ANALYSIS OF THE CHARACTERISTICS OF SINTERED PRODUCTS MADE OF CHROMIUM-CONTAINING ELECTROEROSIVE POWDERS

The article presents the results of the analysis of the characteristics of sintered products made of chromium-containing electroerosive powders. One of the main directions of the development of mechanical engineering technology at present is the improvement of existing and the development of new waste-free, environmentally friendly, material-saving production processes. Powder metallurgy plays a certain role in solving this problem. In recent years, much attention has been paid to the development of methods for the manufacture of high-density powder materials For the implementation of the planned studies, waste chromium-containing steels SHX15 and H13 have been selected. Powder materials were obtained by electrical erosion at the electro-erosive dispersion unit developed by the authors. Butyl alcohol was chosen as the working medium of dispersion. The powder was consolidated by the spark plasma sintering method using the spark plasma sintering system SPS 25-10 (Thermal Technology, USA). It is established that the microhardness of the sintered steel sample SHH15 is equal to 154 HV. The microhardness of the sintered steel sample H13 is equal to 461 HV. It was found that the porosity of the sintered steel sample H13 is equal to 3.34 %, and also that 95 % of the pores have a size of up to 2 microns. The porosity of the sintered steel sample SHH15 is 1.72 %, and also that 90 % of the pores have a size of up to 1 microns. According to the results of the research, it was found that the microhardness of the sintered sample made of steel SHH15 is lower than that of the sample made of steel H13. The porosity of a sample made of steel SHH15 is lower than that of a sample made of steel H13. Therefore, it can be concluded that sintered products made of powder material sta-li H13 have a harder surface and can be used in the production of small loaded parts.

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