Utilization of sepiolite in the synthesis of porous cordierite ceramics

Porous cordierite ceramics were prepared using sepiolite source of MgO and SiO 2 and alumina as starting materials by simple dry-pressing/sintering. The sepiolite/alumina green bodies were sintered at 1100–1350 °C for 2 h. The characterization was focused on thermal analysis, phase evolution, sinter...

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Bibliographic Details
Published in:Applied clay science 2011-05, Vol.52 (3), p.328-332
Main Authors: Zhou, Jian-er, Dong, Yingchao, Hampshire, Stuart, Meng, Guangyao
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Ceramics
Clay (material)
Cordierite
Earth sciences
Earth, ocean, space
Exact sciences and technology
Mineralogy
Porous cordierite
Sepiolite
Silicates
Sintering
Sintering (powder metallurgy)
Thermal analysis
Thermal expansion
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Summary:Porous cordierite ceramics were prepared using sepiolite source of MgO and SiO 2 and alumina as starting materials by simple dry-pressing/sintering. The sepiolite/alumina green bodies were sintered at 1100–1350 °C for 2 h. The characterization was focused on thermal analysis, phase evolution, sintering behavior, thermal expansion and micro-structural changes using DSC/TG, XRD, dilatometry and SEM. α-Cordierite was formed above 1200 °C, the amount of which increased steadily with the sintering temperature. Increasing sintering temperature also improved the densification (especially above1000 °C), and decreased the thermal expansion (especially above 1200 °C). Porous cordierite with a bimodal pore size distribution (1.4–1.9 μm and 10 μm) was prepared with cornstarch as pore-former.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2011.02.001