GEOMETRIC CHARACTERISTICS, COMPOSITION AND STRUCTURE OF COATINGS OF WC-TIB2-B4C- NI-CR-B-SI-C ELECTRODES FORMED ON 3D PRINTING TITANIUM AND STEELS BY CONTACTLESS ELECTROSPARK DEPOSITION
G. Kostadinov, T. Penyashki, A. Nikolov, R. Dimitrova, V. Kamburov, M. I. Petrzhik, B. Elenov, I. Mortev, E. Dimitrova
Pages: 160-171
Published: 16 Nov 2022
Views: 256
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Abstract: The object of the present work are the surface properties of technical titanium produced by 3D printing - Direct Metal Laser Sintering (DMLS) with subsequent treatment by local electrospark deposition with a rotating electrode (LESD). The layering was performed with electrodes of multicomponent hard alloys based on WC with additives from B4C, TiB2 and Ni-Cr-B-Si-C and of AlSi alloys. The influence of the LESD process parameters on the roughness, thickness, composition and structure of the coatings was studied by profilometric, metallographic, XRD, SEM and EDS methods. High-density coatings with different roughness and thickness have been obtained, which can be changed by changing the LESD modes in the range Ra=1.25÷3.5μm, δ=6÷20μm and microhardness 9÷14.0 GPa. Friction tests have shown that the wear of coated surfaces is up to 4 times lower than uncoated. On the basis of the experimental data, appropriate process parameters and electrodes have been determined, allowing to obtain coatings with purposeful synthesized of new phases and crystal-amorphous structures, and with predetermined thickness and roughness and higher hardness, and wear resistance than those of substrates.
Keywords: 3d printing, direct metal laser sintering dmls, local electrospark deposition - lesd, titanium alloys, roughness, microhardness, wear, wear resistance
Cite this article: G. Kostadinov, T. Penyashki, A. Nikolov, R. Dimitrova, V. Kamburov, M. I. Petrzhik, B. Elenov, I. Mortev, E. Dimitrova. GEOMETRIC CHARACTERISTICS, COMPOSITION AND STRUCTURE OF COATINGS OF WC-TIB2-B4C- NI-CR-B-SI-C ELECTRODES FORMED ON 3D PRINTING TITANIUM AND STEELS BY CONTACTLESS ELECTROSPARK DEPOSITION. Journal of International Scientific Publications: Materials, Methods & Technologies 16, 160-171 (2022). https://www.scientific-publications.net/en/article/1002518/
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