Transient liquid phase diffusion process for porous mullite ceramics with excellent mechanical properties
| Autor: | Fei Zhao, Jinxing Gao, Xinhong Liu, Tiezhu Ge, Liugang Chen |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Diffusion Sintering Mullite Corundum 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Compressive strength visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium engineering Ceramic Composite material 0210 nano-technology Porosity |
| Zdroj: | Ceramics International. 44:19123-19130 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.06.114 |
| Popis: | Porous mullite ceramics were fabricated by the transient liquid phase diffusion process, using quartz and fly-ash floating bead (FABA) particles and corundum fines as starting materials. The effects of sintering temperatures on the evolution of phase composition and microstructure, linear shrinkage, porosity and compressive strength of ceramics were investigated. It is found that a large amount of quartz and FABA particles can be transformed into SiO2-rich liquid phase during the sintering process, and the liquid phase is transient in the Al2O3-SiO2 system, which can accelerate the mullitization rate and promote the growth of mullite grains. A large number of closed pores in the mullite ceramics are formed due to the transient liquid phase diffusion at elevated temperatures. The porous mullite ceramics with high closed porosity (about 30%) and excellent compressive strength (maximum 105 MPa) have been obtained after fried at 1700 °C. |
| Databáze: | OpenAIRE |
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