Dependence of the pressure of a shock-initiated graphite-diamond transformation on the initial graphite density and the hysteresis line of this transformation

1987 ◽  
Vol 22 (6) ◽  
pp. 756-761 ◽  
Author(s):  
S. V. Pyaternev ◽  
S. V. Pershin ◽  
A. N. Dremin
Keyword(s):  
Graphite Density ◽  
Initial Graphite

scholarly journals Механические свойства композитного покрытия SiC на графите, полученного методом замещения атомов

2021 ◽  
Vol 47 (20) ◽  
pp. 7
Author(s):  
А.С. Гращенко ◽  
С.А. Кукушкин ◽  
А.В. Осипов ◽  
А.В. Редьков
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Silicon Carbide ◽  
Mechanical Characteristics ◽  
Composite Coatings ◽  
Continuous Film ◽  
Silicon Melt ◽  
First Time ◽  
Initial Graphite ◽  
Scanning Electron

The mechanical properties of composite coatings made of silicon carbide on graphite are studied for the first time. For the deposition of coatings, a new method of annealing the initial graphite was used, which was in contact with a silicon melt in an atmosphere of carbon monoxide.The samples were studied by nanoindentation and scanning electron microscopy. It is shown that the formed coating consists of a continuous film of monocrystalline silicon carbide lying on the surface, dendrites and crystalline druses, with roots going deep into the sample through a system of pores. It is shown that the coating significantly increases the mechanical characteristics of the graphite surface, including the microhardness.

Dependence of Structure of Multilayer Graphene Oxide on Degree of Graphitization of Initial Graphite

2018 ◽  
Vol 54 (3) ◽  
pp. 186-192 ◽  
Author(s):  
A. A. Abakumov ◽  
I. B. Bychko ◽  
A. S. Nikolenko ◽  
P. E. Strizhak
Keyword(s):  
Graphene Oxide ◽  
Multilayer Graphene ◽  
Degree Of Graphitization ◽  
Initial Graphite

scholarly journals Synthesis of cubic diamond in the graphite-magnesium carbonate and graphite-K2Mg(CO3)2 systems at high pressure of 9–10 GPa region

1996 ◽  
Vol 11 (10) ◽  
pp. 2622-2632 ◽  
Author(s):  
T. Taniguchi ◽  
D. Dobson ◽  
A. P. Jones ◽  
R. Rabe ◽  
H. J. Milledge
Keyword(s):  
High Pressure ◽  
Carbon Source ◽  
Carbon Isotope ◽  
Pressure Range ◽  
Graphite Powder ◽  
Magnesium Carbonate ◽  
Pure Magnesium ◽  
Two Systems ◽  
Initial Graphite ◽  
Mixed Carbonate

Cubic diamond was synthesized with two systems, (1) graphite with pure magnesium carbonate (magnesite) and (2) graphite with mixed potassium and magnesium carbonate at pressures and temperatures above 9.5 GPa, 1600 °C and 9 GPa, 1650 °C, respectively. At these conditions (1) the pure magnesite is solid, whereas (2) the mixed carbonate exists as a melt. In this pressure range, graphite seems to be partially transformed into hexagonal diamond. Measured carbon isotope δ13C values for all the materials suggest that the origin of the carbon source to form cubic diamond was the initial graphite powder, and not the carbonates.

Influence Exerted by Pyrite Impurity in the Initial Graphite on Properties of Residual Graphite Hydrosulfates

2004 ◽  
Vol 77 (2) ◽  
pp. 192-195
Author(s):  
A. P. Yaroshenko ◽  
M. V. Savos'kin ◽  
A. N. Magazinskii ◽  
L. Ya. Galushko
Keyword(s):  
Residual Graphite ◽  
Initial Graphite

scholarly journals Fe3O4/Reduced Graphene Oxide Nanocomposite: Synthesis and Its Application for Toxic Metal Ion Removal

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Nguyen Thi Vuong Hoan ◽  
Nguyen Thi Anh Thu ◽  
Hoang Van Duc ◽  
Nguyen Duc Cuong ◽  
Dinh Quang Khieu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Metal Ion ◽  
Magnetic Measurement ◽  
High Surface ◽  
X Ray ◽  
Reduced Graphene ◽  
Initial Graphite

The synthesis of reduced graphene oxide modified by magnetic iron oxide (Fe3O4/rGO) and its application for heavy metals removal were demonstrated. The obtained samples were characterized by X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and magnetic measurement. The results showed that the obtained graphene oxide (GO) contains a small part of initial graphite as well as reduced oxide graphene. GO exhibits very high surface area in comparison with initial graphite. The morphology of Fe3O4/rGO consists of very fine spherical iron nanooxide particles in nanoscale. The formal kinetics and adsorption isotherms of As(V), Ni(II), and Pb(II) over obtained Fe3O4/rGO have been investigated. Fe3O4/rGO exhibits excellent heavy metal ions adsorption indicating that it is a potential adsorbent for water sources contaminated by heavy metals.

Thermal Analysis of Solidification Process and Mechanical Properties in Heavy Section Ductile Iron Casting

2013 ◽  
Vol 750-752 ◽  
pp. 454-461
Author(s):  
Wei Ping Chen ◽  
Li Wei Zhou ◽  
Wen Hui Li ◽  
Zhe Liu
Keyword(s):  
Mechanical Properties ◽  
Eutectic Reaction ◽  
Solidification Process ◽  
The Other ◽  
Eutectic Cell ◽  
Cooling Curves ◽  
Heavy Section ◽  
Chunky Graphite ◽  
Initial Graphite ◽  
Ductile Iron Casting

A heavy section ductile casting (HSDIC) with dimensions of Φ590 mm×800 mm was prepared. Cooling curves at the center, at 85 mm from the center, at 170 mm from the center and at 255 mm from the center of the casting were recorded and analyzed. The results show that the precipitation of initial graphite, nucleation of eutectic cell and mass eutectic reaction at 255 mm from the center were all earlier than the other three locations. Moreover, it takes the longest time of 53 minutes of recalescence at 170 mm from the center with the highest temperature rise of 7 °C, though the cooling rate at this location is not the lowest in the casting, the mechanical properties are the worst. In addition, the largest amount of chunky graphite appears at 170 mm from the center.

Estimation of graphite density and mechanical strength variation of VHTR during air-ingress accident

2008 ◽  
Vol 238 (4) ◽  
pp. 837-847 ◽  
Author(s):  
Eung Soo Kim ◽  
Hee Cheon No ◽  
Byung Joon Kim ◽  
Chang H. Oh
Keyword(s):  
Mechanical Strength ◽  
Strength Variation ◽  
Graphite Density ◽  
Air Ingress
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