3D Interconnetive Porous Silica Ceramics Prepared by Gel Casting with Egg White Protein as a Foaming Agent

Abstract:

Highly porous silica ceramics were produced by gel casting with egg white protein (EWP) as a foaming agent and evaluated by measuring the porosity, mechanical strength and microstructure. After drying, the green bodies were debindered and sintered at 1300°C for 4 h. The influences of the EWP content on the open porosity as well as the strength were investigated. The porosity of the obtained porous silica ceramics was within 70.2%-86.1%, the bending strength decreased from 6.81 MPa to 5.48 MPa. It was found that the strength dependence of the porosity was well described by a modified exponential relation of the form σ=σ0exp(-BP), where P is the porosity and B is a constant (B = 1.37 was obtained by fitting the experimental data). This finding is in agreement with other literature data and seems to indicate a common feature of all porous ceramics.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 555-558
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.555
• Online since: June 2012
• Authors: Hai Xu, Jia Chen Liu, Ying Na Zhao, Zhen Guang Hou
• Keywords: Direct Protein Foaming, Egg White Protein, Porous Ceramics, Silica

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