Fabrication of Mullite Ceramics With Ultrahigh Porosity by Gel Freeze Drying
書誌事項
- 公開日
- 2007-07
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1111/j.1551-2916.2007.01696.x
- 公開者
- Wiley
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説明
<jats:p> <jats:bold> Porous mullite (3Al <jats:sub>2</jats:sub> O <jats:sub>3</jats:sub> ·2SiO <jats:sub>2</jats:sub> ) ceramics with an open porosity up to 92.9% were fabricated by a gel freeze‐drying process. An alumina (Al <jats:sub>2</jats:sub> O <jats:sub>3</jats:sub> ) gel mixed with ultrafine silica (SiO <jats:sub>2</jats:sub> ) was frozen and sublimation of ice crystals was carried out by drying the frozen body under a low pressure. Porous mullite ceramics were prepared in air at 1400°–1600°C due to the mullitization between Al <jats:sub>2</jats:sub> O <jats:sub>3</jats:sub> and SiO <jats:sub>2</jats:sub> . A complex and porous microstructure was formed, where large dentritic pores with a pore size of ∼100 μm contained small cellular pores of 1–10 μm on their internal walls. Owing to the complete mullitization, a relatively high‐compressive strength of 1.52 MPa was obtained at an open porosity of 88.6%. </jats:bold> </jats:p>
収録刊行物
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- Journal of the American Ceramic Society
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Journal of the American Ceramic Society 90 (7), 2276-2279, 2007-07
Wiley