Preparation of Macroporous Ceramics Using Agar Gelcasting Foam Method

Qun Cai; Feng Rui Zhai; Jun Sheng Li

doi:10.4028/www.scientific.net/AMR.624.84

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 624Preparation of Macroporous Ceramics Using Agar...

Preparation of Macroporous Ceramics Using Agar Gelcasting Foam Method

Abstract:

Gel casting foam is a novel method which was developed in latter 1990s for the fabrication of porous materials with regular round pores and a relatively high flexural strength. It also has the advantages of simplicity in degreasing processing and short production cycle. However, the gelating system used in this method commonly contains acrylatnide, which is toxic and sensitive to oxygen, due to which, foaming and polymerization of the substance have to be performed in an oxygen-free environment. In this work, we use agar as the gelating agent in replace of acrylatnide to prepare alumina macroporous ceramics. The effects of foaming speed, foaming time, gelating time and valeric acid on the pore diameter of the sample were investigated. Results show that the average pore diameter increasing with the foaming speed, but decreasing with the increasing foaming time. Moreover, the addition of valeric acid reduces the bubble size during foaming and increase the stability of the foams. By controlling the foaming and gelating conditions, we achieve alumina macroporous ceramics with regular round pores of over 100μm by this method.

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Periodical:

Advanced Materials Research (Volume 624)

Pages:

84-87

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.624.84

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Online since:

December 2012

Authors:

Qun Cai, Feng Rui Zhai, Jun Sheng Li

Keywords:

Agar Gel, Direct Foaming, Gelcasing Foam Method, Valeric Acid

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