CrN-Ag nanostructured coatings are deposited onto low-alloy steel substrates by means of PhysicalVapour Deposition (PVD) reactive magnetron sputtering and PVD reactive arc discharge evaporation. Thetwo different kinds of film have been characterized morphologically, chemically and tribologically.Depending on the used technique, as-deposited film shows different morphology, but in both cases, Agnano-clusters are present on the surface. The annealing leads to coarsening of superficial Ag clusters andsegregation out of the CrN matrix, depending on the temperature. After 600 C annealing the surface iscovered by an almost continuous layer of Ag, no matter which deposition technique is used. Tribologicaltests at different temperatures show that the lowest coefficient of friction appears at 600 C for bothcoatings. The analysis of the wear tracks reveals that such a low friction is related to continuous Agsegregation out-of-CrN matrix, which enables self-lubrication.
Nanostructured self-lubricating CrN-Ag films deposited by PVD arc discharge and magnetron sputtering / Incerti, Luca; A., Rota; Valeri, Sergio; A., Miguel; J. A., García; R. J., Rodríguez; J., Osés. - In: VACUUM. - ISSN 0042-207X. - ELETTRONICO. - 85:12(2011), pp. 1108-1113. [10.1016/j.vacuum.2011.01.022]
Nanostructured self-lubricating CrN-Ag films deposited by PVD arc discharge and magnetron sputtering
INCERTI, Luca;VALERI, Sergio;
2011
Abstract
CrN-Ag nanostructured coatings are deposited onto low-alloy steel substrates by means of PhysicalVapour Deposition (PVD) reactive magnetron sputtering and PVD reactive arc discharge evaporation. Thetwo different kinds of film have been characterized morphologically, chemically and tribologically.Depending on the used technique, as-deposited film shows different morphology, but in both cases, Agnano-clusters are present on the surface. The annealing leads to coarsening of superficial Ag clusters andsegregation out of the CrN matrix, depending on the temperature. After 600 C annealing the surface iscovered by an almost continuous layer of Ag, no matter which deposition technique is used. Tribologicaltests at different temperatures show that the lowest coefficient of friction appears at 600 C for bothcoatings. The analysis of the wear tracks reveals that such a low friction is related to continuous Agsegregation out-of-CrN matrix, which enables self-lubrication.
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