Structure Formation and Tribological Properties of Mo-Si-B-Hf Electrospark Coatings Based on Mo2Ni3Si Laves Phase

Evgenia Igorevna Zamulaeva; Alexander Nikolaevich Sheveyko; Yuri Yurievich Kaplanskii; Evgeny Alexandrovich Levashov

doi:10.3390/ma15165613

Structure Formation and Tribological Properties of Mo-Si-B-Hf Electrospark Coatings Based on Mo₂Ni₃Si Laves Phase

Materials (Basel). 2022 Aug 16;15(16):5613. doi: 10.3390/ma15165613.

Authors

Evgenia Igorevna Zamulaeva¹, Alexander Nikolaevich Sheveyko¹, Yuri Yurievich Kaplanskii¹, Evgeny Alexandrovich Levashov¹

Affiliation

¹ Scientific-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.

Keywords: Laves phase; electrospark deposition; friction and wear; in situ TEM; molybdenum silicides; structural transformations.

Grants and funding

This work was carried out with financial support from the Russian Science Foundation (Agreement No. 19-19-00117) as part of a high-temperature coatings investigation and from the Ministry of Science and Higher Education of the Russian Federation under the state assignment (project No. 0718-2020-0034) in part of HRTEM.