude that the consolidation of the electroerosion charge obtained by dispersing the waste of a tungsten-free hard alloy into a new alloy is most optimally carried out at the following parameters of the SPS synthesis system 25-10: T = 1200 ° C, P = 40 MPa and t = 5 min, which is confirmed by the results of optimization and research of the composition, structure and properties of a new experimental tungsten-free hard alloy.

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