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@Article{OliveiraOCGUSPT:2013:DeSuAn,
               author = "Oliveira, Rogerio de Moraes and Oliveira, A. C. and Carreri, F. C. 
                         and Gomes, G. F. and Ueda, M. and Silva, M. M. N. F. and Pichon, 
                         L. and T{\'o}th, A.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and Instituto 
                         Nacional de Pesquisas Espaciais, S{\~a}o Jos{\'e} Dos Campos, 
                         S{\~a}o Paulo, Brazil and Instituto Nacional de Pesquisas 
                         Espaciais, S{\~a}o Jos{\'e} Dos Campos, S{\~a}o Paulo, Brazil 
                         and Instituto Nacional de Pesquisas Espaciais, S{\~a}o Jos{\'e} 
                         Dos Campos, S{\~a}o Paulo, Brazil and Instituto Nacional de 
                         Pesquisas Espaciais, S{\~a}o Jos{\'e} Dos Campos, S{\~a}o 
                         Paulo, Brazil and Instituto Nacional de Pesquisas Espaciais, 
                         S{\~a}o Jos{\'e} Dos Campos, S{\~a}o Paulo, Brazil and 
                         Laboratoire de M{\'e}tallurgie Physique, Universit{\'e} de 
                         Poitiers, Poitiers, France and Institute of Materials and 
                         Environmental Chemistry, CRC HAS, Budapest, Hungary",
                title = "Detailed surface analyses and improved mechanical and tribological 
                         properties of niobium treated by high temperature nitrogen plasma 
                         based ion implantation",
              journal = "Applied Surface Science",
                 year = "2013",
               volume = "283",
                pages = "382--388",
                month = "Oct.",
             keywords = "electron bombardments, friction coefficients, high temperature, 
                         mechanical and tribological properties, niobium nitride, 
                         plasma-based ion implantation, transition metal nitrides, X-ray 
                         diffraction spectrum, mechanical properties, niobium, nitrogen 
                         plasma, surface roughness, transition metal compounds, tribology, 
                         ion implantation.",
             abstract = "Transition metal nitrides, as is the case of NbN, exhibit an 
                         attractive mixture of physical, chemical and mechanical properties 
                         and can be used to overcome a severe constraint of pure niobium, 
                         that is the high oxidation rate for temperature above 400 C. In 
                         this work nitrogen ions were implanted into niobium by means of 
                         plasma based ion implantation (PBII) and high temperature PBII 
                         (HTPBII) in order to produce NbN on the surface of the material. 
                         In the case of HTPBII the treatment was performed in the 
                         temperature of 1000 C and 1250 C. In the process, negative pulses 
                         of 10 kV/20 us/500 Hz were applied to Nb samples for 1 h. The 
                         depth of the modified layer reached up to 4.5 m due to the 
                         diffusion of nitrogen atoms implanted into the material. X-ray 
                         diffraction spectra showed the presence of -NbN, -Nb2N and 
                         -Nb4N3 phases. Wear rate was reduced from 1.5  10-2 mm3/Nm up to 
                         2.6  10-6 mm3/Nm for treated samples at high temperature in 
                         comparison with pristine samples, while friction coefficient was 
                         reduced from 0.8 to 0.25. Hardness was significantly increased. 
                         Surface topography was measured by optical profilometry. Surface 
                         roughness increases with the sample temperature but it remains 
                         lower than the one obtained by conventional PBII, very probably 
                         due to the heating method, which was performed by electron 
                         bombardment.",
                  doi = "10.1016/j.apsusc.2013.06.119",
                  url = "http://dx.doi.org/10.1016/j.apsusc.2013.06.119",
                 issn = "0169-4332",
                label = "scopus 2013-11",
             language = "en",
           targetfile = "1-s2.0-S0169433213012324-main.pdf",
        urlaccessdate = "22 jan. 2021"
}


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