Influence of ag content on mechanical and tribological behavior of DLC coatings
| Autor: | Tomas Polcar, Albano Cavaleiro, A. Escudeiro, N.K. Manninen, Sandra Carvalho, F. Ribeiro |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Tribology Mechanical properties 02 engineering and technology engineering.material 01 natural sciences symbols.namesake Coating Residual stress Ag–DLC 0103 physical sciences Materials Chemistry Cubic zirconia Graphite Composite material 010302 applied physics Science & Technology Metallurgy Structure Surfaces and Interfaces General Chemistry Nanoindentation Sputter deposition 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films Wear mechanisms engineering symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Ag–DLC coatings with Ag contents ranging from 1.3 at.% to 13.1 at.% were deposited by DC magnetron sputtering. The coatings were characterized with respect to their structure (by means of XRD and Raman spectroscopy), mechanical and tribological properties (by scratch test, nanoindentation, residual stress measurements and pin-on-disk test). The incorporation of 13.1 at.% Ag resulted in the formation of Ag grains of 2–3 nm which promoted the increase of graphite like bonds organized in rings. Regarding the mechanical properties, no variations were found for films with Ag contents lower than 13 at.%; a reduction of both hardness and compressive residual stress was then observed for higher values. Pin-on-disk tests were performed at two different contact pressures (690 MPa and 1180 MPa) in dry sliding conditions against a zirconia counterpart. For the lower contact pressure the variations in the wear rate are well correlated with the coating structure and mechanical properties, while for the higher contact pressure the presence of Ag is relevant and Ag–DLC coatings are showing higher wear rate than DLC one. SEM analysis revealed the formation of Ag aggregates on the wear track and adhesion of silver to the counterpart. The work was partially funded by the Czech Science Foundation through the project 108/10/1782 and by the national funds through FCT - Fundacao para a Ciencia e Tecnologia under the grant SFRH/BD/82472/2011 and co-funded by the FSE. This research is sponsored by the FEDER funds through the program COMPETE - Programa Operacional Factores de Competitividade and by the national funds through FCT - Fundacao para a Ciencia e Tecnologia in the framework of the Strategic Projects PEST-C/EME/UIO0285/2011. |
| Databáze: | OpenAIRE |
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