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1. SHS in South Korea

Author

Nersisyan, Hayk, primary, Il Won, Hyong, additional, Won, Chang Whan, additional, and Lee, Jong Hyeon, additional

Published
2017
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2. Contributors

Author

Abdulkarimova, Roza G., primary, Agote, Iñigo, additional, Aleksanyan, Anahit G., additional, Alkan, Murat, additional, Alymov, Mikhail I., additional, Amosov, Alexander P., additional, Aruna, Singanahally T., additional, Balashov, Vladimir B., additional, Baras, Florence, additional, Barinova, Tatiana V., additional, Bernard, Frédéric, additional, Bichurov, Georgy V., additional, Borovinskaya, Inna P., additional, Borshch, Vyacheslav N., additional, Braverman, Boris Sh., additional, Cao, Giacomo, additional, Chukhlomina, Ludmila N., additional, Dolukhanyan, Seda K., additional, Fomenko, Sergey M., additional, Fu, Zhengyi, additional, Gabbasov, Ramil M., additional, Golosov, Evgeny V., additional, Gotman, Irena, additional, Gromov, Alexander A., additional, Gutiérrez, Manuel, additional, Gutmanas, Elasar Y., additional, Ignatieva, Tatyana I., additional, Il Won, Hyong, additional, Itin, Volya I., additional, Ivanov, Mikhail B., additional, Ivanova, Oksana V., additional, Kasatsky, Nikolay G., additional, Khabas, Tamara A., additional, Kharatyan, Suren L., additional, Khina, Boris B., additional, Kirdyashkin, Alexander I., additional, Klimchuk, Evgeny G., additional, Kolobov, Yury R., additional, Konovalihin, Sergey V., additional, Konyashin, Igor’ Yu., additional, Kovalev, Dmitry Y., additional, Kovalev, Dmitry Yu., additional, Krishenik, Peter M., additional, Ksandopulo, Georgiy I., additional, Kudryashov, Alexander E., additional, Kulak, Mikhail M., additional, Kurbatkina, Victoria V., additional, Lagos, Miguel A., additional, Lapshin, Oleg V., additional, Lavrenchuk, Galina V., additional, Lee, Jong Hyeon, additional, Lepakova, Olga K., additional, Levashov, Evgeny A., additional, Lis, Jerzy, additional, Maksimov, Yury M., additional, Mansurov, Zulkhair A., additional, Manukyan, Khachatur V., additional, Martirosyan, Karen S., additional, Merzhanov, Alexander G., additional, Minin, Roman V., additional, Mofa, Nina N., additional, Mukasyan, Alexander S., additional, Nayborodenko, Yury S., additional, Nersisyan, Hayk, additional, Odawara, Osamu, additional, Onashvilli, Giorgi, additional, Orrù, Roberto, additional, Patsera, Evgeny I., additional, Pauls, Joshua M., additional, Pogozhev, Yury S., additional, Ponomarev, Vasiliy I., additional, Potanin, Artem Yu., additional, Prokudina, Valentina К., additional, Puszynski, Jan A., additional, Radishevskaya, Nina I., additional, Raskolenko, Larisa G., additional, Rodríguez, Miguel A., additional, Rogachev, Alexander S., additional, Salamatov, Vitaly G., additional, Salamatov, Vitaliy G., additional, Sanin, Vladimir N., additional, Sargsyan, Ara, additional, Scheck, Yury B., additional, Shiriev, Anatoly A., additional, Shkadinsky, Konstantin G., additional, Shtansky, Dmitry V., additional, Shuck, Christopher E., additional, Smirnov, Konstantin L., additional, Stolin, Alexander M., additional, Sytschev, Alexander E., additional, Takacs, Laszlo, additional, Tarasenko, Viktor F., additional, Trifonov, Boris V., additional, Turan, Ahmet, additional, Uvarov, Valery I., additional, Vereshchagin, Vladimir I., additional, Vershinnikov, Vladimir I., additional, Weihs, Timothy P., additional, Won, Chang Whan, additional, Xanthopoulou, Galina G., additional, Yücel, Onuralp, additional, Yukhvid, Vladimir I., additional, Zakorzhevsky, Vladimir V., additional, and Zelepugin, Sergey A., additional

Published
2017
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11. The Effect of Adittives on the Sintering Properties of Barium Titanate Powder Prepared by Self-propagating High-temperature Synthesis

Author

Lim Sung-Jae, Won Hyung-Il, Won Chang-Whan, and Shin Chang-Yun

Subjects
chemistry.chemical_compound, Materials science, chemistry, Metallurgy, Barium titanate, Self-propagating high-temperature synthesis, Sintering, Curie temperature, Grain boundary, Dielectric, Composite material, Porosity, Ceramic capacitor
Abstract

In this study, high purity fine powders were prepared by SHS (Self-propagating High-temperature Synthesis). We would examinate the study of sintering properties and characteristics as a function of temperature with various additives (binder, sintering agent). In separately binder addition, the green and sintered density of specimen were increased as binder content increases. The increased porosity resulted in fine grain size due to the inhibition of grain boundary moving. The and MgO playa role of increasing dielectric constants at room temperature. These values were decreased at curie temperature. In case of , the Curie temperature was decreased. In this study, a high dielectric ceramic capacitor material with temperature stability was synthesized by using various additives.

Published
2006

12. Preparation of α-Si3N4Powder in Reaction System Containing Molten Salt by SHS - Part 2. Scale-Up

Author

Yang Beom Seok, Yun Ki Seok, Park Young Cheol, and Won Chang Whan

Subjects
Materials science, Chemical engineering, Ceramics and Composites, Reaction system, Molten salt
Abstract

앞선 논문 분말의 제조에서 정립한 α-Si₃N₄ 분말의 제조를 위한 최적의 조성에서 반응 혼합물의 양에 따른 압력 및 생성물의 변화를 관찰하였다. 5L 반응기 내에서 반응 혼합물의 양이 100g 일 때 필요한 최저 N₂ 압력은 60 atm이었다. 그러나 반응 혼합물의 양이 200g 이상일 때부터 반응기 내부의 압력 증가로 인해 반응은 완료될 수 없었으며, 혼합물이 증가할수록 반응율은 직선적으로 감소하였다. 반응물의 양이 증가할수록 최초 반응기 내부의 N₂ 압력을 감소시킴으로써 반응을 완료시킬 수 있었으며, 500g일 때 초기 N₂ 압력을 약 20 atm까지 감소시킴으로써 반응은 완료될 수 있었다. 반응이 중간에 멈추는 원인은 반응기 내부의 압력 증가로 인해 기화되지 못한 채 혼합물 안에 존재한 NH₄Cl 때문인 것으로 밝혀졌다.

Published
2004

13. Correction

Author

Chang, Dae Kyu, Won, Chang Whan, Chun, Byung Sun, and Shim, Gun Choo

Published
1995
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35. Synthesis and Characteristic of BaMgAl10O17:Eu2+ Phosphor by SHS

Author

Kim Byeong Beom, Park Yeong Cheol, Lee Jong Eun, and Won Chang Whan

Subjects
Mole ratio, Materials science, Analytical chemistry, Mineralogy, Metal powder, General Materials Science, Phosphor, Reaction velocity, Luminescence, Combustion
Abstract

for PDP blue phosphor was synthesized using SHS(Self-propagating High temperature Synthesis) method. While Al metal powder was oxidized in this combustion, was reduced to Eu2+. Therefore the mole ratio of is one of the most important variable of the reaction. When is 2.5/3.75, it has not only appropriate temperature and reaction velocity, but also excellent luminescent property. The sample synthesized in this system has similar characteristics comparing to sample using conventional solid-state reaction.

Published
2004

36. Effect of Zn and Mn on the Synthesis of Zn2SiO4:Mn2+ Phosphor by SHS

Author

Lee Hyeok Hui, Lee Jong Eun, Won Chang Whan, and Kim Byeong Beom

Subjects
Mole ratio, Materials science, Pellet, Metallurgy, Analytical chemistry, Metal powder, General Materials Science, Phosphor
Abstract

【The synthesis of $Zn_{2}SiO_4:Mn^{2+}$ for PDP green phosphor by SHS(Self-propagating High temperature Synthesis method) was studied. The precursors were well mixed and cold compacted. And then, the green pellet was synthesized at high temperature through self-propagating high temperature zone. Because this reaction uses the heat resulted from the oxidation of Zn metal powder in this system, Zn/ZnO mole ratio is one of the most important reaction variable. Throughout several experiments, the optimal condition of Zn/ZnO mole ratio and Mn concentration are 1.2/0.8 and 0.05mo1e, respectively.】

Published
2004

37. Preparation of tungsten by the self-propagating high-temperature synthesis (SHS) process.

Author

Ko Seog Gueon, 2nd international symposium on metallurgical processes for the year 2000 and beyond and the 1994 TMS Extraction and process metallurgy meeting San Diego, California 20-Sep-9423-Sep-94, Chun Byong Sun, Sohn H.Y., Won Chang Whan, Ko Seog Gueon, 2nd international symposium on metallurgical processes for the year 2000 and beyond and the 1994 TMS Extraction and process metallurgy meeting San Diego, California 20-Sep-9423-Sep-94, Chun Byong Sun, Sohn H.Y., and Won Chang Whan

Abstract

High-purity tungsten was prepared by the self-propagating high temperature synthesis process from a mixture of WO3 and Mg. The MgO in the product was leached with HCl solution. The complete reduction of WO3 required a 33% excess of magnesium over the stoichiometric Mg:WO3 molar ratio of 3. The tungsten produced had a purity of 99.980% which was higher than those of the reactants. This is because the impurities are volatilised at the high temperatures generated during the rapid exothermic reaction and dissolved into the HCl solution during leaching., High-purity tungsten was prepared by the self-propagating high temperature synthesis process from a mixture of WO3 and Mg. The MgO in the product was leached with HCl solution. The complete reduction of WO3 required a 33% excess of magnesium over the stoichiometric Mg:WO3 molar ratio of 3. The tungsten produced had a purity of 99.980% which was higher than those of the reactants. This is because the impurities are volatilised at the high temperatures generated during the rapid exothermic reaction and dissolved into the HCl solution during leaching.

Published
1994

44. Combustion Synthesis of Molybdenum Disilicide (MoSi2) Fine Powders.

Author

Nersisyan, Hayk H., Won, Hyung Il, and Won, Chang Whan

Subjects
SILICON compounds, MOLYBDENUM, SELF-propagating high-temperature synthesis, METAL powder combustion, HALIDE minerals
Abstract

The combustion characteristics of a MoO3+SiO2+Mg system diluted with sodium chloride have been studied in order to synthesize molybdenum disilicide (MoSi2) fine powders. The effect of processing variables, including the sodium chloride content and the reactants proportion on the phase composition and microstructure of the final products, was obtained. Both the combustion temperature and the wave velocity decreased with an increase in the amount of sodium chloride. With the appropriate processing parameters, the reacted product consisted of solid crystalline MoSi2, and an MgO phase was prepared in the molten sodium halide matrix at 1100°–1350°C. The final product purification resulted in MoSi2 powder with a particle size of 100–500 nm. The mechanism of the MoSi2 formation in the sodium chloride matrix is discussed by analyzing the phase evaluation in the extinguished combustion wave. [ABSTRACT FROM AUTHOR]

Published
2008
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45. Simultaneous synthesis and densification of NiAl and Ni3Al by pressure-assisted combustion.

Author

Lee, Jong-Hyeon, Jung, Joong-Chai, Won, Chang-Whan, and Shon, In-Jin

Subjects
SELF-propagating high-temperature synthesis, NICKEL-aluminum alloys, INTERMETALLIC compounds, MATERIALS compression testing, COMBUSTION research, POROSITY
Abstract

Simultaneous synthesis and densification of NiAl and Ni3Al from elemental powders of Ni and Al was investigated. Combustion synthesis was carried out under the uniaxial compressive pressure and preheating of die. It was shown that both the compressive pressure and preheating of die strongly affect the density, the grain size and the hardness of NiAl and Ni3Al product. A high relative density of NiAl and Ni3Al products as much as 99.8% was achieved under compressive pressure of 275 MPa and preheating temperature of 600°C. [ABSTRACT FROM AUTHOR]

Published
2002
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50. A macrokinetic study of the WO3/Zn reaction diluted with NaCl

Author

Won, Hyung Il., Nersisyan, Hayk. H., and Won, Chang Whan

Subjects
*TUNGSTEN oxides, *NANOSTRUCTURED materials, *MIXTURES, *ZINC, *CHEMICAL reactions, *STOICHIOMETRY, *DILUTION, *SALT, *COMBUSTION
Abstract

Abstract: In this work, experiments with stoichiometric WO3 +3Zn mixture, diluted with NaCl, were conducted for nanostructured tungsten synthesis. The reaction samples, preheated until 720K, were self-ignited and reacted in the steady combustion regime. The temperature–time profiles in the combustion wave were collected over the NaCl interval from 1 to 6mol, and the values of the combustion parameters (T c , U c ) were evaluated. From these profiles the spatial distributions of heat generation rate ϕ(x) and degree of conversion η(x) in the combustion wave were received at different k values. The calculated activation energy for the combustion process was E =55±2kJmol−1. After the reduction experiments, pure tungsten nanopowder with particle size from 200 to 50nm was obtained depending on NaCl concentration. [Copyright &y& Elsevier]

Published
2009
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