Fabrication and properties of porous anorthite/mullite ceramics with both high porosity and high strength |
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Authors: | Linghao Wu Cuiwei Li Jing Yang Hao Li |
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Affiliation: | School of Mechanical and Electronic Control Engineering, Beijing Jiao tong University, Beijing, PR. China |
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Abstract: | Porous anorthite/mullite ceramics with both high porosity and high strength have been successfully fabricated by foam-gelcasting and pressureless sintering technology, using α-Al2O3, SiO2, and CaCO3 as starting materials and MnO2 as sintering aids. The porous mullite ceramics prepared in this study had 83.3% porosity and 0.3 W/m·K thermal conductivity, exhibited compressive strength value as high as 6.1 MPa. The samples fabricated with mullite content of 30 mol% possessed 79.4% porosity and 5.9 MPa compressive strength showed thermal conductivity as low as 0.19 W/m·K. With the addition of MnO2, the properties of the prepared materials varied slightly when mullite content changed in a large scale. The results showed that the addition of MnO2 promoted the reaction, affected sintering and grain growth, and contributed to high strength and low-thermal conductivity. |
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Keywords: | anorthite compressive strength mullite porosity porous ceramics |
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