Kinetics of thermal expansion of illite-based ceramics in the dehydroxylation region during heating

Kinetic analysis of illite dehydroxylation from differential scanning calorimetry

“…The value of Avrami peak factor indicates diffusion controlled growth of the new phase with zero or decreasing nucleation rate [9]. This value is different from the results in [5], however, the diffusion controlled process was also found to be a dominant mechanism of this step. After determining the value of kinetic exponent n the value of A can be calculated.…”

“…Thermogravimetric experiments show that this process proceeds in two overlapping steps. The most probable explanation seems to be that the individual steps correspond to dehydroxylation of trans-vacant (tv) and cis-vacant (cv) illite layers [5]. The values of apparent activation energy for tvand cv-layer dehydroxylation show considerable variations.…”

“…For this reason, the further systematic study of these processes is required. Thermodilatometric analysis (TDA) 119 184 [5] The aim of this study is the kinetic analysis of illite dehydroxylation. From the results of differential scanning calorimetry (DSC) the values of apparent activation energy and pre-exponential factor were calculated by the Kissinger method.…”

Mechanical properties of illite‐based ceramics with controlled porosity studied by modern in situ techniques

“…Therefore, it allows to study the properties of illite in a relatively pure form, devoid of the influence of other phases such as kaolinite, quartz, and feldspars, which are typically present in natural clays in considerably high quantities. There are only a limited number of works investigating this material and these studies focus primarily on the thermo‐physical properties of illite …”

“…There are only a limited number of works investigating this material and these studies focus primarily on the thermo-physical properties of illite. 2,15,16,[18][19][20][21][22][23][24][25][26][27][28] Moreover in this work, a controlled porosity was introduced into IRC using a sacrificial template method, thus obtaining sample sets with various degrees of porosity. Mechanical properties of IRC and their dependence on the level of porosity were investigated using conventional compression tests combined with modern in situ acoustic emission (AE) and digital image correlation (DIC) techniques, which proved to be particularly effective for the examination of deformation dynamics, investigated up to now mostly in porous or dense metallic and composite materials, see Refs.…”