Open Access Fabrication of Lamellar Alumina Porous Ceramic by Freeze Drying with Applied Electrostatic Field

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Abstract:

Lamellar porous alumina ceramics were prepared via directional freezing of aqueous slurries in an applied electrostatic field, vacuum drying and sintering at 1 500 for 3 h. The pore morphology, pore size and pore distribution of the ceramics were characterized. The effects of the direction and intensity of the electrostatic field on crystallization of the solvent and distribution of alumina particles were investigated. The results show that the crystallization behavior of water and the distribution of alumina particles were changed through directional freezing of the slurries in an applied electrostatic field. When electrostatic field was consistent with the freezing direction, the bridging number between the lamellar channels of porous alumina were reduced with the increase of electrostatic field intensity. The pore channel of porous alumina becomes a lamellar structure when the electrostatic field intensity is 100 kV/m. The direction of lamellar pore channel deflects from the freezing direction to the electrostatic field when the electrostatic field is vertical to the freezing direction. The deflection angle increases with increasing the electrostatic field intensity. The average lamellar spacing of the porous alumina increases due to the inhibition of electrostatic field on the ice thickness and the hindering on alumina particle motion. The average lamellar spacing of the porous alumina decreases, the lamellar channel deflection angle unchanges and the uniformity of lamellar channels declines with the increase of alumina volume content.

Keywords: alumina; electrostatic field; freeze drying; pore morphology; solvent crystallization behavior

Document Type: Research Article

DOI: http://dx.doi.org/10.7521/j.issn.0454-5648.2013.12.02

Affiliations: School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China

Publication date: December 1, 2013

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  • Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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