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  • Investigation of the Struct...
    Haponova, Oksana; Tarelnyk, Viacheslav; Mościcki, Tomasz; Tarelnyk, Nataliia; Półrolniczak, Joanna; Myslyvchenko, Oleksandr; Adamczyk-Cieślak, Bogusława; Sulej-Chojnacka, Joanna

    Coatings (Basel), 05/2024, Letnik: 14, Številka: 5
    Journal Article

    Electrospark coatings alloyed with MoSsub.2 have been studied. The coatings were obtained by the following two strategies: the first consisted of pre-applying molybdenum disulfide to the treated surface and alloying with a molybdenum electrode (Mo + MoSsub.2 coating); the second consisted of applying a paste with a sulfur content of 33.3% to the treated surface and alloying with a molybdenum electrode (Mo + S coating). The structure, phase composition, and tribological properties of the coatings were investigated. The coatings have a complex structure consisting of an upper soft layer, a hardened white layer, a diffusion zone, and a substrate. Element analysis and cross-sectional hardness changes indicated that element diffusion occurred at the coating/substrate interface. The phase composition of the coatings is represented by BCC and FCC solid solutions on Fe, and MoSsub.2 is also detected. In Mo + S coatings, the molybdenum disulfide on the surface is about 8%; in Mo + MoSsub.2 coatings, it is 27%–46%. The obtained coatings show very good tribological properties compared to molybdenum ESA coatings. The frictional forces and coefficients are reduced by a factor of 10 and 40, depending on the test conditions.