Typical problems in push-rod dilatometry analysis

Jankula, Miroslav; Šín, Peter; Podoba, Rudolf; Ondruška, Ján

doi:10.14382/epitoanyag-jsbcm.2013.3

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…Thermal expansion was measured with horizontal push-rod dilatometer [11]. The temperature interval from room temperature up to 1150 °C with a heating rate of 5 °C/min and from 1150 °C down to room temperature with a cooling rate of 5 °C/min was used.…”

Section: Samples and Measurement Methodsmentioning

confidence: 99%

Study of the illite-kaolinite-CaCO₃ mixtures during firing

Mikušová,

Húlan,

Lukáč

et al. 2023

J. Phys.: Conf. Ser.

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The raw materials used in traditional ceramics include highly plastic clay minerals such as illite or kaolinite. Non-plastic materials are usually added to the mixtures, which affect their workability and sintering process. The formation of a new crystalline phase (e.g. anorthite) is often observed in mixtures that contain a large amount of CaO. The improvement of final properties of ceramic materials is attributed to the formation of anorthite. The aim of this paper is to study the firing of anorthite ceramics in the system illite-kaolinite-CaCO3. Four sets of samples with different illite:kaolinite ratio (8:2, 6:4, 4:6, 2:8), and with a constant addition of CaCO3 are produced. The samples were subjected to the thermal and structural analyses. A significant mass loss is observed for all studied samples during the process of dehydroxylation and decomposition of CaCO3. An exothermic peak around 950 °C, which is connected with the formation of anorthite, is observed during differential thermal analysis. Above this temperature, no significant length changes are recorded. The presence of anorthite is confirmed by XRD analysis. The most formation of anorthite is observed in the illite-kaolinite sample with ratio 8:2.

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Section: Samples and Measurement Methodsmentioning

confidence: 99%

Study of the illite-kaolinite-CaCO₃ mixtures during firing

Mikušová,

Húlan,

Lukáč

et al. 2023

J. Phys.: Conf. Ser.

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“…Differential thermal analysis (DTA) and thermogravimetry (TG) of the compact samples (∅14 × 16 mm) with a mass of 3.5 g were performed by means of a Derivatograph 1000 analyzer (MOM Budapest, Budapest, Hungary) [46], in which a pressed alumina reference sample with similar dimensions to the studied sample was used. Thermodilatometry (TDA) was carried out using a horizontal pushrod alumina dilatometer [47] on samples with dimensions of ∅14 × 35 mm. All measurements were performed in the temperature interval from 30 to 1100 • C in static air atmosphere at a heating rate of 5…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2021

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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%.

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“…The TD was performed on a horizontal push-rod alumina dilatometer ( cf. Jankula et al , 2013) on green samples with dimensions of 11 mm × 11 mm × 25 mm.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2019

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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.

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Typical problems in push-rod dilatometry analysis

Cited by 19 publications

References 3 publications

Study of the illite-kaolinite-CaCO₃ mixtures during firing

Study of the illite-kaolinite-CaCO₃ mixtures during firing

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

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

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Typical problems in push-rod dilatometry analysis

Cited by 19 publications

References 3 publications

Study of the illite-kaolinite-CaCO3 mixtures during firing

Study of the illite-kaolinite-CaCO3 mixtures during firing

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

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

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Product

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Study of the illite-kaolinite-CaCO₃ mixtures during firing

Study of the illite-kaolinite-CaCO₃ mixtures during firing