The influence of texture on elastic and thermophysical properties of kaolin- and illite-based ceramic bodies

Antal, Daniel; Húlan, Tomáš; Štubňa, Igor; Záleská, Martina; Trník, Anton

doi:10.1016/j.ceramint.2016.11.100

Cited by 19 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior is compatible with that observed by Garcia‐Ten and Escardino et al, who studied porous ceramic tiles. The decomposition of the clay minerals is also compatible with results reported by Arab et al and Antal et al . In addition, it was observed that the initial and final temperatures changed with the heating rate and were also dependent on the type of sample.…”

Section: Resultssupporting

confidence: 91%

Effect of specimen geometry on kinetics of thermal decomposition of minerals in porous ceramic tiles

Cargnin

Kammer

Souza

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Porous ceramic tiles are used as covering for indoor vertical surfaces in buildings. Clay and limestone are the starting raw materials. The firing step consolidates the product's properties in the manufacturing process. In this step several reactions occur, among them are the dehydroxylation of the clay minerals and decomposition of the carbonates. This study determined the kinetics parameters associated with the decomposition of these 2 minerals. Two different methods of samples preparation were investigated. In the first method, 60 mg of a spray‐dried powder was submitted to analysis in traditional thermogravimetric equipment. In the second method, compacted specimens with dimensions of 80 × 20 × 2.5 mm³ and a mass of 7 g, compacted at 25 MPa, were submitted to analysis using customized thermogravimetric apparatus. The curves were obtained for 6 different heating rates between 2.5 and 20 K min−1. The activation energy, the pre‐exponential factor of the specific velocity equation, and the reaction mechanism were determined. Depending on the methods and compaction degree the activation energy varies from 177.0 to 224.7 kJ mol−1 and from 188.5 to 230.2 kJ mol−1 for kaolinite and calcium carbonate, respectively. For accurate measurement of the activation energy, the heat transfer needs to be considered for each particular experimental configuration.

show abstract

Section: Resultssupporting

confidence: 91%

Effect of specimen geometry on kinetics of thermal decomposition of minerals in porous ceramic tiles

Cargnin

Kammer

Souza

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…The reason is that zeolite does not have OH − ions in the matrix structure. The DTA, DSC, and TG results of kaolin and natural zeolite are very similar to the results presented in [21,26,49]. In these studies, the mass losses of the kaolinite subgroup and clinoptilolite are in good agreement with our results.…”

Section: Thermogravimetric Analysissupporting

confidence: 91%

Thermophysical Properties of Kaolin–Zeolite Blends up to 1100 °C

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this study, the thermophysical properties such as the thermal expansion, thermal diffusivity and conductivity, and specific heat capacity of ceramic samples made from kaolin and natural zeolite are investigated up to 1100 °C. The samples were prepared from Sedlec kaolin (Czech Republic) and natural zeolite (Nižný Hrabovec, Slovakia). Kaolin was partially replaced with a natural zeolite in the amounts of 10, 20, 30, 40, and 50 mass%. The measurements were performed on cylindrical samples using thermogravimetric analysis, a horizontal pushrod dilatometer, and laser flash apparatus. The results show that zeolite in the samples decreases the values of all studied properties (except thermal expansion), which is positive for bulk density, porosity, thermal diffusivity, and conductivity. It has a negative effect for thermal expansion because shrinkage increases with the zeolite content. Therefore, the optimal amount of zeolite in the sample (according to the studied properties) is 30 mass%.

show abstract

“…Although the values are correlated and sometimes similar, the lattice thermal expansion coefficients can only be extrapolated accurately for a macroscopic body in the case of an isotropic single crystal. However, Proton Conducting Ceramics (PCCs) are predominantly polycrystalline materials, exhibiting different microstructures and thermal expansion coefficients can for instance be affected by the grain size [53,54] and texturing effects [55,56]. It becomes even more complicated for a composite material, consisting of two or more different material phases.…”

Section: Significance and Relation Between Bulk And Lattice Expansionmentioning

confidence: 99%

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

2018

View full text Add to dashboard Cite

This review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points of view while the chemical expansion is explained based on crystallography and defect chemistry. Modelling methods are used to predict the thermochemical expansion of PCCs and MIECs with two examples: hydration of barium zirconate (BaZr1−xYxO3−δ) and oxidation/reduction of La1−xSrxCo0.2Fe0.8O3−δ. While it is unusual for a review paper, we conducted experiments to evaluate the influence of the heating rate in determining expansion coefficients experimentally. This was motivated by the discrepancy of some values in literature. The conclusions are that the heating rate has little to no effect on the obtained values. Models for the expansion coefficients of a composite material are presented and include the effect of porosity. A set of data comprising thermal and chemical expansion coefficients has been gathered from the literature and presented here divided into two groups: protonic electrolytes and mixed ionic-electronic conductors. Finally, the methods of mitigation of the thermal mismatch problem are discussed.

show abstract

The influence of texture on elastic and thermophysical properties of kaolin- and illite-based ceramic bodies

Cited by 19 publications

References 14 publications

Effect of specimen geometry on kinetics of thermal decomposition of minerals in porous ceramic tiles

Effect of specimen geometry on kinetics of thermal decomposition of minerals in porous ceramic tiles

Thermophysical Properties of Kaolin–Zeolite Blends up to 1100 °C

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

Contact Info

Product

Resources

About