Impact of spark plasma sintering (SPS) on mullite formation in porcelains
| Autor: | Doni Daniel Jayaseelan, Salvatore Grasso, Ayan Bhowmik, Wirat Lerdprom, Michael J. Reece, Eugenio Zapata-Solvas, William E. Lee |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Metallurgy Spark plasma sintering Sintering Crystal growth Mullite 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Dwell time Tetragonal crystal system 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology |
| Zdroj: | Journal of the American Ceramic Society. 101:525-535 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.15213 |
| Popis: | The effect of the spark plasma sintering (SPS) process on mullite formation in porcelains was studied using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. SPS affected the kinetics and morphology of formed mullite. After sintering at 1100°C, unlike conventional sintering, SPS promoted the formation of mullite due to the combination of vacuum and applied pressure. Mullite crystal growth was altered by the atmosphere (vacuum), dwell time (0-15 mins), and temperature (1000-1200°C). The applied pressure caused the mullite needles to orient perpendicular to the direction of the applied load. Depending on SPS dwell time, the mullite formed after sintering at 1100°C also had different crystal structure (tetragonal for short dwell time of 0-5min and orthorhombic for a long dwell time of 10-15min). Dissolution of mullite was observed at 1100°C by extending the dwell time by up to 15 minutes and the dissolved mullite re-precipitated on the small needles (~40nm) via Oswald ripening resulting in larger mullite needles (~60nm). This article is protected by copyright. All rights reserved. |
| Databáze: | OpenAIRE |
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