@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 ¼m due to the
diffusion of nitrogen atoms implanted into the material. X-ray
diffraction spectra showed the presence of µ-NbN, ²-Nb2N and
³-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 = "08 maio 2024"
}