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Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA

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Abstract

Since cordierite, 2MgO·2Al2O3·5SiO2 (MAS), is a very useful high-temperature ceramic material, it is important to decrease its sintering temperature. In order to accelerate the process of sintering, 5.00 mass% MoO3 was added to the starting mixtures. The mechanical activation of the starting mixtures was performed in a high-energy ball mill in time intervals from 0 to 160 min. After the activation, starting mixtures were sintered at 1300 °C for 2 h. In order to determine the impact of mechanical activation on particle size distribution and powders morphology, the mechanically treated powders were characterized by a laser light-scattering particle size analyzer and scanning electron microscopy. The phase composition of the starting mixtures and sintered samples was analyzed by the X-ray diffraction method. In order to determine temperature intervals of chemical reactions and phase transitions, differential thermal analyses (DTA) and thermo-gravimetric analysis were used. Kissinger’s equation was employed to calculate apparent activation energies of various processes that occur within the system during heating. Based on the obtained DTA results, it was established that mechanical activation along with MoO3 additive has influence on sintering temperature which was decreased for more than 100 °C, comparing to the literature data.

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Acknowledgements

This research was performed within the project 172057, funded by the Ministry for education, science and research development of the Republic of Serbia and project F-7/II funded by the Serbian Academy of Sciences and Arts.

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Authors and Affiliations

  1. Institute of Technical Sciences of SASA, Knez Mihailova 35/IV, Belgrade, 11000, Serbia

    Nina Obradović, Suzana Filipović, Smilja Marković, Darko Kosanović & Vladimir Pavlović

  2. Institute for Technology of Nuclear and Other Mineral Raw Materials, Bulevar Franse d′Eperea 86, Belgrade, 11000, Serbia

    Nataša Đorđević

  3. Vinča Institute of Nuclear Sciences, University of Belgrade, Mike Alasa 12-14, Belgrade, 11000, Serbia

    Miodrag Mitrić

Authors
  1. Nina Obradović
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  2. Nataša Đorđević
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  3. Suzana Filipović
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  4. Smilja Marković
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  5. Darko Kosanović
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  6. Miodrag Mitrić
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  7. Vladimir Pavlović
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Correspondence to Nina Obradović.

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Obradović, N., Đorđević, N., Filipović, S. et al. Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA. J Therm Anal Calorim 124, 667–673 (2016). https://doi.org/10.1007/s10973-015-5132-9

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  • DOI: https://doi.org/10.1007/s10973-015-5132-9

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