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Journal of Materials Science and Nanotechnology | Volume: 3
March 20-21, 2019 | London, UK
Materials Science and Materials Chemistry
2
nd
International Conference on
M
etals and alloys are of great technological interest which
may even increase if they are nanostructured and, then,
it can be found in the literature many proposed chemical
synthesis methodologies in order obtain different kind of
nanoparticles content materials. Under this subject the main
objectives of this work were to obtain a CuNiCo alloy by an
alternative procedure, capable of generating nanostructured
grains, followed by its preliminary characterization. The first
part was carried out by dividing the process into two steps:
the first one was the thermal decomposition of a nitrate
solution [Cu(NO
3
)
2
, Ni(NO
3
)
2
and Co(NO
3
)
3
] aiming to obtain a
homogeneous co-formed metal oxides mixture. In the second
step, these oxides are heated up to a desired temperature and
kept in a reductive flow of hydrogen, leaving the CuNiCo alloy as
final product. The applied reduction temperatures were in the
range between 300
o
C and 900°C. The materials obtained after
each step were characterized by Scanning Electron Microscopy
(SEM) and Energy Dispersive X-Ray Detector (EDS). As result
of the first step, it was found that oxygen, Cu, Ni and Co were,
as desired, homogeneously distributed. The after reduction
obtained material present different shape and particle size,
depending on the applied reducing temperatures, as illustrated
in Figure 1 to 300
o
C and 900
o
C. The more circular and greater
size observed at 900
o
C confirms an increased sintering
occurrence at higher temperature and the EDS results indicate
the expected composition for Co, Ni and Cu. This alloy was also
observed by Transmission Electron Microscopy (TEM) and have
shown the presence of particles with spherical morphology and
a homogeneous distribution of the elements, which are sharing
the same crystal structure. Also, it was noted the presence of
particles smaller than 100 nm in the CuNiCo alloy.
Speaker Biography
Eduardo A Brocchi is a Metallurgical Engineer from Rio de Janeiro, Brazil. He has completed
his PhD at the Imperial College of Science, Technology and Medicine, London, UK, in 1983.
Since then, he has been teaching, at the Pontifical Catholic University of Rio de Janeiro
(PUC-Rio), Brazil, and, also, carrying out research in the field of high temperature processes
dedicated to extractive metallurgy and materials synthesis. He has participated in the
publication of more than two hundred articles in proceeding and periodicals as well as
has been awarded some prizes. Brocchi became Titular Professor of the University (PUC-
Rio) in 2015 and, at present, is the Head of the Department of Chemical and Materials
Engineering.
e:
ebrocchi@puc-rio.brEduardo A Brocchi
Pontifical Catholic University of Rio de Janeiro, Brazil
Synthesis by hydrogen reduction and characterization of nanoparticles content
CuNiCo alloy