TY  - JOUR
AU  - Đorđević, Nataša
AU  - Mihajlović, Slavica
AU  - Vlahović, Milica
AU  - Lozanović Šajić, Jasmina
AU  - Martinović, Sanja
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3766
AB  - Sodium carbonate is a well-known material for being used as a good sorbent of carbon dioxide from the atmosphere, and as such has gained increasing importance in environmental protection. In order to enhance its sorption ability, mechanochemical activation of sodium carbonate was carried out in this study while the occurred changes after the activation and the relaxation time in a controlled environment were monitored. Activation was performed in a vibro-mill from 1 to 28 min. Based on the results of specific surface area, obtained by BET, the samples activated for 2 and 7 min were chosen and placed in a moist carbon dioxide atmosphere for 96 h, a period called the relaxation time. Differential thermal and thermogravimetric analyses were applied with the aim of determining the changes that occurred on the activated samples during the relaxation period. The decomposition temperature change of activated Na2CO3 samples, as well as mass loss and conversion level of Na2CO3 to NaHCO3 were monitored depending on activation and relaxation time periods. The conversion reactions of sodium carbonate to sodium bicarbonate under the specified environment of carbon dioxide and moisture were also studied, and the thermodynamic data such are changes in enthalpy, entropy, and Gibbs energy at the temperature range of 0-160 degrees C are given.
PB  - Elsevier, Amsterdam
T2  - Thermochimica Acta
T1  - Thermal analysis and phase changes of mechanochemically activated sodium carbonate
VL  - 708
DO  - 10.1016/j.tca.2021.179139
ER  - 

@article{
author = "Đorđević, Nataša and Mihajlović, Slavica and Vlahović, Milica and Lozanović Šajić, Jasmina and Martinović, Sanja",
year = "2022",
abstract = "Sodium carbonate is a well-known material for being used as a good sorbent of carbon dioxide from the atmosphere, and as such has gained increasing importance in environmental protection. In order to enhance its sorption ability, mechanochemical activation of sodium carbonate was carried out in this study while the occurred changes after the activation and the relaxation time in a controlled environment were monitored. Activation was performed in a vibro-mill from 1 to 28 min. Based on the results of specific surface area, obtained by BET, the samples activated for 2 and 7 min were chosen and placed in a moist carbon dioxide atmosphere for 96 h, a period called the relaxation time. Differential thermal and thermogravimetric analyses were applied with the aim of determining the changes that occurred on the activated samples during the relaxation period. The decomposition temperature change of activated Na2CO3 samples, as well as mass loss and conversion level of Na2CO3 to NaHCO3 were monitored depending on activation and relaxation time periods. The conversion reactions of sodium carbonate to sodium bicarbonate under the specified environment of carbon dioxide and moisture were also studied, and the thermodynamic data such are changes in enthalpy, entropy, and Gibbs energy at the temperature range of 0-160 degrees C are given.",
publisher = "Elsevier, Amsterdam",
journal = "Thermochimica Acta",
title = "Thermal analysis and phase changes of mechanochemically activated sodium carbonate",
volume = "708",
doi = "10.1016/j.tca.2021.179139"
}

Đorđević, N., Mihajlović, S., Vlahović, M., Lozanović Šajić, J.,& Martinović, S.. (2022). Thermal analysis and phase changes of mechanochemically activated sodium carbonate. in Thermochimica Acta
Elsevier, Amsterdam., 708.
https://doi.org/10.1016/j.tca.2021.179139

Đorđević N, Mihajlović S, Vlahović M, Lozanović Šajić J, Martinović S. Thermal analysis and phase changes of mechanochemically activated sodium carbonate. in Thermochimica Acta. 2022;708.
doi:10.1016/j.tca.2021.179139 .

Đorđević, Nataša, Mihajlović, Slavica, Vlahović, Milica, Lozanović Šajić, Jasmina, Martinović, Sanja, "Thermal analysis and phase changes of mechanochemically activated sodium carbonate" in Thermochimica Acta, 708 (2022),
https://doi.org/10.1016/j.tca.2021.179139 . .

TY  - JOUR
AU  - Pavlović, Marko
AU  - Andrić, Ljubiša
AU  - Radulović, Dragan
AU  - Drmanić, Saša
AU  - Đorđević, Nataša
AU  - Petrov, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7447
AB  - For the development of the Lost Foam refractory coatings with controlled rheologic properties, the influence of the mechanical activation process on the cordierite-based filler's properties change was examined. First of all, the test referred to the change offiller particles' size and shape, as well as to dispersion ability and stability of the coating suspension. Cordierite was obtained by synthesis in a solid state, out of the mass consisting of kaoline, alumina, quartz, sepiolite. For characterization purposes, the following methods were used: X-ray diffraction, differential thermal analysis, SEM and optical microscopy. Mechanical activation of filler was performed in a vibrating mill. The upper boundary of the grain size was 100% -30 x 10-6 m, the times were (min): 15; 30; 60. The new composition of Lost foam refractory coatings has been developed with a change of the coating production process, as well. These newly synthesized coatings proved to be effective in terms of a positive influence on a surface quality, structural and mechanical properties of aluminium castings. Test results may be useful to have the Lost Foam refractory coatings specified together with other process parameters used for the production of castings according to this casting method.
T2  - Science of Sintering
T1  - Influence of 	Mechanical Activation of a Cordierite –Based Filler on Sedimentation Stability of Lost 	Foam Refractory Coatings
EP  - 25
IS  - 1
SP  - 15
VL  - 51
DO  - 10.2298/SOS1901015P
ER  - 

@article{
author = "Pavlović, Marko and Andrić, Ljubiša and Radulović, Dragan and Drmanić, Saša and Đorđević, Nataša and Petrov, Milan",
year = "2019",
abstract = "For the development of the Lost Foam refractory coatings with controlled rheologic properties, the influence of the mechanical activation process on the cordierite-based filler's properties change was examined. First of all, the test referred to the change offiller particles' size and shape, as well as to dispersion ability and stability of the coating suspension. Cordierite was obtained by synthesis in a solid state, out of the mass consisting of kaoline, alumina, quartz, sepiolite. For characterization purposes, the following methods were used: X-ray diffraction, differential thermal analysis, SEM and optical microscopy. Mechanical activation of filler was performed in a vibrating mill. The upper boundary of the grain size was 100% -30 x 10-6 m, the times were (min): 15; 30; 60. The new composition of Lost foam refractory coatings has been developed with a change of the coating production process, as well. These newly synthesized coatings proved to be effective in terms of a positive influence on a surface quality, structural and mechanical properties of aluminium castings. Test results may be useful to have the Lost Foam refractory coatings specified together with other process parameters used for the production of castings according to this casting method.",
journal = "Science of Sintering",
title = "Influence of 	Mechanical Activation of a Cordierite –Based Filler on Sedimentation Stability of Lost 	Foam Refractory Coatings",
pages = "25-15",
number = "1",
volume = "51",
doi = "10.2298/SOS1901015P"
}

Pavlović, M., Andrić, L., Radulović, D., Drmanić, S., Đorđević, N.,& Petrov, M.. (2019). Influence of 	Mechanical Activation of a Cordierite –Based Filler on Sedimentation Stability of Lost 	Foam Refractory Coatings. in Science of Sintering, 51(1), 15-25.
https://doi.org/10.2298/SOS1901015P

Pavlović M, Andrić L, Radulović D, Drmanić S, Đorđević N, Petrov M. Influence of 	Mechanical Activation of a Cordierite –Based Filler on Sedimentation Stability of Lost 	Foam Refractory Coatings. in Science of Sintering. 2019;51(1):15-25.
doi:10.2298/SOS1901015P .

Pavlović, Marko, Andrić, Ljubiša, Radulović, Dragan, Drmanić, Saša, Đorđević, Nataša, Petrov, Milan, "Influence of 	Mechanical Activation of a Cordierite –Based Filler on Sedimentation Stability of Lost 	Foam Refractory Coatings" in Science of Sintering, 51, no. 1 (2019):15-25,
https://doi.org/10.2298/SOS1901015P . .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Mitrić, Miodrag
AU  - Pavlović, Vera P.
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2022
AB  - Cordierite (MAS) is difficult to sinter because of the very narrow sintering temperature range (1300-1400°C). Because a low temperature process is desirable, it is necessary to find functional ads which can allow easier sintering process at lower temperature. The influence of MoO3 on the preparation process of cordierite ceramics was investigated. 2MgO-2Al2O3-5SiO2 was researched by sintering followed binary systems: MgO/MoO3, Al2O3/MoO3 and SiO2/MoO3 (all sintered at 850°C and 1100°C, sintering time 2h). Composition of these systems was 80 mass% of oxide and 20 mass% MoO3. The effects of sintering, the composition and morphology were followed by X-ray diffraction and SEM microscopy. It has been found that MoO3, beside liquid phase, forms intermediary unstable compounds with MgO and Al2O3, which is the significance information for further research. MAS ceramics were sintered with 20 mass% MoO3 at 1100°C, 1200°C and 1300°C, during 2h.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis
EP  - 313
IS  - 3
SP  - 307
VL  - 46
DO  - 10.2298/SOS1403307D
ER  - 

@article{
author = "Đorđević, Nataša and Obradović, Nina and Kosanović, Darko and Mitrić, Miodrag and Pavlović, Vera P.",
year = "2014",
abstract = "Cordierite (MAS) is difficult to sinter because of the very narrow sintering temperature range (1300-1400°C). Because a low temperature process is desirable, it is necessary to find functional ads which can allow easier sintering process at lower temperature. The influence of MoO3 on the preparation process of cordierite ceramics was investigated. 2MgO-2Al2O3-5SiO2 was researched by sintering followed binary systems: MgO/MoO3, Al2O3/MoO3 and SiO2/MoO3 (all sintered at 850°C and 1100°C, sintering time 2h). Composition of these systems was 80 mass% of oxide and 20 mass% MoO3. The effects of sintering, the composition and morphology were followed by X-ray diffraction and SEM microscopy. It has been found that MoO3, beside liquid phase, forms intermediary unstable compounds with MgO and Al2O3, which is the significance information for further research. MAS ceramics were sintered with 20 mass% MoO3 at 1100°C, 1200°C and 1300°C, during 2h.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis",
pages = "313-307",
number = "3",
volume = "46",
doi = "10.2298/SOS1403307D"
}

Đorđević, N., Obradović, N., Kosanović, D., Mitrić, M.,& Pavlović, V. P.. (2014). Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 46(3), 307-313.
https://doi.org/10.2298/SOS1403307D

Đorđević N, Obradović N, Kosanović D, Mitrić M, Pavlović VP. Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis. in Science of Sintering. 2014;46(3):307-313.
doi:10.2298/SOS1403307D .

Đorđević, Nataša, Obradović, Nina, Kosanović, Darko, Mitrić, Miodrag, Pavlović, Vera P., "Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis" in Science of Sintering, 46, no. 3 (2014):307-313,
https://doi.org/10.2298/SOS1403307D . .