TY  - JOUR
AU  - Bošković, Snežana B.
AU  - Kosanovic, D
AU  - Zec, Slavica
PY  - 2001
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2465
AB  - Densification as well as the alpha -- GT beta phase transformation of Si3N4 were monitored as a function of activation time of the BaCO3-Al2O3-SiO2 additive mixture. The composition of the ternary mixture corresponded to celsian (BaAl2Si2O8-BAS). Previously, mechanically activated powder mixtures for various lengths of time were added to Si3N4 in the amount of 10-30%. Sintering was performed at 1650-1700 degreesC in nitrogen atmosphere up to 8 h. The changes in densification degree, as well as phase composition, were followed as a function of heating time and the time of mechanical activation of the additive mixture. The results obtained showed that mechanical activation retarded densification in samples heated up to 1700 degreesC. On the other hand, for the constant sintering time, alpha -- GT beta transformation of Si3N4, was enhanced with increasing activation time, and the amount of additives. (C) 2001 Elsevier Science B.V. All rights reserved.
T2  - Powder Technology
T1  - Densification and phase transformation of Si3N4 in the presence of mechanically activated BaCO3-Al2O3-SiO2 mixture
VL  - 120
IS  - 3
SP  - 194
EP  - 198
DO  - 10.1016/S0032-5910(01)00270-4
ER  - 

@article{
author = "Bošković, Snežana B. and Kosanovic, D and Zec, Slavica",
year = "2001",
abstract = "Densification as well as the alpha -- GT beta phase transformation of Si3N4 were monitored as a function of activation time of the BaCO3-Al2O3-SiO2 additive mixture. The composition of the ternary mixture corresponded to celsian (BaAl2Si2O8-BAS). Previously, mechanically activated powder mixtures for various lengths of time were added to Si3N4 in the amount of 10-30%. Sintering was performed at 1650-1700 degreesC in nitrogen atmosphere up to 8 h. The changes in densification degree, as well as phase composition, were followed as a function of heating time and the time of mechanical activation of the additive mixture. The results obtained showed that mechanical activation retarded densification in samples heated up to 1700 degreesC. On the other hand, for the constant sintering time, alpha -- GT beta transformation of Si3N4, was enhanced with increasing activation time, and the amount of additives. (C) 2001 Elsevier Science B.V. All rights reserved.",
journal = "Powder Technology",
title = "Densification and phase transformation of Si3N4 in the presence of mechanically activated BaCO3-Al2O3-SiO2 mixture",
volume = "120",
number = "3",
pages = "194-198",
doi = "10.1016/S0032-5910(01)00270-4"
}

Bošković, S. B., Kosanovic, D.,& Zec, S.. (2001). Densification and phase transformation of Si3N4 in the presence of mechanically activated BaCO3-Al2O3-SiO2 mixture. in Powder Technology, 120(3), 194-198.
https://doi.org/10.1016/S0032-5910(01)00270-4

Bošković SB, Kosanovic D, Zec S. Densification and phase transformation of Si3N4 in the presence of mechanically activated BaCO3-Al2O3-SiO2 mixture. in Powder Technology. 2001;120(3):194-198.
doi:10.1016/S0032-5910(01)00270-4 .

Bošković, Snežana B., Kosanovic, D, Zec, Slavica, "Densification and phase transformation of Si3N4 in the presence of mechanically activated BaCO3-Al2O3-SiO2 mixture" in Powder Technology, 120, no. 3 (2001):194-198,
https://doi.org/10.1016/S0032-5910(01)00270-4 . .

TY  - JOUR
AU  - Bošković, Snežana B.
AU  - Kosanovic, D
AU  - Dondur, Vera
AU  - Dimitrijevic, R
PY  - 2000
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2298
AB  - The synthesis of Si3N4-celsian composite materials was studied in this paper. To obtain celsian, two different types of additives were used. In the first case the appropriate mixture of BaCO3, Al2O3 and SiO2 was added to Si3N4, while in the second case a Ba-A-zeolite, previously heated at 850 degrees C, was used as an additive. Mixtures of Si3N4 and the sintering aids were homogenized in a vibratory mill in the presence of isopropanol. The green bodies were pressurelessly sintered in nitrogen atmosphere at temperatures of 1650-1750 degrees C. Densification degree was followed, as well as microstructural changes, as a function of the sintering conditions and the additive used. Reaction of BAS formation was followed by X-ray analysis during the heating up period. It was found that with 10% zeolite as a sintering aid, full densification was achieved at 1750 degrees C but with the same amount of oxide mixture, only 96% TD was attained. Phase changes were followed also during cooling down the samples from sintering temperature. Two crystalline phases, beta-Si3N4 and hexacelsian, were present in both types of sintered samples. (C) 1999 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis of Si3N4-celsian composite materials
VL  - 26
IS  - 1
SP  - 33
EP  - 37
DO  - 10.1016/S0272-8842(99)00016-4
ER  - 

@article{
author = "Bošković, Snežana B. and Kosanovic, D and Dondur, Vera and Dimitrijevic, R",
year = "2000",
abstract = "The synthesis of Si3N4-celsian composite materials was studied in this paper. To obtain celsian, two different types of additives were used. In the first case the appropriate mixture of BaCO3, Al2O3 and SiO2 was added to Si3N4, while in the second case a Ba-A-zeolite, previously heated at 850 degrees C, was used as an additive. Mixtures of Si3N4 and the sintering aids were homogenized in a vibratory mill in the presence of isopropanol. The green bodies were pressurelessly sintered in nitrogen atmosphere at temperatures of 1650-1750 degrees C. Densification degree was followed, as well as microstructural changes, as a function of the sintering conditions and the additive used. Reaction of BAS formation was followed by X-ray analysis during the heating up period. It was found that with 10% zeolite as a sintering aid, full densification was achieved at 1750 degrees C but with the same amount of oxide mixture, only 96% TD was attained. Phase changes were followed also during cooling down the samples from sintering temperature. Two crystalline phases, beta-Si3N4 and hexacelsian, were present in both types of sintered samples. (C) 1999 Elsevier Science Ltd and Techna S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis of Si3N4-celsian composite materials",
volume = "26",
number = "1",
pages = "33-37",
doi = "10.1016/S0272-8842(99)00016-4"
}

Bošković, S. B., Kosanovic, D., Dondur, V.,& Dimitrijevic, R.. (2000). Synthesis of Si3N4-celsian composite materials. in Ceramics International, 26(1), 33-37.
https://doi.org/10.1016/S0272-8842(99)00016-4

Bošković SB, Kosanovic D, Dondur V, Dimitrijevic R. Synthesis of Si3N4-celsian composite materials. in Ceramics International. 2000;26(1):33-37.
doi:10.1016/S0272-8842(99)00016-4 .

Bošković, Snežana B., Kosanovic, D, Dondur, Vera, Dimitrijevic, R, "Synthesis of Si3N4-celsian composite materials" in Ceramics International, 26, no. 1 (2000):33-37,
https://doi.org/10.1016/S0272-8842(99)00016-4 . .

TY  - JOUR
AU  - Bošković, Snežana B.
AU  - Kosanovic, D
AU  - Bahloul-Hourlier, D
AU  - Thomas, P
AU  - Kiss, Sandor J.
PY  - 1999
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2274
AB  - A ternary mixture BaCO3-Al2O3-SiO2 was mechanically activated for different lengths of time. Chemical composition of the mixture corresponded to BaAl2Si2O8-BAS As a function of activation time, reaction course was followed in the temperature range 750-1200 degrees C. Reaction of celsian formation was followed using thermogravimetry as well as conventional and high-temperature X-ray diffractometry. The obtained data show that reaction rate increases with prolonged activation time, under the same conditions of thermal treatment. Formation of hexacelsian via a series of solid state reactions involving Ba-silicates, was favoured with increasing activation time. Direct formation of monoclinic celsian was retarded, however, with prolonged activation, (C) 1999 Elsevier Science S.A. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Formation of celsian from mechanically activated BaCO3-Al2O3-SiO2 mixtures
VL  - 290
IS  - 1-2
SP  - 230
EP  - 235
DO  - 10.1016/S0925-8388(99)00091-2
ER  - 

@article{
author = "Bošković, Snežana B. and Kosanovic, D and Bahloul-Hourlier, D and Thomas, P and Kiss, Sandor J.",
year = "1999",
abstract = "A ternary mixture BaCO3-Al2O3-SiO2 was mechanically activated for different lengths of time. Chemical composition of the mixture corresponded to BaAl2Si2O8-BAS As a function of activation time, reaction course was followed in the temperature range 750-1200 degrees C. Reaction of celsian formation was followed using thermogravimetry as well as conventional and high-temperature X-ray diffractometry. The obtained data show that reaction rate increases with prolonged activation time, under the same conditions of thermal treatment. Formation of hexacelsian via a series of solid state reactions involving Ba-silicates, was favoured with increasing activation time. Direct formation of monoclinic celsian was retarded, however, with prolonged activation, (C) 1999 Elsevier Science S.A. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Formation of celsian from mechanically activated BaCO3-Al2O3-SiO2 mixtures",
volume = "290",
number = "1-2",
pages = "230-235",
doi = "10.1016/S0925-8388(99)00091-2"
}

Bošković, S. B., Kosanovic, D., Bahloul-Hourlier, D., Thomas, P.,& Kiss, S. J.. (1999). Formation of celsian from mechanically activated BaCO3-Al2O3-SiO2 mixtures. in Journal of Alloys and Compounds, 290(1-2), 230-235.
https://doi.org/10.1016/S0925-8388(99)00091-2

Bošković SB, Kosanovic D, Bahloul-Hourlier D, Thomas P, Kiss SJ. Formation of celsian from mechanically activated BaCO3-Al2O3-SiO2 mixtures. in Journal of Alloys and Compounds. 1999;290(1-2):230-235.
doi:10.1016/S0925-8388(99)00091-2 .

Bošković, Snežana B., Kosanovic, D, Bahloul-Hourlier, D, Thomas, P, Kiss, Sandor J., "Formation of celsian from mechanically activated BaCO3-Al2O3-SiO2 mixtures" in Journal of Alloys and Compounds, 290, no. 1-2 (1999):230-235,
https://doi.org/10.1016/S0925-8388(99)00091-2 . .