Effect of reduced Al2O3 mole ratio on fabrication of cordierite ceramic by solid-state sintering method
Cordierite ceramic was fabricated by reducing Al2O3 mole ratio from 2.0 to 1.4 with kaolin, silicon dioxide and magnesium oxide as the raw materials. The effect of reduced Al2O3 mole ratio on the sintering behaviors, phase transition, main properties, and microstructure were characterized i...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
International Institute for the Science of Sintering, Beograd
2019-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2019/0350-820X1902189L.pdf |
| Summary: | Cordierite ceramic was fabricated by reducing Al2O3 mole ratio from 2.0 to
1.4 with kaolin, silicon dioxide and magnesium oxide as the raw materials.
The effect of reduced Al2O3 mole ratio on the sintering behaviors, phase
transition, main properties, and microstructure were characterized in
detail. The results show that cordierite phase becomes the main
crystallization phase at 1300°C, and mullite phase can be consumed to
produce cordierite phase by reducing Al2O3 mole ratio. But additional quartz
phase still exists until 1400°C. Moreover, the open porosity, pore
connectivity and pore size increase as Al2O3 mole ratio reduces from 2.0 to
1.4 while the linear shrinkage percent and bulk density decrease with the
reduced Al2O3. It is considered that the sintering activity of the raw
materials at low temperature decreases due to the increase of chemically
pure magnesium oxide and silica with the decrease of Al2O3 mole ratio, while
the crystallization process, pore growth and cordierite phase rather than
the liquid phase control the densification process at high temperature. |
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| ISSN: | 0350-820X 1820-7413 |