TY  - JOUR
AU  - Martinović, S.
AU  - Alil, A.
AU  - Milićević, Sonja
AU  - Živojinović, D.
AU  - Volkov-Husović, Tatjana
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/655
AB  - The pattern recognition approach, explored by this study, applies the principal component analysis (PCA) as the most widely used statistical method with the aim of assessing the initiation and propagation of the cracks and defects that appear on the surface of material exposed to the cavitation. The experiment was performed in four stages: (a) synthesis of two ceramic materials (cordierite and zircon); (b) subjecting the samples to the cavitation; (c) using image analysis software for collecting the data about morphological characteristics that describe defects; (d) principal component analysis as a pattern recognition tool in order to characterize the defects at the material surface. Besides that, according to standard, cavitation erosion was monitored by determining material mass loss during the cavitation. Large experimental datasets collected from morphological descriptors by image analysis are multivariate and difficult to interpret, thus are processed by principal component analysis as the most informative technique for extracting possible differences. The performed approach proved that this method has a great potential for better assessment of induced defects by proper distinguishing among them at different levels and that can be considered a very efficient and cost-effective one.
PB  - Elsevier Ltd
T2  - Engineering Failure Analysis
T1  - Morphological assessment of cavitation caused damage of cordierite and zircon based materials using principal component analysis
VL  - 148
DO  - 10.1016/j.engfailanal.2023.107224
UR  - conv_982
ER  - 

@article{
author = "Martinović, S. and Alil, A. and Milićević, Sonja and Živojinović, D. and Volkov-Husović, Tatjana",
year = "2023",
abstract = "The pattern recognition approach, explored by this study, applies the principal component analysis (PCA) as the most widely used statistical method with the aim of assessing the initiation and propagation of the cracks and defects that appear on the surface of material exposed to the cavitation. The experiment was performed in four stages: (a) synthesis of two ceramic materials (cordierite and zircon); (b) subjecting the samples to the cavitation; (c) using image analysis software for collecting the data about morphological characteristics that describe defects; (d) principal component analysis as a pattern recognition tool in order to characterize the defects at the material surface. Besides that, according to standard, cavitation erosion was monitored by determining material mass loss during the cavitation. Large experimental datasets collected from morphological descriptors by image analysis are multivariate and difficult to interpret, thus are processed by principal component analysis as the most informative technique for extracting possible differences. The performed approach proved that this method has a great potential for better assessment of induced defects by proper distinguishing among them at different levels and that can be considered a very efficient and cost-effective one.",
publisher = "Elsevier Ltd",
journal = "Engineering Failure Analysis",
title = "Morphological assessment of cavitation caused damage of cordierite and zircon based materials using principal component analysis",
volume = "148",
doi = "10.1016/j.engfailanal.2023.107224",
url = "conv_982"
}

Martinović, S., Alil, A., Milićević, S., Živojinović, D.,& Volkov-Husović, T.. (2023). Morphological assessment of cavitation caused damage of cordierite and zircon based materials using principal component analysis. in Engineering Failure Analysis
Elsevier Ltd., 148.
https://doi.org/10.1016/j.engfailanal.2023.107224
conv_982

Martinović S, Alil A, Milićević S, Živojinović D, Volkov-Husović T. Morphological assessment of cavitation caused damage of cordierite and zircon based materials using principal component analysis. in Engineering Failure Analysis. 2023;148.
doi:10.1016/j.engfailanal.2023.107224
conv_982 .

Martinović, S., Alil, A., Milićević, Sonja, Živojinović, D., Volkov-Husović, Tatjana, "Morphological assessment of cavitation caused damage of cordierite and zircon based materials using principal component analysis" in Engineering Failure Analysis, 148 (2023),
https://doi.org/10.1016/j.engfailanal.2023.107224 .,
conv_982 .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Vlahović, M.
AU  - Mihajlović, Slavica
AU  - Martinović, S.
AU  - Vušović, Nenad M.
AU  - Šajić, J.L.
PY  - 2022
UR  - https://ritnms.itnms.ac.rs/handle/123456789/623
AB  - During mechanical activation, qualitative changes that can produce various phenomena occur in the material. In this study, anhydrous sodium carbonate was mechanically activated for 2, 7, 14, and 28 minutes in a vibro mill at a frequency of 3000 oscillations per minute. After activation, four series of activated samples were stored in the air at room conditions for 31 days (relaxation period). To monitor the kinetics of the transformation process of activated sodium carbonate samples, i.e. the mechanism of sodium bicarbonate formation during relaxation, Fourier-transform infrared (FTIR) spectroscopy analysis was used. FTIR testing was performed as a function of relaxation time for all four series of samples, with characteristic groups observed: CO32-, HCO3- and OH-. The obtained results provided kinetics parameters for the transformation of sodium carbonate into sodium bicarbonate due to the chemisorption of moisture and carbon dioxide from the atmosphere.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Fourier-Transform Infrared Spectroscopy Analysis of Mechanochemical Transformation Kinetics of Sodium Carbonate to Bicarbonate
EP  - 494
IS  - 4
SP  - 481
VL  - 54
DO  - 10.2298/SOS2204481D
UR  - conv_1000
ER  - 

@article{
author = "Đorđević, Nataša and Vlahović, M. and Mihajlović, Slavica and Martinović, S. and Vušović, Nenad M. and Šajić, J.L.",
year = "2022",
abstract = "During mechanical activation, qualitative changes that can produce various phenomena occur in the material. In this study, anhydrous sodium carbonate was mechanically activated for 2, 7, 14, and 28 minutes in a vibro mill at a frequency of 3000 oscillations per minute. After activation, four series of activated samples were stored in the air at room conditions for 31 days (relaxation period). To monitor the kinetics of the transformation process of activated sodium carbonate samples, i.e. the mechanism of sodium bicarbonate formation during relaxation, Fourier-transform infrared (FTIR) spectroscopy analysis was used. FTIR testing was performed as a function of relaxation time for all four series of samples, with characteristic groups observed: CO32-, HCO3- and OH-. The obtained results provided kinetics parameters for the transformation of sodium carbonate into sodium bicarbonate due to the chemisorption of moisture and carbon dioxide from the atmosphere.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Fourier-Transform Infrared Spectroscopy Analysis of Mechanochemical Transformation Kinetics of Sodium Carbonate to Bicarbonate",
pages = "494-481",
number = "4",
volume = "54",
doi = "10.2298/SOS2204481D",
url = "conv_1000"
}

Đorđević, N., Vlahović, M., Mihajlović, S., Martinović, S., Vušović, N. M.,& Šajić, J.L.. (2022). Fourier-Transform Infrared Spectroscopy Analysis of Mechanochemical Transformation Kinetics of Sodium Carbonate to Bicarbonate. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 54(4), 481-494.
https://doi.org/10.2298/SOS2204481D
conv_1000

Đorđević N, Vlahović M, Mihajlović S, Martinović S, Vušović NM, Šajić J. Fourier-Transform Infrared Spectroscopy Analysis of Mechanochemical Transformation Kinetics of Sodium Carbonate to Bicarbonate. in Science of Sintering. 2022;54(4):481-494.
doi:10.2298/SOS2204481D
conv_1000 .

Đorđević, Nataša, Vlahović, M., Mihajlović, Slavica, Martinović, S., Vušović, Nenad M., Šajić, J.L., "Fourier-Transform Infrared Spectroscopy Analysis of Mechanochemical Transformation Kinetics of Sodium Carbonate to Bicarbonate" in Science of Sintering, 54, no. 4 (2022):481-494,
https://doi.org/10.2298/SOS2204481D .,
conv_1000 .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Martinović, S.
AU  - Vlahović, M.
AU  - Jovanić, P.
AU  - Vidojković, Velislav M.
AU  - Boljanac, Tamara
PY  - 2009
UR  - https://ritnms.itnms.ac.rs/handle/123456789/158
AB  - Sinterovanjem sistema 2MgO·2Al2O3·5SiO2, dobija se kordijerit, koji zbog svojih svojstava predstavlja izuzetno atraktivan keramički materijal. U cilju ispitivanja mogućnosti sniženja temperature formiranja kordijerita tokom procesa sinterovanja, izvršena su preliminarna ispitivanja mehanohemijske aktivacije stehiometrijske smeše polaznih komponenti. Efekti mehanohemijske aktivacije su praćeni termogravimetrijskom i diferencijalnom termijskom analizom. Specifična površina mehanički aktivirane smeše prahova je određivana BET i Coulter metodom. Kinetika povećanja specifične površine je analizirana tzv. Boltzmann-ovim modelom. Utvrđeno je da se sa povećanjem vremena aktivacije temperature na kojima se uočavaju fazne promene pomeraju ka nižim vrednostima. FFT IR analiza mehanohemijski aktiviranog praha nakon 24 meseci je pokazala da nije došlo do bitnih promena tokom 'starenja' materijala. Na osnovu dobijenih rezultata može se zaključiti da je mehanohemijska aktivacija imala uticaja na tretiranu praškastu smešu, pa se očekuje da se ovaj uticaj odrazi i na sniženje temperature formiranja kordijerita tokom procesa sinterovanja.
AB  - During sintering of the 2MgO-2Al2O3-5SiO2 system, cordierite, an attractive ceramic material because of its properties, is obtained. Effects of mechanochemical activation of stoichiometric mixtures, performed to investigate possibilities of lowering cordierite formation temperature during sintering, were monitored by thermogravimetric and differential thermal analyses. Specific surface areas of the mechanically activated powder mixtures were determined by the BET method. Kinetics of the specific surface area increase was analyzed using the Boltzmann model. It was confirmed that with activation time increase, temperatures of phase transformations were shifted to lower values and, according to FTIR analysis no significant changes occurred during material aging. According to the obtained results, it may be concluded that since mechanochemical activation has an influence on the treated powder mixture, lowering of the cordierite formation temperature during the sintering process is expected.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Kinetics of specific surface area change using the Boltzmann model
EP  - 274
IS  - 3
SP  - 267
VL  - 41
DO  - 10.2298/SOS0903267D
UR  - conv_579
ER  - 

@article{
author = "Đorđević, Nataša and Martinović, S. and Vlahović, M. and Jovanić, P. and Vidojković, Velislav M. and Boljanac, Tamara",
year = "2009",
abstract = "Sinterovanjem sistema 2MgO·2Al2O3·5SiO2, dobija se kordijerit, koji zbog svojih svojstava predstavlja izuzetno atraktivan keramički materijal. U cilju ispitivanja mogućnosti sniženja temperature formiranja kordijerita tokom procesa sinterovanja, izvršena su preliminarna ispitivanja mehanohemijske aktivacije stehiometrijske smeše polaznih komponenti. Efekti mehanohemijske aktivacije su praćeni termogravimetrijskom i diferencijalnom termijskom analizom. Specifična površina mehanički aktivirane smeše prahova je određivana BET i Coulter metodom. Kinetika povećanja specifične površine je analizirana tzv. Boltzmann-ovim modelom. Utvrđeno je da se sa povećanjem vremena aktivacije temperature na kojima se uočavaju fazne promene pomeraju ka nižim vrednostima. FFT IR analiza mehanohemijski aktiviranog praha nakon 24 meseci je pokazala da nije došlo do bitnih promena tokom 'starenja' materijala. Na osnovu dobijenih rezultata može se zaključiti da je mehanohemijska aktivacija imala uticaja na tretiranu praškastu smešu, pa se očekuje da se ovaj uticaj odrazi i na sniženje temperature formiranja kordijerita tokom procesa sinterovanja., During sintering of the 2MgO-2Al2O3-5SiO2 system, cordierite, an attractive ceramic material because of its properties, is obtained. Effects of mechanochemical activation of stoichiometric mixtures, performed to investigate possibilities of lowering cordierite formation temperature during sintering, were monitored by thermogravimetric and differential thermal analyses. Specific surface areas of the mechanically activated powder mixtures were determined by the BET method. Kinetics of the specific surface area increase was analyzed using the Boltzmann model. It was confirmed that with activation time increase, temperatures of phase transformations were shifted to lower values and, according to FTIR analysis no significant changes occurred during material aging. According to the obtained results, it may be concluded that since mechanochemical activation has an influence on the treated powder mixture, lowering of the cordierite formation temperature during the sintering process is expected.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Kinetics of specific surface area change using the Boltzmann model",
pages = "274-267",
number = "3",
volume = "41",
doi = "10.2298/SOS0903267D",
url = "conv_579"
}

Đorđević, N., Martinović, S., Vlahović, M., Jovanić, P., Vidojković, V. M.,& Boljanac, T.. (2009). Kinetics of specific surface area change using the Boltzmann model. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 41(3), 267-274.
https://doi.org/10.2298/SOS0903267D
conv_579

Đorđević N, Martinović S, Vlahović M, Jovanić P, Vidojković VM, Boljanac T. Kinetics of specific surface area change using the Boltzmann model. in Science of Sintering. 2009;41(3):267-274.
doi:10.2298/SOS0903267D
conv_579 .

Đorđević, Nataša, Martinović, S., Vlahović, M., Jovanić, P., Vidojković, Velislav M., Boljanac, Tamara, "Kinetics of specific surface area change using the Boltzmann model" in Science of Sintering, 41, no. 3 (2009):267-274,
https://doi.org/10.2298/SOS0903267D .,
conv_579 .