Effects of firing temperature on the microstructures and properties of porous mullite ceramics prepared by foam-gelcasting
| Autor: | Shangkun Zhang, Wanguo Zhao, Haijun Zhang, Junkai Wang, Zhong Huang, Jianghao Liu, Xiangong Deng |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Sintering Foaming agent Mullite 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Industrial and Manufacturing Engineering Carboxymethyl cellulose Flexural strength visual_art 0103 physical sciences Ceramics and Composites medicine visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology Porosity medicine.drug |
| Zdroj: | Advances in Applied Ceramics. 115:204-209 |
| ISSN: | 1743-6761 1743-6753 |
| DOI: | 10.1080/17436753.2015.1116820 |
| Popis: | Porous mullite ceramics were prepared at 1300–1600°C for 2 h via a foam-gelcasting route using industrial-grade mullite powders as the main raw material, Isobam 104 as the dispersing and gelling agent, triethanolamine lauryl sulphate as the foaming agent and sodium carboxymethyl cellulose as the foam stabilising agent. The effects of firing temperature on the sintering behaviour of green samples as well as microstructures and properties of final porous mullite products were investigated. With increasing the temperature from 1300 to 1600°C, linear shrinkage and bulk density values of fired samples increased, whereas their porosity decreased. Mechanical strength and thermal conductivity values of fired samples decreased with increasing their porosities. Even at a porosity level as high as 79.4%, compressive and flexural strengths of fired samples (with average pore size of 314 μm) remained as high as 9.0 and 3.7 MPa, respectively, and their thermal conductivity (at 200°C) remained as low as 0.21 W (m−1 K−1). |
| Databáze: | OpenAIRE |
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