@Article{MartinattiSanDurCruRan:2012:LuCoPr,
               author = "Martinatti, Jos{\'e} Fernando and Santos, L{\'u}cia Vieira and 
                         Durrant, S F and Cruz, N C and Rangel, E C",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Lubricating coating prepared by PIIID on a forming tool",
              journal = "Journal of Physics: Conference Series",
                 year = "2012",
               volume = "370",
                pages = "012022",
             keywords = "Lubricating coating, a-C:H films, hybrid plasma immersion ion 
                         implantation and deposition.",
             abstract = "In this work, the performance of a-C:H films produced by the 
                         hybrid Plasma Immersion Ion Implantation and Deposition technique 
                         as lubricating layers for a steel forming tool has been 
                         investigated. Hardened steel (AISI M2, 64 HRC) plates coated with 
                         a commercial TiN layer were used as substrates and the films were 
                         deposited in a vacuum chamber fitted with two parallel-plate 
                         electrodes. The discharges were generated in atmospheres composed 
                         of 91% C2H2 and 9% Ar by the application of radiofrequency power 
                         (13.56 MHz, 100 W) to the upper electrode while the lower one, 
                         also used as the sample holder, was biased with high voltage 
                         negative pulses (3.6 kV, 30 {\`{\i}}s, 300 Hz). A deposition 
                         time of 840 s was used. The effects of the gas pressure, p, on 
                         thickness, molecular structure, wettability, surface morphology 
                         and topography, hardness and friction coefficient of the films 
                         were investigated. Film thickness increased from 0.3 to 0.5 
                         {\`{\i}}m when p was increased from 2.7 to 16.5 Pa. Generally, 
                         the films were slightly hydrophilic, with contact angles of around 
                         84°, and the deposition decreased the roughness of the steel. A 
                         polymer-like structure was detected in high pressure depositions 
                         and an amorphous carbon structure derived from the low pressure 
                         procedures. Hardness decreased from 8.2 to 7.0 GPa with increasing 
                         p. Improvement in tribological performance was indicated by the 
                         fall in the friction coefficient from 0.5 to 0.2 as the deposition 
                         pressure was reduced. Operating at the latter value (of micro) 
                         would lead to a significant reduction in wear and hence to 
                         significant economy in diverse industrial applications.",
                  doi = "10.1088/1742-6596/370/1/012022",
                  url = "http://dx.doi.org/10.1088/1742-6596/370/1/012022",
                 issn = "1742-6588",
                label = "lattes: 4359261479122193 6 MartinattiMCRCSDDSR:2012:LuCoPr",
             language = "pt",
           targetfile = "1742-6596_370_1_012022.pdf",
        urlaccessdate = "30 abr. 2024"
}