@Article{OliveiraHoOlSiPiSa:2017:EvReOx,
author = "Oliveira, Rog{\'e}rio de Moraes and Hoshida, Lilian and Oliveira,
Aline C. and Silva, Matheus Moraes Novaes Ferreira da and Pichon,
Luc and Santos, Nazir Monteiro dos",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de S{\~a}o Paulo (UNIFESP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {CNRS-Universit{\'e} de Poitiers-ENSMA} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Evaluation of the resistance to oxidation of niobium treated by
high temperature nitrogen Plasma Based Ion Implantation",
journal = "Surface and Coatings Technology",
year = "2017",
volume = "312",
pages = "110--116",
month = "Feb.",
keywords = "High temperature, Ion implantation, Niobium, Oxidation, Plasma.",
abstract = "Niobium is a technological material used in very distinct
applications. Most of them as an alloying element, making part of
superconducting radio frequency cavities, nuclear reactor
components, missiles, rockets, aviation and space-system
engineering. Nevertheless, although refractory, pure niobium
presents as the main drawback the poor oxidation resistance in
moderate and high temperatures. Different treatment methods have
been used to mitigate this issue, as is the case of cementation,
conventional nitridation, CVD and PVD processes. The evaluation of
the resistance to oxidation of Nb treated by high temperature
nitrogen plasma based ion implantation (HTPBII) has been described
herein. The implanted nitrogen in this case easily diffuses to
inner layers of niobium heated up to 1250 °C during treatment,
reaching depths of about 7 \μm, while its atomic
concentration of about 25% remains stable for almost the whole
treated surface. This allows the formation of thick nitride
layers. The produced interstitial nitrides have outstanding
properties as the high hardness and strength, like ceramics, and
high thermal and electrical conductivities, like metals. In
addition, these refractory nitrides also present good chemical
resistance and superior resistance against oxidation. The
investigation performed herein includes a series of
characterization performed by X-ray diffraction (XRD), X-ray
photoelectron spectroscopy (XPS), glow discharge optical emission
spectroscopy (GDOES), scanning electron microscopy (SEM), and
thermogravimetric analysis (TGA). The oxidation of the
ion-implanted niobium was retarded in comparison with the
untreated counterpart in about 130 °C. Isothermal analysis
revealed reduced oxidation rate when treatment time was extended
from 4 h to 8 h.",
doi = "10.1016/j.surfcoat.2016.10.012",
url = "http://dx.doi.org/10.1016/j.surfcoat.2016.10.012",
issn = "0257-8972",
language = "en",
targetfile = "oliveira_evulation.pdf",
urlaccessdate = "27 abr. 2024"
}