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The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics

Authorized Users Only
2019
Authors
Obradović, Nina
Fahrenholtz, William G.
Filipović, Suzana
Kosanović, Darko
Dapčević, A.
Đorđević, Antonije
Balać, Igor
Pavlović, Vladimir B.
Article (Accepted Version)
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Abstract
Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scan...ning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.

Keywords:
electrical properties / mechanical activation / mechanical properties / microstructure / sintering / spinel
Source:
Ceramics International, 2019, 45, 9, 12015-12021
Publisher:
  • Elsevier
Projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
  • Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (RS-45007)
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)
Note:
  • This is the peer-reviewed version of the article: Obradović, Nina, W. G. Fahrenholtz, Suzana Filipović, Darko Kosanović, A. Dapčević, Antonije Đorđević, Igor Balać, and Vladimir B. Pavlović. 2019. “The Effect of Mechanical Activation on Synthesis and Properties of MgAl2O4 Ceramics.” Ceramics International, https://doi.org/10.1016/j.ceramint.2019.03.095

DOI: 10.1016/j.ceramint.2019.03.095

ISBN: 0272-8842

WoS: 000466253500111

Scopus: 2-s2.0-85062915610
[ Google Scholar ]
6
7
URI
http://www.sciencedirect.com/science/article/pii/S0272884219306340
http://dais.sanu.ac.rs/123456789/5272
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, A.
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219306340
UR  - http://dais.sanu.ac.rs/123456789/5272
AB  - Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Elsevier
T2  - Ceramics International
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
SP  - 12015
EP  - 12021
VL  - 45
IS  - 9
DO  - 10.1016/j.ceramint.2019.03.095
ER  - 
@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, A. and Đorđević, Antonije and Balać, Igor and Pavlović, Vladimir B.",
year = "2019",
url = "http://www.sciencedirect.com/science/article/pii/S0272884219306340, http://dais.sanu.ac.rs/123456789/5272",
abstract = "Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "12015-12021",
volume = "45",
number = "9",
doi = "10.1016/j.ceramint.2019.03.095"
}
Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Đorđević A, Balać I, Pavlović VB. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. Ceramics International. 2019;45(9):12015-12021
Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Đorđević, A., Balać, I.,& Pavlović, V. B. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics.
Ceramics InternationalElsevier., 45(9), 12015-12021. 
https://doi.org/10.1016/j.ceramint.2019.03.095
Obradović Nina, Fahrenholtz William G., Filipović Suzana, Kosanović Darko, Dapčević A., Đorđević Antonije, Balać Igor, Pavlović Vladimir B., "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" 45, no. 9 (2019):12015-12021,
https://doi.org/10.1016/j.ceramint.2019.03.095 .

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