Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics
| Autor: | Darko Kosanović, Nina Obradović, Ljubiša Andrić, Vladimir B. Pavlović, Antonije Đorđević, Jovica Stojanović, Anja Terzić |
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| Rok vydání: | 2019 |
| Předmět: |
Thermogravimetric analysis
Materials science Sintering MgO 02 engineering and technology Thermal treatment 01 natural sciences Crystallinity 0103 physical sciences Materials Chemistry Ceramic Composite material Ball mill 010302 applied physics microstructure-final sintering electron microscopy Process Chemistry and Technology 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials Grain growth dielectric properties visual_art Ceramics and Composites visual_art.visual_art_medium insulators 0210 nano-technology X-ray methods |
| Zdroj: | Ceramics International |
| Popis: | Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources – talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 °C and holding period conducted at 1250 °C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period. This is the peer reviewed version of the following article: Terzić, A., Obradović, N., Kosanović, D., Stojanović, J., Đorđević, A., Andrić, L., Pavlović, V.B., 2019. Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. Ceramics International 45, 3013–3022. [https://doi.org/10.1016/j.ceramint.2018.10.120] Published version: [https://hdl.handle.net/21.15107/rcub_dais_4635] |
| Databáze: | OpenAIRE |
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