Ceramics-Silikáty 55, (1) 1 - 7 (2011) |
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GEL CASTING OF ALUMINA CERAMICS USING AN EGG WHITE PROTEIN BINDER SYSTEM
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He Xing 1, Su Bo 2, Zhou Xingui 3,
Yang Junhe 1,
Zhao Bin 1,
Wang Xianzing 1,
Yang Guangzhi 1,
Tang Zhihong 1,
Qiu Hanxun 1
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1 School of Materials Science and Engineering,
University of Shanghai for Science and Technology, Shanghai, 200093, China
2 Department of Oral & Dental Science,
University of Bristol, Lower Maudlin Street, Bristol, BS1 2LY, UK
3 Key Lab of Advanced Ceramic Fibers & Composites,
National University of Defense Technology, Hunan, Changsha, 410073, China
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Keywords: Alumina, Egg white protein, Dense ceramics, Gelcasting
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Egg white protein (EW) is a food ingredient commonly used for its gelling properties and has been applied in ceramic
fabrication. In this work, EW was used as an environmentally-friendly binder for gelcasting alumina ceramics at elevated
temperature (80°C). The gelling behavior was compared with the ambient temperature drying-induced gelation processing.
The processing conditions and mechanical properties of the ceramics processed from two different processing variants were
compared. The results indicate that the ceramics from heat-induced gelation showed improved mechanical properties and
more uniform microstructure after sintering in comparison to the drying-induced ones. Dense and complex-shaped ceramic
parts via computer numerical controlled (CNC) green machining have been produced from the EW gelcast ceramics. |
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