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 .

TY  - JOUR
AU  - Anđić, Zoran
AU  - Korać, Marija
AU  - Tasić, Miloš
AU  - Kamberović, Željko
AU  - Raić, Karlo
PY  - 2007
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5337
AB  - By hydrometallurgy and powder metallurgy along with prognosis of physicalchemical
properties, a synthesis of new improved materials can be successfully
performed with in advance pre-set properties which is conditioned by a quality of
starting powders i.e. by improving their structure. In accordance with that, this paper
presents synthesis of the nanocomposite Cu-Al2O3 powder by thermochemical method
and sintering with a comparative analysis of the mechanical and electrical properties of
obtained solid samples. Nanocrystaline Cu-Al2O3 powders were produced by
thermochemical method through following stages: spray-drying, oxidation of precursor
powder, reduction by hydrogen and homogenisation. Characterization of powders
included differential-thermal and thermo-gravimetric analysis (DTA-TGA), X-raydiffraction
(XRD) and analytical electron microscopy (AEM) coupled with energetic
dispersive spectroscopy (EDS). Size of produced powders was 20-50nm with noticable
presence of agglomerates. Composite powders are characterized with Al2O3 homogenous
distribution in copper matrix. Powders were cold pressed with pressure of 500 MPa and
sintered. Sintering of the obtained samples was performed in the hydrogen atmosphere in
isothermal conditions at temperature range from 800 to 900oC and time up to 120
minutes. Characterization of Cu-Al2O3 sintered system included examination of density,
relative volume change, electrical and mechanical properties, examination of
microstructure by SEM analysis, as well as by EDS. The obtained nanocomposite, which
structure is with certain changes preserved in final structure, has provided sintered
material with homogenous distribution of dispersoide in copper matrix, with exceptional
effects of reinforcing and excellent combination of mechanical and electrical properties.
PB  - Association of Metallurgical Engineers of Serbia AMES
T2  - Metalurgija - Journal of Metallurgy
T1  - Synthesis and  sintering of Cu-Al2O3 nanocomposite powders produced by a thermochemical route
VL  - 13
IS  - 1
SP  - 71
EP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5337
ER  - 

@article{
author = "Anđić, Zoran and Korać, Marija and Tasić, Miloš and Kamberović, Željko and Raić, Karlo",
year = "2007",
abstract = "By hydrometallurgy and powder metallurgy along with prognosis of physicalchemical
properties, a synthesis of new improved materials can be successfully
performed with in advance pre-set properties which is conditioned by a quality of
starting powders i.e. by improving their structure. In accordance with that, this paper
presents synthesis of the nanocomposite Cu-Al2O3 powder by thermochemical method
and sintering with a comparative analysis of the mechanical and electrical properties of
obtained solid samples. Nanocrystaline Cu-Al2O3 powders were produced by
thermochemical method through following stages: spray-drying, oxidation of precursor
powder, reduction by hydrogen and homogenisation. Characterization of powders
included differential-thermal and thermo-gravimetric analysis (DTA-TGA), X-raydiffraction
(XRD) and analytical electron microscopy (AEM) coupled with energetic
dispersive spectroscopy (EDS). Size of produced powders was 20-50nm with noticable
presence of agglomerates. Composite powders are characterized with Al2O3 homogenous
distribution in copper matrix. Powders were cold pressed with pressure of 500 MPa and
sintered. Sintering of the obtained samples was performed in the hydrogen atmosphere in
isothermal conditions at temperature range from 800 to 900oC and time up to 120
minutes. Characterization of Cu-Al2O3 sintered system included examination of density,
relative volume change, electrical and mechanical properties, examination of
microstructure by SEM analysis, as well as by EDS. The obtained nanocomposite, which
structure is with certain changes preserved in final structure, has provided sintered
material with homogenous distribution of dispersoide in copper matrix, with exceptional
effects of reinforcing and excellent combination of mechanical and electrical properties.",
publisher = "Association of Metallurgical Engineers of Serbia AMES",
journal = "Metalurgija - Journal of Metallurgy",
title = "Synthesis and  sintering of Cu-Al2O3 nanocomposite powders produced by a thermochemical route",
volume = "13",
number = "1",
pages = "71-81",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5337"
}

Anđić, Z., Korać, M., Tasić, M., Kamberović, Ž.,& Raić, K.. (2007). Synthesis and  sintering of Cu-Al2O3 nanocomposite powders produced by a thermochemical route. in Metalurgija - Journal of Metallurgy
Association of Metallurgical Engineers of Serbia AMES., 13(1), 71-81.
https://hdl.handle.net/21.15107/rcub_cherry_5337

Anđić Z, Korać M, Tasić M, Kamberović Ž, Raić K. Synthesis and  sintering of Cu-Al2O3 nanocomposite powders produced by a thermochemical route. in Metalurgija - Journal of Metallurgy. 2007;13(1):71-81.
https://hdl.handle.net/21.15107/rcub_cherry_5337 .

Anđić, Zoran, Korać, Marija, Tasić, Miloš, Kamberović, Željko, Raić, Karlo, "Synthesis and  sintering of Cu-Al2O3 nanocomposite powders produced by a thermochemical route" in Metalurgija - Journal of Metallurgy, 13, no. 1 (2007):71-81,
https://hdl.handle.net/21.15107/rcub_cherry_5337 .

TY  - JOUR
AU  - Anđić, Zoran
AU  - Korać, Marija
AU  - Tasić, Miloš
AU  - Raić, Karlo
AU  - Kamberović, Željko
PY  - 2006
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5049
AB  - Contemporary materials with predetermined properties can be successfully synthesized by
utilizing the principles of hydrometallurgy and powder metallurgy. The results of developing
a new procedure for the synthesis of ultrafine and nanocomposite powders based on copper,
silver and alumina are presented in this paper. A two-component nanocomposite powder,
Cu-Al2O3, was synthesized by a thermochemical procedure, by deposition from an aqueous
solution of soluble metal salts, Cu(NO3)2 and Al(NO3)3. A three-component Cu-Ag-Al2O3
powder was produced by mechanically alloying nanocomposite Cu-Al2O3 powder and Cu-Ag
powder, synthesized by the thermochemical procedure. The produced powders were characterized
by determining the particle specific area, pouring density and fluidness, differential
thermal and thermogravimetric analysis (DTA-TGA), X-ray diffraction (XRD) and scanning
electron microscopy (SEM).
PB  - Kovove materialy
T2  - Kovove materialy
T1  - The synthesis of ultra fine and nanocomposite powders based on copper, silver and alumina
VL  - 44
IS  - 3
SP  - 145
EP  - 150
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5049
ER  - 

@article{
author = "Anđić, Zoran and Korać, Marija and Tasić, Miloš and Raić, Karlo and Kamberović, Željko",
year = "2006",
abstract = "Contemporary materials with predetermined properties can be successfully synthesized by
utilizing the principles of hydrometallurgy and powder metallurgy. The results of developing
a new procedure for the synthesis of ultrafine and nanocomposite powders based on copper,
silver and alumina are presented in this paper. A two-component nanocomposite powder,
Cu-Al2O3, was synthesized by a thermochemical procedure, by deposition from an aqueous
solution of soluble metal salts, Cu(NO3)2 and Al(NO3)3. A three-component Cu-Ag-Al2O3
powder was produced by mechanically alloying nanocomposite Cu-Al2O3 powder and Cu-Ag
powder, synthesized by the thermochemical procedure. The produced powders were characterized
by determining the particle specific area, pouring density and fluidness, differential
thermal and thermogravimetric analysis (DTA-TGA), X-ray diffraction (XRD) and scanning
electron microscopy (SEM).",
publisher = "Kovove materialy",
journal = "Kovove materialy",
title = "The synthesis of ultra fine and nanocomposite powders based on copper, silver and alumina",
volume = "44",
number = "3",
pages = "145-150",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5049"
}

Anđić, Z., Korać, M., Tasić, M., Raić, K.,& Kamberović, Ž.. (2006). The synthesis of ultra fine and nanocomposite powders based on copper, silver and alumina. in Kovove materialy
Kovove materialy., 44(3), 145-150.
https://hdl.handle.net/21.15107/rcub_cherry_5049

Anđić Z, Korać M, Tasić M, Raić K, Kamberović Ž. The synthesis of ultra fine and nanocomposite powders based on copper, silver and alumina. in Kovove materialy. 2006;44(3):145-150.
https://hdl.handle.net/21.15107/rcub_cherry_5049 .

Anđić, Zoran, Korać, Marija, Tasić, Miloš, Raić, Karlo, Kamberović, Željko, "The synthesis of ultra fine and nanocomposite powders based on copper, silver and alumina" in Kovove materialy, 44, no. 3 (2006):145-150,
https://hdl.handle.net/21.15107/rcub_cherry_5049 .