Research of Tribotechnical Сharacteristics of Innovative Wear-Resistant Coatings for High-Speed Machining

The purpose of the work is to increase the efficiency of high-speed blade cutting of heat-resistant alloys based on improving the tribotechnical characteristics of wear-resistant coatings by developing and introducing multicomponent cathodes — targets from sintered high-entropy alloys when applied by the magnetron method.
At the preliminary stage, the composition of the powder material was selected; technologies for obtaining high-entropy target cathodes (with a diameter of 20 mm and 70 mm) obtained by high-temperature spark plasma sintering have been developed; control of their parameters is provided: density, grain-size analysis, electrical conductivity, hardness and crack resistance. The morphology of the sintered samples was examined by scanning electron microscopy and non-dispersive analysis. Technological equipment for magnetron coating system in various gas media is manufactured. Tribotechnical tests were carried out on tribometers and during blade cutting of various grades of steels and alloys, based on the results of which the most effective compositions of multilayer composite nanostructured high-entropy wear-resistant coatings were determined, in particular Al20Ti20Zr15V15Cr15Nb15 and Al20Hf10Ni15Ti25W10Zr20, providing improved cutting performance of chromium-nickel alloys EI654 and EI698 VD.
Comparative tests of commercially used wear-resistant coatings and coatings made of high-entropy target cathodes were carried out: Al20Hf10Ni15Ti25W10Zr20; Al20Ti20Zr15V15Cr15Nb15; Al20Hf15V15Cr15Ti15Ta10W10; Ti15Zr15Cr15Ni10W10V10Nb15Al10; Ti20Hf15Mo15W10V10Nb15Al15; Ti40Zr10Cr10Ni10W10Mo10Nb10 et al. According to the results of studies in the longitudinal turning of chromium-nickel alloys EI-654 and EI-698 VA, an increase in the efficiency of using high-entropy coatings on a cutting tool by an average of 20—25 % was confirmed.

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