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Development of Young's modulus of natural illitic clay during the heating and cooling stages of firing

Published online by Cambridge University Press:  19 July 2019

Tomáš Húlan Open the ORCID record for Tomáš Húlan [Opens in a new window] ,
Igor Štubňa ,
Andrei Shishkin ,
Jurijs Ozolins ,
Štefan Csáki Open the ORCID record for Štefan Csáki [Opens in a new window] ,
Peter Bačík  and
Jana Fridrichová
Tomáš Húlan*
Affiliation:
Department of Physics, Constantine the Philosopher University, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia
Igor Štubňa
Affiliation:
Department of Physics, Constantine the Philosopher University, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia
Andrei Shishkin
Affiliation:
Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, Riga, LV-1007, Latvia
Jurijs Ozolins
Affiliation:
Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, Riga, LV-1007, Latvia
Štefan Csáki
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic Institute of Plasma Physics, Czech Academy of Sciences, Za Slovankou 3, Prague, 182 00, Czech Republic
Peter Bačík
Affiliation:
Department of Mineralogy and Petrology, Comenius University, Ilkovičova 6, 84215 Bratislava, Slovakia Earth Science Institute of the Slovak Academy of Science, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
Jana Fridrichová
Affiliation:
Department of Mineralogy and Petrology, Comenius University, Ilkovičova 6, 84215 Bratislava, Slovakia
*
*E-mail: thulan@ukf.sk
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Abstract

Illitic clay from the locality of Liepa, Latvia, was investigated using dynamic thermomechanical analysis during the heating and cooling stages of firing. Differential thermal analysis, thermogravimetry, thermodilatometry, X-ray diffraction and porosimetry were also performed to shed light on the processes influencing the elastic properties of clay. The increase in the Young's modulus (YM) at low temperatures was linked to the release of physically bound water. Above 850°C, the bulk density and YM both increased as a consequence of sintering. The YM was more sensitive to the progress of sintering compared to dimension changes. The YM values continued to increase during cooling until the glass-transition temperature was reached. At this temperature, the first microcracks caused by the differences in thermal expansion coefficients of the present phases were expected to appear. The YM showed a sharp V-shaped minimum at the β → α transition of quartz, which was a result of alternation of the mechanical radial stresses around the quartz grains. When the transition of quartz was completed, the YM continued to decrease because microcracks were still being created at the boundaries between the different phases. The decrease of the YM during cooling from the glass-transition temperature down to room temperature was ~50% for all of the firing temperatures and isothermal periods applied.

Keywords

bulk densitydimension changesfiringillitic claymicrocrackingsinteringYoung's modulus
Type
Article
Information
Clay Minerals , Volume 54 , Issue 3 , September 2019 , pp. 229 - 233
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Joao Labrincha

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