Young’s modulus of illitic clay in the temperature region of quartz transition

Húlan, Tomáš; Štubňa, Igor; Kaljuvee, Tiit; Knapek, Michal

doi:10.1007/s10973-021-11083-9

Cited by 1 publication

(2 citation statements)

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“…After a linear decrease, f0 increased at ~573 °C due to quartz modification transition. The further decrease of f0 and the increase of δ are attributed to the dehydroxylation of illite [16]. At 733 °C, f0 reached its local minima and δ its local maxima.…”

Section: Measurement Examplementioning

confidence: 95%

“…At 573 °C, a deteriorating effect of quartz was manifested during cooling. Due to the extraordinary temperature dependence of the elastic properties of quartz during its modification transition [17] and because of the rapid change in its thermal expansion coefficient, the course of f0 showed its typical V-shaped minima followed by a substantial decrease [16]. The modification transition of quartz was also reflected in δ.…”

Section: Measurement Examplementioning

confidence: 99%

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The Apparatus for Thermomechanical Analysis of Clay-based Ceramics

Húlan

Štubňa

Al-Shantir

et al. 2023

Measurement Science Review

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A dynamic thermomechanical analysis (D-TMA) apparatus is described for measuring the resonant frequency of the flexural vibration and the internal damping of the sample using the impulse excitation technique (IET). Since the measurement is conducted at temperatures up to 1250 °C, an electromagnetic impulser is used for excitation. The free vibrations are registered by an electret microphone, stored and then converted into a frequency spectrum using the fast Fourier transform, from which the resonant frequency can be found. The furnace is built from refractory porous alumina bricks and alumina fiber pads. The heating elements are four SiC rods connected to a temperature controller. The temperature is measured with a Pt-PtRh10 thermocouple in close proximity to the sample.

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Section: Measurement Examplementioning

confidence: 95%

Section: Measurement Examplementioning

confidence: 99%