Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials
| Autor: | Jovica Stojanović, Anja Terzić, Antonije Đorđević, Vladimir B. Pavlović, Dragan I. Olcan, Ljubiša Andrić, Nina Obradović |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Microstructure-final steatite ceramic materials Sintering MgO 02 engineering and technology Dielectric 01 natural sciences Crystallinity 0103 physical sciences Materials Chemistry Electron microscopy Electrical measurements Thermal stability Ceramic Composite material 010302 applied physics Process Chemistry and Technology Metallurgy 021001 nanoscience & nanotechnology Microstructure Insulators Surfaces Coatings and Films Electronic Optical and Magnetic Materials visual_art Dielectric properties Ceramics and Composites visual_art.visual_art_medium Dissipation factor 0210 nano-technology X-ray methods |
| Zdroj: | Ceramics International |
| Popis: | The focus of the study was on providing insights into interconnections between sintering and development of the crystalline microstructure, and consequently variations in dielectric behavior of four steatites fabricated from a low-cost raw material, i.e. talc. The changes, induced by the alternations of the binders (bentonite, kaolin clay) and fluxing agents (BaCO3, feldspar), were monitored in the temperature range 1000 degrees to 1250 degrees C in which complete densification and re-crystallization of the investigated structures were accomplished. The critical points in the synthesis of steatite materials were assessed by instrumental analyses. Crystallinity changes and mineral phase transition during sintering were monitored by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy accompanied with EDS mapping. The thermal stability was observed on the green mixtures using differential thermal and thermo gravimetric analyses. Electrical measurements recorded variations of the dielectric constant (epsilon(r)) and loss tangent (tan delta) as a function of the sintering temperature. The investigation highlighted critical design points, as well as the optimal combinations of the raw materials for production of the steatite ceramics for advanced electrical engineering applications. |
| Databáze: | OpenAIRE |
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