Begell House Inc.
Nanoscience and Technology: An International Journal
NST
2572-4258
5
3
2014
Z-POTENTIAL OF COLLOIDAL NANOPARTICLES AS A FUNCTION OF MAGNETIC TREATMENT TIME AND TEMPERATURE
169-179
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.10
Semen I.
Koshoridze
Institute of Applied Mechanics, Russian Academy of Sciences (IAM RAS), 7/1 Leningradsky Ave., Moscow, 125040, Russia
Yu. K.
Levin
Institute of Applied Mechanics of Russian Academy of Sciences, 7
Leningradsky Ave., Moscow, 125040, Russia
colloidal particles
double electrical layer
coagulation
Z-potential
magnetic water treatment
The reduction of the Z-potential of colloidal particles due desorption of counterions depending on
the ion desorption time and the water temperature in approximation of the plane as well as spherical double electrical layers under the conditions of magnetic water-flow treatment was investigated for the first time. The results of calculation of the probability of coagulation of colliding colloidal particles as a function of temperature are presented. Determining the dependence of Z-potential of colloidal particles on the time of magnetic treatment and the desorption process characteristics
will allow increasing antiscaling efficiency of magnetic water-flow treatment installations.
PARAMETERS OF CHEMICAL VAPOR DEPOSITION ON A STRUCTURE AND THE PROPERTIES OF NANOSTRUCTURED TaC COATING ON A CARBON COMPOSITE MATERIAL
181-189
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.20
S. A.
Eremin
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation
V. N.
Anikin
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation
I. N.
Burmistrov
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation; Yuri Gagarin State Technical University of Saratov, Saratov,
Russian Federation
K.
Chuprunov
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation
A.
Yudin
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation
Denis
Leybo
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation
D. V.
Kuznetsov
National University of Science and Technology "MISIS", 4 Leninsky Ave., Moscow, 119049, Russian Federation
coatings
tantalum carbide
tantalum chloride
chemical vapor deposition
carbon
composite materials
Nanostructured heat-resistant tantalum carbide coatings on a carbon composite material were synthesized and characterized in this work. The main goal of tantalum carbide deposition is to decrease diffusion of oxygen to the composite support during operation at high temperatures of up to 1600°C and to protect the carbon surface against oxidation. A tantalum carbide coating
was obtained by tantalum chloride deposition from the gas phase in methane atmosphere. Characterization
of coatings was performed by scanning electron microscopy, x-ray diffraction, and energy dispersive x-ray spectroscopy techniques. It was established that the reaction of TaC synthesis proceeds to the highest extent at 1000°C with the coating thickness of 20 μ;m and tantalum interpenetration depth into the carbon composite structure of 400 μ;m. The obtained data on the composition and structure of coatings showed that the nanostructured coating material interacted strongly with the surface of carbon composite. The obtained coating had low porosity and could be effectively used for protection of a carbon composite in oxidative environment at high
temperatures.
MOLECULAR DYNAMICS CALCULATION OF HYDROGEN CHEMISORPTION ON THE SURFACE OF SINGLE-WALLED CARBON NANOTUBES
191-199
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.30
Sergey
Gromov
National University of Science and Technology "MISIS", 4 Leninsky Ave., Moscow, 119049, Russian Federation
Yu.
Ponomareva
National University of Science and Technology "MISIS", 4 Leninsky Ave., Moscow, 119049, Russian Federation
single-walled carbon nanotubes
adsorption
molecular dynamics
Three types of single-walled carbon nanotubes (5,5), (9,5), (9,9) were simulated with the aid of the molecular dynamics method to investigate the hydrogen adsorption process using the AIREBO potential. The obtained data allowed one to show the relation between nanotube chirality parameters and maximum hydrogen uptake. It was also found that surface charge of chiral CNT's could not be compensated for the same amount of time that leads to fully neutral surface of armchair type CNT's.
ALUMINUM POWDER COMPOSITES REINFORCED BY OXIDE NANOPARTICLES USED AS MICROADDITIVES
201-211
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.40
L. E.
Agureev
State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Systems
V. I.
Kostikov
National Research Technological University "Moscow Institute of Steel
and Alloys", Chair of Powder Metallurgy and Functional Coatings
R. N.
Rizakhanov
State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Systems
Zh. V.
Eremeeva
National Research Technological University "Moscow Institute of Steel
and Alloys", Chair of Powder Metallurgy and Functional Coatings
A. A.
Barmin
State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Systems
S. V.
Savushkina
State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Systems
A. A.
Ashmarin
1State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Systems
B. S.
Ivanov
State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Systems
R. I.
Rudshtein
State Scientific Center of the Russian Federation − Federal State Unitary
Enterprise "M. V. Keldysh Research Center", Center on Application of Nanotechnologies in Power and Electricity Supply of Outer Space Syste; National Research University "Higher School of Economics",20 Myasnitskaya Str., Moscow, 101000, Russia
aluminum composite
nanoparticles
oxides
powder metallurgy
cold pressing
Special features of sintering of aluminum composites produced by powder technology with introduction of oxide nanoparticles as microadditives have been investigated. The technology of production of aluminum composites included cold pressing and vacuum sintering. The microstructure of the produced materials was investigated. The influence of oxide nanoparticles as microadditives
on the mechanical properties of powdered aluminum was identified. Optimal concentrations of nanoparticles in a range from 0.01 to 0.15 vol.%, ensuring optimum improvement of the mechanical properties of aluminum composites, were determined.
STRUCTURE FORMATION AND CHANGES IN THE REACTIVITY OF COMPOSITE GRANULES OF THE Nb−Si SYSTEM IN MECHANICAL ACTIVATION
213-221
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.50
Yu. A.
Abuzin
National University of Science and Technology (MISIS), 4 Leninsky Ave.,
Moscow 119049, Russia
M. N.
Kulikova
National University of Science and Technology "MISiS", Moscow, Russia
V. S.
Levchenko
National University of Science and Technology "MISiS", Moscow, Russia
T. B.
Sagalova
National University of Science and Technology "MISiS", Moscow, Russia
A. G.
Gavrilova
National University of Science and Technology "MISiS", Moscow, Russia
N. B.
Smirnov
National University of Science and Technology "MISiS", Moscow, Russia
mechanical activation
composite granules
synthesis
energy accumulation
niobium silicides
microstructure
nanoparticles
The basic laws governing the structure formation and changes in the activity of composite granules
of the Nb-Si system in mechanical activation in order to reach maximum efficiency of the subsequent synthesis of niobium silicides have been considered. The mechanical activation of composite granules was performed using a Retsch PM 400 planetary mill. The activity, characterizing
integrally the energy intensity and the reactivity of composite granules, was evaluated by the velocity of propagation of the front of the linearly organized reaction of niobium silicides synthesis. The structure was investigated with the aid of a light and an electronic microscope, as well as an X-ray diffractometer. Typical structures of composite granules and the charts of
changes in their activity as a function of processing time are presented. The initial growth of activity
is conditioned by the increasing uniformity of distribution and enlargement of the contact area of niobium and silicon, decrease in the share of niobium defect regions, not containing silicon, and accumulation of internal energy related to the increasing imperfection of the crystalline structure of the components. A decrease in the activity after reaching the maximum is related to
chemical interaction of the components in microvolumes of composite granules and relaxation of the accumulated energy. We identified the structuring role of silicon: its nanosized particles, having superhigh conglomeration capacity, capture and bond the niobium particles, thus ensuring the formation of structures of composite granules. The regions of niobium that are free from silicon represent the basic structural defect of granules. An increase in the mechanical activation time results
in thinning of the niobium particles and silicon layers, thus generating a more homogeneous structure and reducing the relative volume of defect regions. The optimal time of silicon preprocessing was found to be 60 min. The Nb5Si3 composite granules have the maximum activity after
180 min of mechanical activation, while Nb3Si granules after 260 min.
INFLUENCE OF MWCNT CONCENTRATION ON ELECTRICAL CONDUCTIVITY OF ETHYLENE-1-OCTENE COMPOSITES
223-228
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.60
I. A.
Ilinykh
National University of Science and Technology "MISiS", 4 Leninsky Ave., Moscow, 119049, Russian Federation
Dmitry S.
Muratov
National University of Science and Technology "MISIS", 4 Leninsky Ave., Moscow, 119049, Russian Federation
N. V.
Gorshkov
Yuri Gagarin State Technical University of Saratov, Saratov 410054, Russia
I. N.
Burmistrov
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation; Yuri Gagarin State Technical University of Saratov, Saratov,
Russian Federation
D. V.
Kuznetsov
National University of Science and Technology "MISIS", 4 Leninsky Ave., Moscow, 119049, Russian Federation
E. A.
Yakovlev
Yuri Gagarin State Technical University of Saratov, Saratov 410054, Russia
carbon nanotubes
polymer composites
electrical conductivity
impedance spectroscopy
alternating current
The frequency dependence of the electrical conductivities of polymer composites with different MWCNT contents is considered. The composite tested was obtained by means of a roller mixer. It is shown that the AC conductivities has frequency-independent and frequency-dependent regions. The frequency-independent region was approximated to the DC conductivity. The frequency-dependent conductivity increases with frequency according to an approximate exponential power law that can be indicative of the hopping mechanism of conductivity.
MODELING OF FIBER WHISKERIZATION IMPACT ON THE RESIDUAL STRESS−STRAIN STATE OF LAYERED COMPOSITES
229-238
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.70
A. V.
Afanasiev
Moscow Aviation Institute (National Research University), 4 Volokolamskoe Highway, Moscow, 125993, Russian Federation
D. Q.
Nguen
Moscow Aviation Institute (National Research University), 4 Volokolamskoe Shosse, Moscow, 125993, Russia
Yury O.
Solyaev
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradskii Ave., Moscow, 125040, Russia; Moscow Aviation Institute, 4 Volokolamskoe Highway, Moscow, 125080, Russia
A. A.
Dudchenko
Moscow Aviation Institute (National Research University), 4 Volokolamskoe Shosse, Moscow, 125993, Russia
carbon fiber-reinforced plastic
modeling
residual stress-strain state
whiskerization
A methodology for determining residual stresses and strains in flat polymer composite panels reinforced
by nanomodified whiskered fibers is suggested. In order to calculate the effective properties of the whiskered monolayer, an approach based on the model of multilayered cylindrical inclusion is used. The properties of the interfacial whiskered area are determined by the model of
elliptical inclusions with chaotic orientation. The residual stresses in the panels are determined
by a classical thermoelasticity model for layered composites. As an example, we consider a problem
of residual stresses and strains in a carbon fiber-reinforced plastic panel reinforced by whiskered
fibers with carbon nanotubes grown on its surfaces. The computations conducted show a practical possibility for eliminating the residual stress and strain in the material with different variants of reinforcement. It is also shown that the model suggested can be used to predict different
whiskerization parameters that allow reducing anisotropy of the thermal expansion coefficients in composites.
INVESTIGATING THE OPPORTUNITIES FOR DEFINING THE FATIGUE CHARACTERISTICS OF TOOLS WITH A NANOLAYER COATING DURING CUTTING
239-248
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.80
A. I.
Pyanov
National University of Science and Technology "MISiS", Moscow, Russia
V. N.
Anikin
National University of Science and Technology "MISiS", 4 Leninskiy Ave., Moscow, 119049, Russian Federation
A. A.
Pyanov
National University of Science and Technology "MISiS", Moscow, Russia
fatigue
cutting tool
coating
methods
residual stress
The efficiency of contemporary machine-building manufacture is closely related to ensuring the
quality in conditions of intensification and high-level automation of technological processes. The use of numerically controlled machines, automated machine complexes, and flexible production systems increased the process output efficiency significantly due to concentration of operations in the same equipment. However, unstable and, sometimes, low operational characteristics of the cutting tools remain a factor restraining further increase of mechanical processing efficiency. One of the most promising ways to increase tool durability by protecting the contact surfaces
(solid solutions and carbides) is the application of the cutting blades with a thin wear-resistant coating deposited layer by layer using ion-plasma methods. In such case, the thickness of the coating deposited in one run by the spray unit makes 20-200 nm. This work investigates hard alloys with such nanolayer nitride and oxide coating.
Such blades with wear-resistant coating should meet strict requirements in the process of their manufacture and operation. One of the conditions for successful application of the blades is a high degree of adhesion between the coating and the substrate. In identical coating conditions, the degree of adhesion is defined by the structural defects on the coating-substrate interface and the residual stress. The residual stress may not only reduce the adhesion, but deteriorate the coating properties, i.e., generate microcracks resulting in the coating chipping and fracture. Thusly, the operation efficiency of tools equipped with blades with wear-resistant coating depends not only on the wear resistance of the coating, but also on the coating-substrate characteristics and the effective stress.
Currently, the cutting properties of blades with a coating are evaluated only by the resistance, whereas methods for determining the fatigue characteristics of the blades with a deposited coating are nonexistent. In this work, we propose such method by testing it on nanolayer coating based on titanium nitride and aluminum oxide. Also, we investigate the modifications in the structure of the processed and worn samples of hard alloy with a coating.
THERMOPLASTIC MATERIALS WITH A NANOCARBON DISCRETE FILLER FOR SUBSTITUTING MAGNESIUM AND ALUMINUM ALLOYS IN THE PRODUCTION OF CASES OF ADVANCED AIRCRAFT ENGINES
249-254
10.1615/NanomechanicsSciTechnolIntJ.v5.i3.90
M. M.
Smirnov
Scientific and Production Complex of Polymer Composite Materials OJSC
"Kuznetsov", Samara, Russia
3D printing
nanocomposites
thermoplastics
engine case
fullerene powders
carbon nanotubes
The possibilities of developing complex cases of gas-turbine engine components from heat-resistant thermoplastics, filled with nanocomponents, and 3D printing are considered. Such an approach can be used to substitute the current technologies based on application of magnesium alloys. The proposed nanocomposite thermoplastics possess higher strength, rigidity, and thermal resistance and have a lower thermal-expansion coefficient. The use of the proposed technology
and materials will reduce, in dozens of times, the design period and speed up the introduction and implementation of the new products.