Nano-Porous Alumina Ceramic with a Water-Soluble Copolymer by Alcohol-Water Based Gel-Casting Process

作者：Hu Shujuan^*; Zhang Yue; Tang Baojun

来源：Rare Metal Materials and Engineering, 2015, 44: 400-403.

• alumina
• copolymer
• gel-casting
• nano-porous ceramic

Using high purity alumina powder as raw material, tertiary butanol-water mixture as solvent, copolymer Isobam as dispersant and cross-linking agent, nano-porous alumina ceramics with Porosity ranged from 80% to 85% were fabricated by gel-casting process. The effect of Isobam concentration on rheological behavior of the slurries, the porosity, mechanical property and heat-insulating property of nano-porous alumina ceramics were investigated. The results show that the slurry with low viscosity and high stability can be prepared by adding 0.8wt % Isobam under the circumstance of optimum volume ratio of the solvent (V-TBA:V-H2O=3:7). The nano-pores alumina ceramics with the highest porosity (>85%) can be obtained after sintering the molding body at 1000 degrees C for 1 h. The sizes of the porous are uniformly distributed within nanoscale, the thermal conductivity of the ceramics is 0.06W.(m.K)(-1), and after sintering at 1350 degrees C for 1 h, the porosity retention rate of the ceramics is 94.72%.

• 出版日期2015-11
• 单位北京航空航天大学