Fabrication of High Porosity Mullite Foams and their Thermal Properties

Abstract:

Already, we developed a high porosity alumina foam. However, alumina has high thermal conductivity about 36W/mK at room temperature, and it need to achieve to high porosity to decrease thermal conductivity to for application of refractory bricks. Therefore, high porosity mullite refractory brick is developed using GS (Gelation of Slurry) method that is already developed for production of high porosity metal foam. Appling this method to production of mullite foams, the ceramics foams from 93 to 97% porosity can be produced. Also, their thermal conductivities are proportional to densities and obey to Ashby-Glicksman model. Its thermal conductivity is about 0.07W/mK when density is 0.1 g/cm3. The high porosity mullite foams achieved enough thermal insulating properties for refractory brick.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 1987-1991
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.1987
• Online since: November 2016
• Authors: Toru Shimizu*, Kunio Matsuzakaki
• Keywords: High Porosity, Mullite, Porous, Thermal Conductivity, Thermal Insulator

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