Hardness, adhesion strength, and tribological properties of adaptive nanostructured ion-plasma vacuum-arc coatings (Ti,Al)N–Mo2N
| Autor: | D. S. Belov, I. V. Blinkov, V. S. Sergevnin, A. O. Volkhonskii, A. V. Chernogor, A. Yu. Krupin |
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| Rok vydání: | 2016 |
| Předmět: |
Toughness
Materials science Metallurgy Metals and Alloys Oxide 02 engineering and technology Vacuum arc Tribology engineering.material 021001 nanoscience & nanotechnology Grain size Surfaces Coatings and Films chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Coating Mechanics of Materials engineering Sublimation (phase transition) Lubricant 0210 nano-technology |
| Zdroj: | Russian Journal of Non-Ferrous Metals. 57:572-579 |
| ISSN: | 1934-970X 1067-8212 |
| DOI: | 10.3103/s1067821216060134 |
| Popis: | The properties of nanostructured multilayered coatings of the composition (Ti,Al)N–Mo2N, which were fabricated by the ion-plasma vacuum-arc deposition (arc-PVD), are investigated. The thickness of coating layers is comparable with the grain size, which is about 30–50 nm. The coating hardness reaches 40 GPa with relative plastic deformation work of about 60%. It is established by measuring scratching that the cohesion destruction character of the coating occurs exclusively according to the plastic deformation mechanism, which evidences its high fracture toughness. The local coating attrition to the substrate takes place under a load on the order of 75 N. The coating friction coefficient in testing conditions according to the “pin-on-disc” layout using the Al2O3 counterbody under a load of 5 N is 0.35 and 0.50 at temperatures of 20 and 500°C, respectively. The coating is almost unworn because of the formation of MoO3 oxide (the Magneli phase) operating as the solid lubricant in the friction zone. An increase in the friction coefficient and noticeable wear are observed with the further increase in the testing temperature, which is associated with the sublimation intensification of MoO3 from the working surfaces and lowering its operational efficiency as the lubricant. |
| Databáze: | OpenAIRE |
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