Refractory Ceramics of Clay and Alumina Waste
| Autor: | Hélio de Lucena Lira, Karina R. G. da Silva, Lisiane Navarro de Lima Santana, Gelmires de Araújo Neves, Valmir José da Silva, Salvador K. A. Taveira |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scanning electron microscope refractory ceramics Mullite 02 engineering and technology 01 natural sciences Thermal expansion alumina waste Phase (matter) 0103 physical sciences General Materials Science Ceramic Composite material Thermal analysis Materials of engineering and construction. Mechanics of materials 010302 applied physics Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Dwell time Mechanics of Materials visual_art TA401-492 visual_art.visual_art_medium Clays 0210 nano-technology Clay minerals |
| Zdroj: | Materials Research v.24 n.2 2021 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Volume: 24, Issue: 2, Article number: e20200485, Published: 05 FEB 2021 Materials Research, Vol 24, Iss 2 (2021) |
| ISSN: | 1980-5373 1516-1439 |
| DOI: | 10.1590/1980-5373-mr-2020-0485 |
| Popis: | Refractory ceramics were produced from clays and alumina waste. Specimens were shaped by uniaxial pressing, subjected to thermal analysis by dilatometry and heat-treated in a conventional furnace at 1300 and 1400ºC, applying a heating rate of 5ºC/min and a dwell time of 2 and 3 hours at the maximum temperature. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and physicomechanical properties. The dilatometric analysis before heat treatment indicated that the formulation containing the largest amount of fluxing oxides presented the highest linear shrinkage. The XRD analysis revealed that mullite was the major phase and needle shaped crystals typical of mullite obtained from clay minerals were observed by SEM. The increase in firing temperature and dwell time at the maximum temperature improved the physicomechanical properties of the specimens. The thermal expansion coefficient (TEC) in the range of 25 to 1000ºC varied from 6.2 to 6.9 x 10-6°C-1. |
| Databáze: | OpenAIRE |
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