Laser vaporization synthesis of carbon materials in the presence of high-pressure Ar gas

2004 ◽  
Author(s):  
Fumio Kokai ◽  
Akira Koshio ◽  
Atsuko Nakayama ◽  
Kunimitsu Takahashi ◽  
D. Kasuya ◽  
...  
Keyword(s):  
High Pressure ◽  
Carbon Materials ◽  
Laser Vaporization ◽  
Ar Gas

scholarly journals Effect of the porous structure in carbon materials for CO2 capture at atmospheric and high-pressure

Carbon ◽  
2014 ◽  
Vol 67 ◽  
pp. 230-235 ◽  
Author(s):  
Mirian E. Casco ◽  
Manuel Martínez-Escandell ◽  
Joaquín Silvestre-Albero ◽  
Francisco Rodríguez-Reinoso
Keyword(s):  
High Pressure ◽  
Porous Structure ◽  
Co2 Capture ◽  
Carbon Materials

scholarly journals Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity

2016 ◽  
Vol 4 (38) ◽  
pp. 14739-14751 ◽  
Author(s):  
Saunab Ghosh ◽  
Marta Sevilla ◽  
Antonio B. Fuertes ◽  
Enrico Andreoli ◽  
Jason Ho ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Pore Volume ◽  
Carbon Materials ◽  
Total Pore Volume ◽  
Uptake Capacity ◽  
Heteroatom Doping ◽  
Carbon Dioxide Uptake ◽  
Performance Map ◽  
Methane Selectivity

The relative influence of heteroatom doping, surface area, and total pore volume of highly microporous carbon materials on CO2 uptake capacity, and the CO2/CH4 selectivity, at high pressure (≤30 bar) is presented.

scholarly journals Self-Propagating High Temperature Synthesis of MgB2 Superconductor in High-Pressure of Argon Condition

2017 ◽  
Vol 19 (2) ◽  
pp. 177 ◽  
Author(s):  
S. Tolendiuly ◽  
S. M. Fomenko ◽  
G. C. Dannangoda ◽  
K. S. Martirosyan
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Pressures ◽  
Volume Fraction ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Ar Gas

<p>Magnesium diboride can be synthesized under argon ambient, elevated or high pressures. High-pressure syntheses are promising methods for manufacturing of the bulk MgB<sub>2</sub> superconductor material. We have been used high pressure of Ar gas in order to investigate its effect on properties of MgB<sub>2</sub> superconductor such as critical temperature and current density. Bulk MgB<sub>2</sub> superconductor was synthesized from elemental Mg–B powders in thermal explosion mode of self-propagating high-temperature synthesis (SHS) under argon pressure of 25 atm. XRD pattern of the as-synthesized product indicates an almost complete conversion of the reactants to the MgB<sub>2</sub> single phase. Most of the diffractions peaks are related to the MgB<sub>2</sub> polycrystalline bulk material. The impurity fraction is less than 24.3% in total sample and identified as MgO and MgB<sub>4</sub> secondary phases. The positive effect of pressure of Ar gas during synthesis of MgB2 on critical current density JC has been confirmed. The critical current density of the sample was achieved in high pressure reactor was 3.8×10<sup>6</sup> A/cm<sup>2</sup>. A superconducting volume fraction of 16% under a magnetic field of 10 Oe was obtained at 5 K, indicating that the superconductivity was bulk in nature. The succeeded level of superconductor parameters of the high-pressure synthesized MgB<sub>2</sub> and the possibility to produce a large bulk products make this technology very promising for practical applications.</p>

scholarly journals Method of Calculating Carbon Ablation in the Jet of Liquid Rocket Engine Combustion Products

2019 ◽  
pp. 4-21
Author(s):  
V.V. Gorskiy ◽  
M.G. Kovalsky ◽  
V.G. Resh
Keyword(s):  
High Pressure ◽  
Carbon Materials ◽  
Thermal Protection ◽  
Rocket Engine ◽  
Combustion Products ◽  
Liquid Rocket Engine ◽  
Experimental Development ◽  
Engine Combustion ◽  
Material Erosion ◽  
Liquid Rocket

Nowadays carbon materials are widely used as ablating thermal protection for high-temperature structural elements in aerospace technology. Prediction of changes in the shape of the external surfaces of these elements, due to the burning of thermal protection, is closely related to the use of computational-theoretical methods describing the flow of various physicochemical and mechanical processes associated with the occurrence of the phenomenon under consideration. At the same time, it is crucial to test such methods on the results of experimental studies conducted under conditions which are implemented during the process of testing thermal protection in jets of aerodynamic units. The main elements of ablation of carbon materials include their erosion, i.e., mechanical ablation of mass, observed in high-pressure gas flows. In the process of experimental development, it is necessary to carry out research on large-scale models, which has led to widespread use of underexpanded jets of combustion products of liquid rocket engine combustion products for modeling the erosion process of thermal protection. The theoretical model of ablation of thermal protection in such jets requires taking into account the complex chemical composition of the gas mixture flowing into the model; physical and chemical interaction of this gas with thermal protection, which causes gasification of the latter; use of mathematical models describing the process of material erosion due to mechanical impact of high-pressure gas flow. The paper describes the development of the carbon material ablation calculating and theoretical methodology which could be used to determine the material erosion characteristics on the basis of solving a complex problem of circumfluence, heating, heat penetration and ablation of thermal protection.

Structural Characterization of Micro- and Mesoporous Carbon Materials Using In Situ High Pressure 129Xe NMR Spectroscopy

2014 ◽  
Vol 26 (10) ◽  
pp. 3280-3288 ◽  
Author(s):  
Martin Oschatz ◽  
Herbert C. Hoffmann ◽  
Julia Pallmann ◽  
Jana Schaber ◽  
Lars Borchardt ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Structural Characterization ◽  
Mesoporous Carbon ◽  
Carbon Materials ◽  
129Xe Nmr ◽  
Mesoporous Carbon Materials

High-pressure non-equilibrium microwave plasma source by using carbon materials

1997 ◽  
Vol 97 (1-3) ◽  
pp. 404-409 ◽  
Author(s):  
S. Maeda ◽  
H. Matsuo ◽  
K. Kuwahara ◽  
Y. Matsuda ◽  
H. Kuwahara ◽  
...  
Keyword(s):  
High Pressure ◽  
Carbon Materials ◽  
Microwave Plasma ◽  
Plasma Source ◽  
Non Equilibrium
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