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Influence of mechanochemical activation on the sintering of cordierite ceramics in the presence of Bi2O3 as a functional additive

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2012
Authors
Obradović, Nina
Đorđević, Nataša
Filipović, Suzana
Nikolić, N.
Kosanović, Darko
Mitrić, Miodrag
Marković, Smilja
Pavlović, Vladimir B.
Article (Published version)
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Abstract
Due to its outstanding electrical characteristics, such as the low temperature expansion coefficient, low dielectric constant and good mechanical properties, cordierite, 2MgO⋅2Al2O3⋅ 5SiO2, is a very attractive high-temperature ceramic material. In order to accelerate the process of sintering, 2.50 mass% Bi2O3 has been added to the starting mixtures. Liquid phase sintering caused by the presence of bismuth-oxide lowers the temperature of cordierite formation. The mechanical activation of the starting mixtures (0–56 min in vibro-mill) additionally lowers sintering temperatures. The sintering process was performed at 1200, 1300, 1350 and 1400 °C, for 2 h. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders and sintered materials was analyzed by the X-ray diffraction method. Furthermore, scanning electron microscopy (SEM) was used in the analysis of the powde...r morphology.

Keywords:
mechanical activation / sintering / X-ray / SEM / cordierite
Source:
Powder Technology, 2012, 157-161
Publisher:
  • Elsevier
Projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)

DOI: 10.1016/j.powtec.2011.12.012

ISSN: 0032-5910

WoS: 000300526400023

Scopus: 2-s2.0-84855854130
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URI
http://dais.sanu.ac.rs/123456789/485
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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