A new Al2O3 porous ceramic prepared by addition of hollow spheres |
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| Authors: | Zhenguo Su Xiaoqing Xi Yanjun Hu Qi Fei Shicheng Yu Hui Li Jinlong Yang |
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| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
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| Abstract: | A method for making porous ceramic prepared by adding hollow spheres was developed, and the resulting porous ceramic was named as hollow spheres ceramic. Water soluble epoxy resin was used as a gel former in the gelcasting process of the Al2O3 hollow sphere and Al2O3 powder, the porous ceramic porosity varies from 22.3 to 60.1 %. The influence of amount of Al2O3 hollow sphere and sintering temperature on the microstructure, compressive strength and thermal conductivity were investigated. With an increasing amount of hollow sphere in the matrix, the porosity increases, which leads to decreased bulk density, compressive strength and thermal conductivity. The compressive strength of the porous ceramics has a power law relation with the porosity, and the calculated power law index is 4.5. The equations of the relationship between porosity and thermal conductivity of porous ceramics are proposed. The thermal conductivity of samples with 60.1 % porosity is as low as 2.1 W/m k at room temperature. |
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