TY  - JOUR
AU  - Kamberović, Željko
AU  - Filipović, Dušica
AU  - Raić, Karlo
AU  - Tasić, Miloš
AU  - Anđić, Zoran
AU  - Gavrilovski, Milorad
PY  - 2011
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5081
AB  - The reduction of WO3 with hydrogen in a vertical tube reactor is a new approach to the reduction of tungsten oxide compared to conventional procedures in a stationary layer. The advantage of this method is the intensive contact between the reducent and the oxide particles, a higher degree and a shorter time of reduction of only a few seconds, compared to the several hours processing time in a horizontal tube reactor.
The characterization of the WO3 powder and of the tungsten powder included a SEM  microstructural examination and DT/TG analyses. The SEM examination of the tungsten powder indicates the presence of small particles with a size of about 1 μm, also within an agglomerated porous foam structure. Tungsten powder with a particle size of less than 1 μm is obtained at an optimal temperature with a suitable flow of hydrogen, as a result of stretching and the cracking of large particles, first in the reaction zone, and then, due to appropriate shock of the temperature, outside of this zone.
Using an appropriate mathematical model, the degree of reduction and the time required for the formation of tungsten particles during the hydrogen reduction of WO3 in a vertical tube reactor were determined. Experimental studies have shown that the degree of reduction of WO3 with hydrogen in a vertical tube reactor increases with the temperature and the flow of hydrogen.
PB  - Institute of Metals and Technology, Ljubljana, Slovenia
T2  - Materials and Technology
T1  - Reduction of ultra fine tungsten powder with tungsten(VI)-oxide in a vertical tube reactor
VL  - 45
IS  - 1
SP  - 27
EP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5081
ER  - 

@article{
author = "Kamberović, Željko and Filipović, Dušica and Raić, Karlo and Tasić, Miloš and Anđić, Zoran and Gavrilovski, Milorad",
year = "2011",
abstract = "The reduction of WO3 with hydrogen in a vertical tube reactor is a new approach to the reduction of tungsten oxide compared to conventional procedures in a stationary layer. The advantage of this method is the intensive contact between the reducent and the oxide particles, a higher degree and a shorter time of reduction of only a few seconds, compared to the several hours processing time in a horizontal tube reactor.
The characterization of the WO3 powder and of the tungsten powder included a SEM  microstructural examination and DT/TG analyses. The SEM examination of the tungsten powder indicates the presence of small particles with a size of about 1 μm, also within an agglomerated porous foam structure. Tungsten powder with a particle size of less than 1 μm is obtained at an optimal temperature with a suitable flow of hydrogen, as a result of stretching and the cracking of large particles, first in the reaction zone, and then, due to appropriate shock of the temperature, outside of this zone.
Using an appropriate mathematical model, the degree of reduction and the time required for the formation of tungsten particles during the hydrogen reduction of WO3 in a vertical tube reactor were determined. Experimental studies have shown that the degree of reduction of WO3 with hydrogen in a vertical tube reactor increases with the temperature and the flow of hydrogen.",
publisher = "Institute of Metals and Technology, Ljubljana, Slovenia",
journal = "Materials and Technology",
title = "Reduction of ultra fine tungsten powder with tungsten(VI)-oxide in a vertical tube reactor",
volume = "45",
number = "1",
pages = "27-32",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5081"
}

Kamberović, Ž., Filipović, D., Raić, K., Tasić, M., Anđić, Z.,& Gavrilovski, M.. (2011). Reduction of ultra fine tungsten powder with tungsten(VI)-oxide in a vertical tube reactor. in Materials and Technology
Institute of Metals and Technology, Ljubljana, Slovenia., 45(1), 27-32.
https://hdl.handle.net/21.15107/rcub_cherry_5081

Kamberović Ž, Filipović D, Raić K, Tasić M, Anđić Z, Gavrilovski M. Reduction of ultra fine tungsten powder with tungsten(VI)-oxide in a vertical tube reactor. in Materials and Technology. 2011;45(1):27-32.
https://hdl.handle.net/21.15107/rcub_cherry_5081 .

Kamberović, Željko, Filipović, Dušica, Raić, Karlo, Tasić, Miloš, Anđić, Zoran, Gavrilovski, Milorad, "Reduction of ultra fine tungsten powder with tungsten(VI)-oxide in a vertical tube reactor" in Materials and Technology, 45, no. 1 (2011):27-32,
https://hdl.handle.net/21.15107/rcub_cherry_5081 .