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@Article{CapoteaLugGutMasTra:2018:EfAmSi,
               author = "Capotea, G. and Lugo Gonz{\'a}lez, Dubrazkha Carolina and 
                         Guti{\'e}rrez, J. M. and Mastrapa, G. C. and Trava-Airoldi, 
                         Vladimir Jesus",
          affiliation = "{Universidad Nacional de Colombia} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidad Nacional de Colombia} 
                         and {Pontif{\'{\i}}cia Universidade Cat{\'o}lica do Rio de 
                         Janeiro (PUC-Rio)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "Effect of amorphous silicon interlayer on the adherence of 
                         amorphous hydrogenated carbon coatings deposited on several 
                         metallic surfaces",
              journal = "Surface and Coatings Technology",
                 year = "2018",
               volume = "344",
                pages = "644--655",
                month = "June",
             keywords = "A-C:H coating, Multilayer, Silicon interlayer, Interface, Active 
                         screen, Adhesion, XPS.",
             abstract = "The effect of an amorphous hydrogenated silicon (a-Si:H) 
                         interlayer on the adherence of amorphous hydrogenated carbon 
                         (a-C:H) coatings deposited on four metallic surfaces: AISI M2 
                         steel, AISI 304 stainless steel, Nitinol alloy, and Ti6Al4V alloy 
                         was studied. The interlayers and the coatings were deposited 
                         employing an asymmetrical bipolar pulsed-DC PECVD system with an 
                         active screen. Multilayer a-C:H coatings were also deposited, with 
                         the aim of obtaining thicker films. The interlayers were 
                         synthetized by varying the applied negative pulse amplitude from 
                         \−0.8\ kV to \−10\ kV, keeping their 
                         thickness constant at 250\ nm. The coatings' adhesion was 
                         evaluated using classical scratch and VDI 3198 indentation tests. 
                         Raman spectroscopy was used to analyze the films' atomic 
                         arrangements. The total compressive stress was determined through 
                         the measurement of the substrate curvature before and after the 
                         film deposition, while nanoindentation experiments allowed 
                         determining the films' hardness and elastic modulus. In order to 
                         determine the chemical bonding between a-Si:H and the metallic 
                         surfaces, X-ray photoelectron spectroscopy (XPS) was used. The 
                         obtained results showed high values of critical loads, allowing a 
                         high degree of adherence of the a-C:H coatings to all the metallic 
                         materials. The highest Lc1 critical load values 
                         (\≥25\ N) were determined when the a-Si:H 
                         interlayers were deposited using the highest negative applied 
                         voltage (from \−6\ kV to \−10\ kV) on 
                         the Nitinol alloy surfaces. The XPS results suggested that the 
                         high degree of adhesion of the a-C:H coatings to Nitinol could be 
                         attributed to chemical bonds of TiSi and NiSi formed in the 
                         interface, while for the Ti6Al4V alloy the TiSi bonds 
                         predominated. On the other hand, on steel surfaces the adhesion 
                         was due to FeSi bonds. A combination of a modified pulsed-DC PECVD 
                         system with an active screen and an a-Si:H interlayer allowed 
                         depositing hard, adherent, and low-stress a-C:H coatings.",
                  doi = "10.1016/j.surfcoat.2018.03.093",
                  url = "http://dx.doi.org/10.1016/j.surfcoat.2018.03.093",
                 issn = "0257-8972",
             language = "en",
           targetfile = "capote_effect.pdf",
        urlaccessdate = "04 dez. 2020"
}


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