X-RAY CRYSTALLOGRAPHY OF SINTERED TUNGSTEN-CONTAINING PRODUCTS OBTAINED BY SPARK PLASMA SINTERING OF ELECTROSPARK POWDERS
One of the promising methods for obtaining powder from tungsten-containing waste, characterized by relatively low energy costs and ecological purity of the process, is the method of electrospark dispergation. To develop a technology for obtaining sintered products from electrospark powders produced using the method of spark plasma sintering, complex investigations of the composition, structure and properties of sintered materials are required. The purpose of this work was to perform X-ray analysis of sintered tungsten-containing items obtained by spark plasma sintering of electrospark powders. In the experiments on the production of tungsten-containing nanocomposite sintered products, composition of powders which is a mixture of powders obtained by electrospark dispergation of R6M5 steel waste, hard alloy VK8 in a ratio of 30% to 70% obtained in illuminating kerosene was used as powder material. The powders are consolidated by the method of spark plasma sintering using the system of spark plasma sintering SPS 25-10. The advantages of the technology of spark plasma sintering are: uniform distribution of heat over the sample; high density or controlled porosity; bonding materials are not required; uniform sintering of homogeneous and heterogeneous materials; short cycle time; the production of a part immediately in the final form and the obtaining of a profile close to the set one. The phase composition of the sample was studied by X-ray diffraction using a Rigaku Ultima IV diffractometer in Cu-Kα radiation (wavelength λ = 0.154178 nm) using Soller slits. Based on the performed X-ray diffraction analysis of the sample obtained by spark plasma sintering, it was found that the main phases of the sintered item are WC, WC<sub>3</sub>, Co<sub>3</sub>Fe<sub>7</sub>, and C.