Wear Resistance of Electrospark-Deposited Coatings in Dry Sliding Friction Conditions
Artykuł w czasopiśmie
MNiSW
20
Lista 2021
| Status: | |
| Autorzy: | Holubets Volodymyr M., Paszeczko Mychajło, Borc Jarosław, Tisov Oleksandr, Shpuliar Yuriy S. |
| Dyscypliny: | |
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| Rok wydania: | 2021 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 1-2 |
| Wolumen/Tom: | 60 |
| Strony: | 90 - 96 |
| Web of Science® Times Cited: | 8 |
| Scopus® Cytowania: | 8 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The use of powder-cored wires as electrodes for electrospark deposition (ESD) of coatings onto quenched and low-tempered steel 45 was studied. An industrial PP-Np-PD80Kh20R3T powdercored wire (PW) and a combined powder-cored wire with an MPG-7 graphite addition (PWG) were applied. The mechanical characteristics peculiar to the surface layer of electrospark-deposited coatings produced from the powder-cored wires (hardness HV, friction coefficient , elastic strain energy Aelast, and plastic strain energy Aplast) were quantified. The indenter loading and kinetic indentation depth curves were plotted. Variations in penetration depth Pd and recovery depth Rd of the indenter in scratch tests of the ESD coatings produced from the powder-cored wires were illustrated. Characteristic changes in the mechanical characteristics at a preset indenter penetration depth and the microstructure of the ESD powder-cored coatings subjected to scratch tests were examined. The wear rate of the ESD coatings deposited with PW and PWG electrodes was established as a function of specific loading, sliding speed, and testing time. Variations in roughness of the friction surfaces and temperatures in the contact area in dry sliding friction conditions were studied. The PWG coating showed 24% higher hardness than the PW coating did and 10% lower friction coefficient determined by indentation. The roughness of the PWG coating increased by 10% when loading changed from 3 to 7 MPa. The PWG coating (pin-on-disk friction test) had 2.5 times higher wear resistance than the PW coating did, and the disk (counterface) had 28% lower wear. A slight increase of temperature in the tribological contact area was not found to soften the coating or substrate (quenched and low-tempered steel 45) but promoted regeneration of the protective oxide layer and favorably influenced the friction process. Both materials produced from the powder-cored wires (PW and PWG) exhibited normal mechanochemical wear in experimental conditions. The high wear resistance of the ESD coatings produced from the powder-cored wires in dry friction conditions indicated that they would be beneficial for strengthening and improving the life of various machine parts and mechanisms in industrial mechanical engineering. |
