State Research Institute of Structural Graphite Materials

Moscow, Russia

State Research Institute of Structural Graphite Materials

Moscow, Russia
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Samoilov V.M.,State Research Institute of Structural Graphite Materials | Nikolaeva A.V.,State Research Institute of Structural Graphite Materials | Danilov E.A.,State Research Institute of Structural Graphite Materials | Erpuleva G.A.,State Research Institute of Structural Graphite Materials | And 3 more authors.
Inorganic Materials | Year: 2015

Concentrated suspensions of few-layer graphene particles have been prepared via natural graphite exfoliation by ultrasonic processing in the presence of a fluorine-containing surfactant and with no surfactant. The kinetics of the process and the properties of the products have been studied using laser diffraction, X-ray diffraction, transmission electron microscopy, electron diffraction, and Raman spectroscopy. We have obtained aqueous suspensions containing up to 95% few-layer graphene with a concentration of 6 mg/mL. © 2015 Pleiades Publishing, Ltd.


Samoilov V.M.,State Research Institute of Structural Graphite Materials
Inorganic Materials | Year: 2010

We have studied the specific surface area, shape, and size of fine particles of isotropic and needle cokes and isotropic graphite. The results demonstrate that, as the average particle size is reduced from 1000 to 1.5 μm, the BET specific surface area of the powders increases from 0.1 to 100 m 2/g, exceeding the geometric surface area of the particles by a factor of 40-60. The particle size distributions of the coke and graphite powders produced under identical milling conditions are similar to one another and can be represented by the Rosin-Rammler equation. The anisometry of the powder particles is higher at a stronger microtexture of the starting material and decreases with decreasing particle size. © Pleiades Publishing, Ltd., 2010.


Samoilov V.M.,State Research Institute of Structural Graphite Materials | Vodovozov A.N.,RASTER Technology Ltd. | Smirnov V.K.,State Research Institute of Structural Graphite Materials | Zaitsev G.G.,State Research Institute of Structural Graphite Materials
Inorganic Materials | Year: 2011

Fine-grain SiC-based ceramics have been produced via infiltration of molten silicon into preforms fabricated from SiC and graphite powders, with a phenol-formaldehyde resin as a binder. The materials thus prepared have a density of 2.70-3.15 g/cm 3, dynamic modulus of elasticity from 200 to 400 GPa, compressive strength from 800 to 1900 MPa, bending strength from 150 to 315 MPa, thermal expansion coefficient (KTE) of 4.1 × 10 -6 K -1, and thermal conductivity of 140-150 W/(m K). Their properties are compared to those of known silicon carbide materials fabricated by other processes. The results indicate that the density and physicomechanical properties of the silicon carbide ceramics depend little on the fabrication process and are determined primarily by the SiC content. Increasing the SiC content from 20 to 99.5 wt % increases the density of the ceramics from 2.2 to 3.15 g/cm 3 and leads to an exponential rise in their physicomechanical parameters: an increase in modulus of elasticity from 95 to 430 GPa, in compressive strength from 120 to 4200 MPa, and in bending strength from 70 to 410 MPa. The thermal conductivity of the ceramics depends very little on the fabrication process, falling in the range 100-150 W/(m K) over the entire range of SiC concentrations. Their KTE decreases slightly, from 4.3 × 10 -6 to 2.4 × 10 -6 K -1, as the SiC content increases to 99-100 wt %. © 2011 Pleiades Publishing, Ltd.

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