Research the Performance of Alumina Insulation Material by Freeze-Drying

Abstract:

The traditional method of preparation alumina insulation material includes the addition of pore-forming agent, direct foaming, foam impregnation and gel-casting. In this experiment, α-alumina as raw material, silica fume as an additive, Combination freeze-drying method, add pore-forming agent and direct foaming successfully prepared low-density, high strength, low thermal conductivity of alumina insulation material. Change the particle size of pore-forming agent can be get different properties of the sample. The SEM photograph was clearly observed that the hole wall dense uniform, α-alumina particles sufficient contact, no significant ice sublimation hole left. There are also the reasons of the sample with higher value of bending strength and compressive strength. This can make a control of porosity, as well as pore size, pore shape and pores space topology of alumina insulation material.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 527-530
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.527
• Online since: June 2012
• Authors: Dao Yuan Yang, Guang Hui Wei
• Keywords: Freeze-Drying, Porous Alumina, Thermal Conductivity (TC)

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