Reduction of the coefficient of friction of niobium nitride coatings by the addition of bismuth
| Autor: | Abril Fonseca-García, Celia L. Gomez, J. Pérez-Alvarez, Stephen Muhl, Juan Camilo Medina, Sandra E. Rodil, Enrique Camps, Cecilia C. Barrera-Ortega, Osmary Depablos-Rivera, Roberto Mirabal-Rojas |
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| Rok vydání: | 2016 |
| Předmět: |
Niobium nitride
Materials science Composite number Metallurgy chemistry.chemical_element 02 engineering and technology engineering.material Sputter deposition Tribology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Bismuth chemistry.chemical_compound chemistry Coating Phase (matter) engineering Thin film Composite material 0210 nano-technology Instrumentation |
| Zdroj: | Vacuum. 125:146-153 |
| ISSN: | 0042-207X |
| DOI: | 10.1016/j.vacuum.2015.12.016 |
| Popis: | Composite coatings of niobium nitride containing bismuth inclusions were deposited using a dual magnetron sputtering system with independent power suppliers for each targets; Bi and Nb. The deposition was performed under and Ar/N2 atmosphere at a 2.3 flow rate ratio, which allows the stoichiometric NbN phase to be obtained. The aim of this work was to evaluate the effect of increasing concentrations of Bi, proposed as a lubricous second phase, in the structural, mechanical and tribological properties of niobium nitride (NbN) coatings, searching for a reduction in the coefficient of friction but trying to keep hardness values larger than the tool steels (>10 GPa). The power applied to the Nb target was fixed, while the power on the Bi target was increased; obtaining Bi atomic percentage values of 1.7, 4.9 and 8.4 at%. The Bi inclusions showed different sizes and distribution in the volume and surface of the coatings. The results indicated a reduction in the hardness from 30 GPa of the NbN coating to 13.9 GPa for the highest Bi concentration. However, a more significant reduction was observed for the coefficient of friction (CoF) from 0.8 of the NbN to 0.3 for Bi concentrations between 4.9 and 8.4 at%. |
| Databáze: | OpenAIRE |
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