Fabrication and properties of porous mullite ceramics from calcined carbonaceous kaolin and α-Al2O3
Source abstract
Abstract
Abstract High purity calcined carbonaceous kaolin and α-Al 2 O 3 powders were employed to prepare porous mullite ceramics (Sample A) using graphite as pore former with the reaction sintering method. For the purpose of comparison, porous mullite ceramics (Sample B) was also fabricated from the uncalcined carbonaceous clay incorporated with α-Al 2 O 3 powders. Mullitization in the two samples was both nearly complete at 1500 °C, despite the fact that calcination of the clay remarkably depressed mullitization and promoted the formation of glass phase. The Sample A sintered at 1500 °C fractured mainly in an intergranular way, while the Sample B mainly underwent transgranular fracture. The experimental results revealed that densification behavior/open porosity of the Sample A was far more sensitive to sintering temperature. The pore size of the Sample A as well as the Sample B sintered at 1500 °C was in a narrower range of 0.3–5 μm.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Recycling and utilization of industrial and municipal waste in materials production · Advanced ceramic materials synthesis · Nuclear materials and radiation effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
Show source-provided references
1. Porous alumina as a support for catalysts and membranes. Preparation and study10.1007/BF02475683 ↗
2. Characterization of ceramic composite membrane filters for hot gas cleaning10.1016/S0032-5910(96)03246-9 ↗
3. The catalytic converter ceramic substrate—an astonishing and enduring invention
4. Thermal expansion of mullite10.1111/j.1151-2916.1990.tb05270.x ↗
5. Phase transformation and growth of mullite in kaolin ceramics10.1016/S0955-2219(03)00631-9 ↗
6. Fabrication of mullite ceramics with ultra high porosity by gel freeze drying10.1111/j.1551-2916.2007.01696.x ↗
7. Porous mullite ceramics with high strength10.1023/A:1021576104859 ↗
8. Review of mullite synthesis routes in Japan
9. Influence of raw material type and of the overall chemical composition on phase formation and sintered microstructure of mullite aggregates10.1016/j.ceramint.2008.11.008 ↗
10. Porous mullite ceramics from national clay produced by gel casting10.1016/S0272-8842(00)00034-1 ↗
11. Porous mullite and mullite-based composites by chemical processing of kaolinite and aluminum metal wastes10.1039/a909380j ↗
12. Preparation of mullite ceramics from coprecipitated aluminum hydroxide and kaolinite using hexamethylenediamine10.1111/j.1151-2916.2000.tb01614.x ↗
13. Direct preparation of macroporous mullite supports for membranes by in situ reaction sintering10.1016/j.memsci.2008.01.034 ↗
14. Contribution to porous mullite synthesis from clays by adding Al and Mg powders10.1016/j.jeurceramsoc.2008.05.036 ↗
15. Preparation of bimodal porous mullite ceramics10.1007/BF00975068 ↗
16. Structure and characteristics of modified coal shale filler used as NR fillings (in Chinese)10.1007/s10409-009-0293-z ↗
17. Porcelain—raw materials, processing, phase evolution, and mechanical behavior10.1111/j.1151-2916.1998.tb02290.x ↗
18. The kaolinite–mullite reaction series. III. The high-temperature phases10.1111/j.1151-2916.1959.tb14316.x ↗
19. Kinetics of dehydroxylation of kaolinite and halloysite10.1111/j.1151-2916.1957.tb12549.x ↗
20. Time–temperature–transformation curves for kaolinite–alumina10.1111/j.1151-2916.1994.tb09755.x ↗
21. Microstructural evolution of mullite during the sintering of kaolin powder compacts10.1016/S0272-8842(00)00009-2 ↗
22. Diffusion and reaction studies in the system Al2O3–SiO210.1111/j.1151-2916.1972.tb13421.x ↗
23. Mullite formation in kaolinite–α-alumina10.1016/0956-7151(94)90503-7 ↗