The Experts below are selected from a list of 5196 Experts worldwide ranked by ideXlab platform
D. V. Onishchenko - One of the best experts on this subject based on the ideXlab platform.
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Fundamentals of technology of Mechanochemical Synthesis of titanium carbide using various carbon components
Theoretical Foundations of Chemical Engineering, 2020Co-Authors: D. V. Onishchenko, V. P. RevaAbstract:It was established that the main criteria for achieving Mechanochemical Synthesis in titanium-carbon system represent the structure of carbon modifications and their degree of aromaticity. The promise of the use of soot + graphite carbon composition for the Mechanochemical Synthesis of titanium carbide is mentioned. It has been shown that titanium carbide synthesized according to this technology has high sorption activity.
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FEATURES OF Mechanochemical Synthesis OF TUNGSTEN AND TITANIUM CARBIDES WITH PARTICIPATION OF NATURAL GRAPHITE
Refractories and Industrial Ceramics, 2020Co-Authors: V. P. Reva, D. V. OnishchenkoAbstract:It is established that the ash content of natural graphite is the main limiting factor in implementing Mechanochemical Synthesis of titanium carbide in the system Ti–Cgr and tungsten carbide in the system WO3–Mg–Cgr. The promising nature of using a carbon black composition + natural graphite for reducing sulfur content in titanium carbide prepared by Mechanochemical Synthesis is demonstrated.
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Mechanochemical Synthesis of tungsten carbide with the participation of various carbon components
Russian Journal of Non-ferrous Metals, 2020Co-Authors: V. P. Reva, D. V. OnishchenkoAbstract:It is established that the main criteria for implementing the Mechanochemical Synthesis of tungsten carbide are the structure of modifications of carbon and their degree of aromaticity. Prospects for using modifications of carbon fabricated by the pyrolysis of vegetable raw materials are shown.
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Factors influencing the Mechanochemical Synthesis of tungsten and titanium carbides
Russian Metallurgy, 2020Co-Authors: D. V. Onishchenko, V. P. RevaAbstract:Nanometer-sized tungsten monocarbide and titanium carbide are produced by mechanical activation. The formation of the former carbide is shown to be promoted by the introduction of polymethylmethacrylate into the initial charge for synthesizing tungsten carbide. It is found that the main limiting factors of the Mechanochemical Synthesis in the titanium-carbon system are the structure of carbon modifications and the degree of their aromaticity.
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Specifics of the Mechanochemical Synthesis of titanium and tungsten carbides from various carbon components
Russian Journal of Physical Chemistry B, 2020Co-Authors: V. P. Reva, D. V. OnishchenkoAbstract:It is established that the main limiting factor in the implementation of Mechanochemical Synthesis in the Ti + C and WO3 + Mg + C systems is the degree of aromaticity of the carbon ingredient. The possibility of using carbon modifications produced by pyrolysis of plant raw materials for the Synthesis of the respective carbides with a minimum sulfur content.
V. P. Reva - One of the best experts on this subject based on the ideXlab platform.
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Fundamentals of technology of Mechanochemical Synthesis of titanium carbide using various carbon components
Theoretical Foundations of Chemical Engineering, 2020Co-Authors: D. V. Onishchenko, V. P. RevaAbstract:It was established that the main criteria for achieving Mechanochemical Synthesis in titanium-carbon system represent the structure of carbon modifications and their degree of aromaticity. The promise of the use of soot + graphite carbon composition for the Mechanochemical Synthesis of titanium carbide is mentioned. It has been shown that titanium carbide synthesized according to this technology has high sorption activity.
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FEATURES OF Mechanochemical Synthesis OF TUNGSTEN AND TITANIUM CARBIDES WITH PARTICIPATION OF NATURAL GRAPHITE
Refractories and Industrial Ceramics, 2020Co-Authors: V. P. Reva, D. V. OnishchenkoAbstract:It is established that the ash content of natural graphite is the main limiting factor in implementing Mechanochemical Synthesis of titanium carbide in the system Ti–Cgr and tungsten carbide in the system WO3–Mg–Cgr. The promising nature of using a carbon black composition + natural graphite for reducing sulfur content in titanium carbide prepared by Mechanochemical Synthesis is demonstrated.
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Mechanochemical Synthesis of tungsten carbide with the participation of various carbon components
Russian Journal of Non-ferrous Metals, 2020Co-Authors: V. P. Reva, D. V. OnishchenkoAbstract:It is established that the main criteria for implementing the Mechanochemical Synthesis of tungsten carbide are the structure of modifications of carbon and their degree of aromaticity. Prospects for using modifications of carbon fabricated by the pyrolysis of vegetable raw materials are shown.
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Factors influencing the Mechanochemical Synthesis of tungsten and titanium carbides
Russian Metallurgy, 2020Co-Authors: D. V. Onishchenko, V. P. RevaAbstract:Nanometer-sized tungsten monocarbide and titanium carbide are produced by mechanical activation. The formation of the former carbide is shown to be promoted by the introduction of polymethylmethacrylate into the initial charge for synthesizing tungsten carbide. It is found that the main limiting factors of the Mechanochemical Synthesis in the titanium-carbon system are the structure of carbon modifications and the degree of their aromaticity.
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Specifics of the Mechanochemical Synthesis of titanium and tungsten carbides from various carbon components
Russian Journal of Physical Chemistry B, 2020Co-Authors: V. P. Reva, D. V. OnishchenkoAbstract:It is established that the main limiting factor in the implementation of Mechanochemical Synthesis in the Ti + C and WO3 + Mg + C systems is the degree of aromaticity of the carbon ingredient. The possibility of using carbon modifications produced by pyrolysis of plant raw materials for the Synthesis of the respective carbides with a minimum sulfur content.
Allan H White - One of the best experts on this subject based on the ideXlab platform.
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The role of short-range diffusion in solvent-assisted Mechanochemical Synthesis of metal complexes
Dalton Transactions, 2008Co-Authors: Graham A Bowmaker, Brian W Skelton, John V. Hanna, Robert D. Hart, Allan H WhiteAbstract:The role of short-range diffusion in solvent-assisted Mechanochemical Synthesis is demonstrated in studies of a polymorphic transition and a ligand dissociation reaction involving copper(I) thiocyanate complexes.
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solvent assisted Mechanochemical Synthesis of metal complexes
Dalton Transactions, 2008Co-Authors: Graham A Bowmaker, Narongsak Chaichit, Chaveng Pakawatchai, Brian W Skelton, Allan H WhiteAbstract:The application of solvent-assisted Mechanochemical Synthesis to the study of metal complex formation is illustrated by examples involving complexes of silver halides with ethylenethiourea.
Graham A Bowmaker - One of the best experts on this subject based on the ideXlab platform.
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The role of short-range diffusion in solvent-assisted Mechanochemical Synthesis of metal complexes
Dalton Transactions, 2008Co-Authors: Graham A Bowmaker, Brian W Skelton, John V. Hanna, Robert D. Hart, Allan H WhiteAbstract:The role of short-range diffusion in solvent-assisted Mechanochemical Synthesis is demonstrated in studies of a polymorphic transition and a ligand dissociation reaction involving copper(I) thiocyanate complexes.
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solvent assisted Mechanochemical Synthesis of metal complexes
Dalton Transactions, 2008Co-Authors: Graham A Bowmaker, Narongsak Chaichit, Chaveng Pakawatchai, Brian W Skelton, Allan H WhiteAbstract:The application of solvent-assisted Mechanochemical Synthesis to the study of metal complex formation is illustrated by examples involving complexes of silver halides with ethylenethiourea.
Tadej Rojac - One of the best experts on this subject based on the ideXlab platform.
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Mechanochemical Synthesis of NaNbO3, KNbO3 and
2020Co-Authors: Tadej Rojac, M. Kosec, Barbara Malič, Janez HolcAbstract:Mechanochemical Synthesis of the K0.5Na0.5NbO3 solid solution (KNN) is studied. In order to explore the Mechanochemical interactions between the constituents in the Na2CO3 - K2CO3 - Nb2O5 system, NaNbO3 and KNbO3 as the boundary compositions of the KNN solid solution are also studied. It has been shown that NaNbO3 can be prepared by a single-step Mechanochemical Synthesis, while in the case of K2CO3 and Nb2O5, and Na2CO3, K2CO3 and Nb2O5 mixtures, only amorphisation occurs even after prolonged milling.
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Mechanochemical Synthesis of complex ceramic oxides
High-Energy Ball Milling, 2020Co-Authors: Tadej Rojac, M. KosecAbstract:Abstract: Mechanochemical Synthesis has recently been recognized as a promising method for synthesizing a variety of technologically important ceramic oxides with complex compositions. This chapter begins by presenting some recent results related to the mechanisms and kinetics of Mechanochemical reactions in oxide systems. In the second part of the chapter, attention is turned to the literature data on direct Mechanochemical Synthesis and the Mechanochemical activation-based Synthesis of a variety of complex oxides having different properties. This includes ferroelectric oxides and related materials, magnetic oxides and oxides with semiconducting and catalytic properties.
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Mechanochemical Synthesis of NaNbO3, KNbO3 and K0.5Na0.5NbO3
Science of Sintering, 2020Co-Authors: Tadej Rojac, M. Kosec, Barbara Malič, Janez HolcAbstract:Mechanochemical Synthesis of the K0.5Na0.5NbO3 solid solution (KNN) is studied. In order to explore the Mechanochemical interactions between the constituents in the Na2CO3 - K2CO3 - Nb2O5 system, NaNbO3 and KNbO3 as the boundary compositions of the KNN solid solution are also studied. It has been shown that NaNbO3 can be prepared by a single-step Mechanochemical Synthesis, while in the case of K2CO3 and Nb2O5, and Na2CO3, K2CO3 and Nb2O5 mixtures, only amorphisation occurs even after prolonged milling.
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The application of a milling map in the Mechanochemical Synthesis of ceramic oxides
Journal of The European Ceramic Society, 2020Co-Authors: Tadej Rojac, Barbara Malič, M. Kosec, Janez HolcAbstract:Abstract We have evaluated the use of a milling map in the Mechanochemical Synthesis of ceramic oxides. In order to do this we constructed a milling map for NaNbO 3 , Mechanochemically synthesized from a powder mixture of Na 2 CO 3 and Nb 2 O 5 . Based on the milling map, we determined the critical or minimum cumulative kinetic energy for the formation of NaNbO 3 . In addition, we made a comparison between several oxide systems by constructing the milling map on the basis of the experimental data found in the literature. It is shown that a milling map is essential for a comparison of the results of Mechanochemical Synthesis when different planetary mills and milling conditions are used.
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The Mechanochemical Synthesis of NaNbO3 Using Different Ball‐Impact Energies
Journal of the American Ceramic Society, 2008Co-Authors: Tadej Rojac, M. Kosec, Barbara Malič, Janez HolcAbstract:We studied the Mechanochemical Synthesis of NaNbO3 from a starting-powder mixture of sodium carbonate and Nb2O5 using ball-impact energies of 15 and 370 mJ/hit. Based on the results of a quantitative phase analysis we propose a mechanism for the Mechanochemical Synthesis of NaNbO3. During milling a condition is established, where the amounts of perovskite, X-ray diffraction -amorphous phase and residual carbonate in the mixture do not change with increasing milling time. Similarly, the NaNbO3 crystallite size and the quantity of microstrains reach final values that are independent of the applied ball-impact energy.