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Structure Formation and Tribological Properties of Mo-Si-B-Hf Electrospark Coatings Based on Mo2Ni3Si Laves Phase
Evgenia Igorevna Zamulaeva1, Alexander Nikolaevich Sheveyko1, Yuri Yurievich Kaplanskii1
1Scientific-Educational Center of SHS, National University of Science and Technology "MISiS", Leninsky Prospect 4, 164, Moscow 119049, Russia.
Abstract:
Coatings were produced on the EP741NP nickel alloy substrates by electrospark deposition (ESD) in argon using an MoSi2-MoB-HfB2 electrode. In situ high-resolution transmission electron microscopy and X-ray diffraction analysis studies have identified the temperature above which the strengthening Mo2Ni3Si Laves phase is formed in the coatings. At 25 °C, the coatings with a predominant content of the Laves phase are characterized by enhanced wear resistance, as well as a lower coefficient of friction compared to the non-annealed coatings containing binary silicides. At 700 °C, the EP741NP substrate was characterized by the lowest friction coefficient (Ktr = 0.35), and its wear was approximately at the same level as the wear of both coatings.
